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Fair Oaks Bridge

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The Fair Oaks Bridge is a truss bridge over the lower banks of the American River , connecting Fair Oaks to the greater Sacramento, California region. The current bridge , built 1907-1909 at a cost of $ 63,000, is the third bridge at this location.

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100-414: The first bridge, which opened in 1901, helped to transform the small semi-rural community into a turn-of-the-century agricultural powerhouse. The present bridge, built 1907-1909, helped to transform the citrus colony into one of the leading bedroom communities of Sacramento by the 1940s. It is now a pedestrian and bicycle-only bridge. Brevet Brigadier General Charles Henry Howard and James W. Wilson of

200-466: A Parker truss or Pratt truss than a true arch . In the Brown truss all vertical elements are under tension, with exception of the end posts. This type of truss is particularly suited for timber structures that use iron rods as tension members. See Lenticular truss below. This combines an arch with a truss to form a structure both strong and rigid. Most trusses have the lower chord under tension and

300-544: A Parker truss vary from near vertical in the center of the span to diagonal near each end, similar to a Warren truss. George H. Pegram , while the chief engineer of Edge Moor Iron Company in Wilmington, Delaware , patented this truss design in 1885. The Pegram truss consists of a Parker type design with the vertical posts leaning towards the center at an angle between 60 and 75°. The variable post angle and constant chord length allowed steel in existing bridges to be recycled into

400-576: A common truss design during this time, with their arched top chords. Companies like the Massillon Bridge Company of Massillon, Ohio , and the King Bridge Company of Cleveland , became well-known, as they marketed their designs to cities and townships. The bowstring truss design fell out of favor due to a lack of durability, and gave way to the Pratt truss design, which was stronger. Again,

500-435: A conventional truss into place or by building it in place using a "traveling support". In another method of construction, one outboard half of each balanced truss is built upon temporary falsework. When the outboard halves are completed and anchored the inboard halves may then be constructed and the center section completed as described above. The Fink truss was designed by Albert Fink of Germany in 1854. This type of bridge

600-595: A cultural icon for the local community. On September 25, 2006, the keeper of the National Register of Historic Places listed the Old Fair Oaks Bridge as a National Historic Site. The bridge successfully listed under the Register's criterion A (associative history) and C (architectural significance). While not meant to be an exhaustive list, see the following sources for more on the history of Fair Oaks, including

700-602: A flood in March 1907. An 850-foot steel cable was then borrowed from the Folsom Development Company to use with a ferry boat across the river. The Sacramento County Board of Supervisors also authorized the construction of a temporary bridge. Actually, Myrtle Shaw Lord, in his officially sanctioned history of the Chamber of Commerce, A Sacramento Saga: Fifty Years of Achievement—Chamber of Commerce Leadership , writes that after

800-455: A high quantity of citric acid , which with other organic acids including ascorbic acid (vitamin C) give them their characteristic sharp taste. Citrus fruits are diverse in size and shape, as well as in color and flavor, reflecting their biochemistry; for instance, grapefruit is made bitter-tasting by a flavanone, naringin . Most commercial citrus cultivation uses trees produced by grafting

900-471: A limited number of truss bridges were built. The truss may carry its roadbed on top, in the middle, or at the bottom of the truss. Bridges with the roadbed at the top or the bottom are the most common as this allows both the top and bottom to be stiffened, forming a box truss . When the roadbed is atop the truss, it is a deck truss; an example of this was the I-35W Mississippi River bridge . When

1000-576: A linear furanocoumarin derived from psoralen . This claim has been confirmed for lime and bergamot . In particular, bergamot essential oil has a higher concentration of bergapten (3–3.6 g/kg) than any other Citrus -based essential oil. A systematic review indicates that citrus fruit consumption is associated with a 10% reduction of risk for developing breast cancer. Many citrus fruits, such as oranges , tangerines , grapefruits , and clementines , are generally eaten fresh. They are typically peeled and can be easily split into segments. Grapefruit

1100-477: A lower chord (functioning as a suspension cable) that curves down and then up to meet at the same end points. Where the arches extend above and below the roadbed, it is called a lenticular pony truss bridge . The Pauli truss bridge is a specific variant of the lenticular truss, but the terms are not interchangeable. One type of lenticular truss consists of arcuate upper compression chords and lower eyebar chain tension links. Brunel 's Royal Albert Bridge over

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1200-556: A national depression hitting in 1893. Many of the purchasers were professionals and other friends of the investors. Thus, the Fair Oaks community became initially composed of mostly businessmen and other professionals, including bankers and engineers. Three hundred permanent settlers resided in Fair Oaks by 1897 and bought land in 5, 10, and 20-acre (8.1 ha) tracts at an average of $ 30 per acre. These pioneers planned to sustain themselves by planting and cultivating fruit orchards although

1300-760: A new span using the Pegram truss design. This design also facilitated reassembly and permitted a bridge to be adjusted to fit different span lengths. There are twelve known remaining Pegram span bridges in the United States with seven in Idaho , two in Kansas , and one each in California , Washington , and Utah . The Pennsylvania (Petit) truss is a variation on the Pratt truss . The Pratt truss includes braced diagonal members in all panels;

1400-459: A pin-jointed structure, one where the only forces on the truss members are tension or compression, not bending. This is used in the teaching of statics, by the building of model bridges from spaghetti . Spaghetti is brittle and although it can carry a modest tension force, it breaks easily if bent. A model spaghetti bridge thus demonstrates the use of a truss structure to produce a usefully strong complete structure from individually weak elements. In

1500-491: A small number of core ancestral species, including the citron, pomelo, and mandarin. Natural and cultivated citrus hybrids include commercially important fruit such as oranges, grapefruit , lemons, limes, and some tangerines . The multiple hybridisations have made the taxonomy of Citrus complex. Apart from these core species, Australian limes and the recently discovered mangshanyegan are grown. Kumquats and Clymenia spp. are now generally considered to belong within

1600-532: A variant of the lenticular truss, "with the top chord carefully shaped so that it has a constant force along the entire length of the truss." It is named after Friedrich Augustus von Pauli  [ de ] , whose 1857 railway bridge (the Großhesseloher Brücke  [ de ] ) spanned the Isar near Munich . ( See also Grosshesselohe Isartal station .) The term Pauli truss is not interchangeable with

1700-460: A wasp on one of the fruits. The impressionist Edouard Manet depicted a lemon on a pewter plate. In modern art, Arshile Gorky painted Still Life with Lemons in the 1930s. Citrus fruits "were the clear status symbols of the nobility in the ancient Mediterranean", according to the paleoethnobotanist Dafna Langgut. In Louisa May Alcott 's 1868 novel Little Women , the character Amy March states that "It's nothing but limes now, for everyone

1800-455: A wide range of appearance and fruit flavors. The large citrus fruit of today evolved originally from small, edible berries over millions of years. Citrus species began to diverge from a common ancestor about 15 million years ago, at about the same time that Severinia (such as the Chinese box orange ) diverged from the same ancestor. About 7 million years ago, the ancestors of Citrus split into

1900-485: Is a genus of flowering trees and shrubs in the family Rutaceae . Plants in the genus produce citrus fruits , including important crops such as oranges , mandarins , lemons , grapefruits , pomelos , and limes . Citrus is native to South Asia, East Asia, Southeast Asia, Melanesia , and Australia. Indigenous people in these areas have used and domesticated various species since ancient times. Its cultivation first spread into Micronesia and Polynesia through

2000-677: Is a Pratt truss design with a polygonal upper chord. A "camelback" is a subset of the Parker type, where the upper chord consists of exactly five segments. An example of a Parker truss is the Traffic Bridge in Saskatoon , Canada. An example of a camelback truss is the Woolsey Bridge near Woolsey, Arkansas . Designed and patented in 1872 by Reuben Partridge , after local bridge designs proved ineffective against road traffic and heavy rains. It became

2100-507: Is a hybrid between a Warren truss and a double-intersection Pratt truss. Invented in 1863 by Simeon S. Post, it is occasionally referred to as a Post patent truss although he never received a patent for it. The Ponakin Bridge and the Bell Ford Bridge are two examples of this truss. A Pratt truss includes vertical members and diagonals that slope down towards the center, the opposite of

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2200-477: Is more commonly halved and eaten out of the skin with a spoon. Lemonade is a popular beverage prepared by diluting the juice and adding sugar. Lemon juice is mixed in salad dressings and squeezed over fruit salad to stop it from turning brown: its acidity suppresses oxidation by polyphenol oxidase enzymes. A variety of flavours can be derived from different parts and treatments of citrus fruits. The colourful outer skin of some citrus fruits, known as zest ,

2300-798: Is named after the K formed in each panel by the vertical member and two oblique members. Examples include the Südbrücke rail bridge over the River Rhine, Mainz, Germany, the bridge on I-895 (Baltimore Harbor Tunnel Thruway) in Baltimore, Maryland, the Long–Allen Bridge in Morgan City, Louisiana (Morgan City Bridge) with three 600-foot-long spans, and the Wax Lake Outlet bridge in Calumet, Louisiana One of

2400-507: Is partly based on the Howe truss . The first Allan truss was completed on 13 August 1894 over Glennies Creek at Camberwell, New South Wales and the last Allan truss bridge was built over Mill Creek near Wisemans Ferry in 1929. Completed in March 1895, the Tharwa Bridge located at Tharwa, Australian Capital Territory , was the second Allan truss bridge to be built, the oldest surviving bridge in

2500-671: Is practical for use with spans up to 250 feet (76 m) and was a common configuration for railroad bridges as truss bridges moved from wood to metal. They are statically determinate bridges, which lend themselves well to long spans. They were common in the United States between 1844 and the early 20th century. Examples of Pratt truss bridges are the Governor's Bridge in Maryland ; the Hayden RR Bridge in Springfield, Oregon , built in 1882;

2600-457: Is required where rigid joints impose significant bending loads upon the elements, as in a Vierendeel truss . In the bridge illustrated in the infobox at the top, vertical members are in tension, lower horizontal members in tension, shear , and bending, outer diagonal and top members are in compression, while the inner diagonals are in tension. The central vertical member stabilizes the upper compression member, preventing it from buckling . If

2700-676: Is sucking them in their desks in schooltime, and trading them off for pencils, bead rings, paper dolls, or something else… If one girl likes another, she gives her a lime; if she’s mad with her, she eats one before her face, and doesn’t offer even a suck." Truss bridge A truss bridge is a bridge whose load-bearing superstructure is composed of a truss , a structure of connected elements, usually forming triangular units. The connected elements, typically straight, may be stressed from tension , compression , or sometimes both in response to dynamic loads. There are several types of truss bridges, including some with simple designs that were among

2800-407: Is supported only at the ends and is fully independent of any adjacent spans. Each span must fully support the weight of any vehicles traveling over it (the live load ). In contrast, a continuous truss functions as a single rigid structure over multiple supports. This means that the live load on one span is partially supported by the other spans, and consequently it is possible to use less material in

2900-513: Is the Victoria Bridge on Prince Street, Picton, New South Wales . Also constructed of ironbark, the bridge is still in use today for pedestrian and light traffic. The Bailey truss was designed by the British in 1940–1941 for military uses during World War II. A short selection of prefabricated modular components could be easily and speedily combined on land in various configurations to adapt to

3000-567: Is used as a flavouring in cooking. The whole of the bitter orange (and sometimes other citrus fruits) including the peel with its essential oils is cooked with sugar to make marmalade . By the 17th century, orangeries were added to great houses in Europe, both to enable the fruit to be grown locally and for prestige, as seen in the Versailles Orangerie . Some modern hobbyists grow dwarf citrus in containers or greenhouses in areas where

3100-736: The Australian Capital Territory and the oldest, longest continuously used Allan truss bridge. Completed in November 1895, the Hampden Bridge in Wagga Wagga, New South Wales , Australia, the first of the Allan truss bridges with overhead bracing, was originally designed as a steel bridge but was constructed with timber to reduce cost. In his design, Allan used Australian ironbark for its strength. A similar bridge also designed by Percy Allen

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3200-674: The Austronesian expansion ( c.  3000 –1500 BCE). Later, it was spread to the Middle East and the Mediterranean ( c.  1200 BCE ) via the incense trade route , and from Europe to the Americas. Renowned for their highly fragrant aromas and complex flavor, citrus are among the most popular fruits in cultivation. With a propensity to hybridize between species, making their taxonomy complicated, there are numerous varieties encompassing

3300-597: The Dearborn River High Bridge near Augusta, Montana, built in 1897; and the Fair Oaks Bridge in Fair Oaks, California , built 1907–09. The Scenic Bridge near Tarkio, Montana , is an example of a Pratt deck truss bridge, where the roadway is on top of the truss. The queenpost truss , sometimes called "queen post" or queenspost, is similar to a king post truss in that the outer supports are angled towards

3400-1224: The Fort Wayne Street Bridge in Goshen, Indiana , the Schell Bridge in Northfield, Massachusetts , the Inclined Plane Bridge in Johnstown, Pennsylvania , the Easton–Phillipsburg Toll Bridge in Easton, Pennsylvania , the Connecticut River Bridge in Brattleboro, Vermont , the Metropolis Bridge in Metropolis, Illinois , and the Healdsburg Memorial Bridge in Healdsburg, California . A Post truss

3500-445: The Howe truss . The interior diagonals are under tension under balanced loading and vertical elements under compression. If pure tension elements (such as eyebars ) are used in the diagonals, then crossing elements may be needed near the center to accept concentrated live loads as they traverse the span. It can be subdivided, creating Y- and K-shaped patterns. The Pratt truss was invented in 1844 by Thomas and Caleb Pratt. This truss

3600-707: The Philippines . This was followed by the spread of citrus species into Taiwan and Japan in the Early Pliocene (5.33 to 3.6 mya ), resulting in the tachibana orange ( C. tachibana ); and beyond the Wallace Line into Papua New Guinea and Australia during the Early Pleistocene (2.5 million to 800,000 years ago), where further speciation events created in the Australian limes . A fossil leaf from

3700-623: The Pliocene of Valdarno , Italy is described as † Citrus meletensis . In China, fossil leaf specimens of † Citrus linczangensis have been collected from late Miocene coal-bearing strata of the Bangmai Formation in Yunnan province. C. linczangensis resembles C. meletensis in having an intramarginal vein, an entire margin, and an articulated and distinctly winged petiole . Many cultivated Citrus species are natural or artificial hybrids of

3800-475: The River Tamar between Devon and Cornwall uses a single tubular upper chord. As the horizontal tension and compression forces are balanced these horizontal forces are not transferred to the supporting pylons (as is the case with most arch types). This in turn enables the truss to be fabricated on the ground and then to be raised by jacking as supporting masonry pylons are constructed. This truss has been used in

3900-492: The United States , because wood was in abundance, early truss bridges would typically use carefully fitted timbers for members taking compression and iron rods for tension members , usually constructed as a covered bridge to protect the structure. In 1820, a simple form of truss, Town's lattice truss , was patented, and had the advantage of requiring neither high labor skills nor much metal. Few iron truss bridges were built in

4000-665: The citron ( C. medica ) or a conifer tree ( Thuja ). The Latin word is related to the ancient Greek word for the cedar of Lebanon , κέδρος ( kédros ), perhaps from a perceived similarity of the smell of citrus leaves and fruit with that of cedar. Citrus plants are large shrubs or small to moderate-sized trees, reaching 5–15 m (16–49 ft) tall, with spiny shoots and alternately arranged evergreen leaves with an entire margin. The flowers are solitary or in small corymbs , each flower 2–4 cm (0.79–1.57 in) diameter, with five (rarely four) white petals and numerous stamens; they are often very strongly scented, due to

4100-421: The citrons ( Citrus medica ) of South Asia; the pomelos ( C. maxima ) of Mainland Southeast Asia ; the mandarins ( C. reticulata ), kumquats ( C. japonica ), mangshanyegan ( C. mangshanensis ), and ichang papedas ( C. cavaleriei ) of southeastern China; the kaffir limes ( C. hystrix ) of Island Southeast Asia ; and the biasong and samuyao ( C. micrantha ) of

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4200-592: The "crown of the [Sacramento] valley", in the "heart of California". Together, in 1901, these two groups convinced the County of Sacramento's Chamber of Commerce, which McClatchy's business partners from Orangevale created and chaired, to build a bridge across the American River at Fair Oaks and persuaded the Southern Pacific Rail Road Company to build a railroad spur to the bridge. In the summer of 1901

4300-511: The 1880s. It retained the light metal diagonals but substituted heavier metal beams, posts, and chords for the wooden members. The most common Pratt type is the through truss in which the deck is carried on the lower chord, with overhead lateral supports connecting the top chords. Finally, the Pennsylvania Petit is a Pratt truss with a polygonal top chord and includes reinforcing sub-struts and sub-ties. These half-length members reinforced

4400-474: The American Parkway Trail along the lower banks of the American River. The Fair Oaks Bridge is an excellent example of bridge construction and technology advancement in the mid- to late 19th century. It is a Pennsylvania Petit through Pratt truss bridge that extends nearly 500 feet (150 m) across a wide bend in the American River and is the second oldest out of ten surviving bridges of this type in

4500-666: The American River and railroad service from Sacramento. Businessmen in Chicago and Sacramento who had an investment (land or fruit) in the newborn colony and Orangevale formed the Chicago-Fair Oaks Club in 1899. Local businessmen, including Valentine S. McClatchy (the co-owner of the Sacramento Bee ), incorporated the Fair Oaks Development Company in 1900. These boosters shamelessly proclaimed Fair Oaks to be

4600-579: The Howard-Wilson Publishing Company of Chicago acquired rights to sell land from California Senator Frederick K. Cox and businessman Crawford W. Clarke in 1895. The Howard-Wilson Company had the land surveyed and mapped and began to promote Fair Oaks as one of their "Sunset Colonies". The Howard-Wilson Company advertised Fair Oaks as an innovative and growing citrus colony after destructive freezes in Southern California and Florida and

4700-643: The Mediterranean by Arab traders around the 10th century CE. Sweet oranges were brought to Europe by the Genoese and Portuguese from Asia during the 15th to 16th century. Mandarins were not introduced until the 19th century. Oranges were introduced to Florida by Spanish colonists. In cooler parts of Europe, citrus fruit was grown in orangeries starting in the 17th century; many were as much status symbols as functional agricultural structures. The generic name Citrus originates from Latin , where it denoted either

4800-656: The Pennsylvania truss adds to this design half-length struts or ties in the top, bottom, or both parts of the panels. It is named after the Pennsylvania Railroad , which pioneered this design. It was once used for hundreds of bridges in the United States, but fell out of favor in the 1930s and very few examples of this design remain. Examples of this truss type include the Lower Trenton Bridge in Trenton, New Jersey ,

4900-411: The Pratt and Warren trusses, facilitated the enormous expansion of railroad lines in the late 19th century and were instrumental in turn-of-the-century highway construction as well. The trusses form vertical sides to the bridge, connected to one another by traverse beams, and by stingers and other members which support the deck. Each truss always includes a top and bottom chord, the major beams which resist

5000-541: The Sunrise Bridge (less than half a mile west) in 1968. The Fair Oaks Bridge was closed to traffic in 1967 and became the property of the Sacramento County Parks and Recreation Department after serving more than fifty years as the major crossing over the lower American River. Parks and Recreation re-decked and painted the bridge in 1973 and opened it as a pedestrian and bicycle crossing that currently connects to

5100-423: The United States before 1850. Truss bridges became a common type of bridge built from the 1870s through the 1930s. Examples of these bridges still remain across the US, but their numbers are dropping rapidly as they are demolished and replaced with new structures. As metal slowly started to replace timber, wrought iron bridges in the US started being built on a large scale in the 1870s. Bowstring truss bridges were

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5200-407: The Western Bridge and Construction Company of Omaha that built truss bridges throughout the West but only rarely in California. A truss bridge is any bridge whose individual members are connected in a triangular pattern. Truss bridges date back to at least the 16th century, although the metal truss bridge, such as the Fair Oaks Bridge, dates only to the 1840s. These metal truss bridges, especially

5300-461: The availability of machinery, and the cost of labor. In other cases, the appearance of the structure may take on greater importance and so influence the design decisions beyond mere matters of economics. Modern materials such as prestressed concrete and fabrication methods, such as automated welding , and the changing price of steel relative to that of labor have significantly influenced the design of modern bridges. A pure truss can be represented as

5400-550: The bending induced by stresses on the bridge. The top and bottom are connected by some combination of vertical and/or diagonal members, usually both, as well as by major beams at each end, called endposts. The Pratt truss form, invented in 1844 by Thomas and Caleb Pratt, is the most common truss form in California and the United States. This form first appeared as a "combination truss" built in wood and iron with wooden vertical members, chords, and endposts, and iron tension diagonals. The basic form changed to all-metal construction by

5500-632: The bridge companies marketed their designs, with the Wrought Iron Bridge Company in the lead. As the 1880s and 1890s progressed, steel began to replace wrought iron as the preferred material. Other truss designs were used during this time, including the camel-back. By the 1910s, many states developed standard plan truss bridges, including steel Warren pony truss bridges. In the 1920s and 1930s, Pennsylvania and several states continued to build steel truss bridges, using massive steel through-truss bridges for long spans. Other states, such as Michigan , used standard plan concrete girder and beam bridges, and only

5600-406: The bridge deck, they are susceptible to being hit by overheight loads when used on highways. The I-5 Skagit River bridge collapsed after such a strike; before the collapse, similar incidents had been common and had necessitated frequent repairs. Truss bridges consisting of more than one span may be either a continuous truss or a series of simple trusses. In the simple truss design, each span

5700-843: The bridge: Late 19th through early 20th centuries 1890s 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s Citrus Ancestral species: Citrus maxima – Pomelo Citrus medica – Citron Citrus reticulata – Mandarin orange Citrus micrantha – a papeda Citrus hystrix – Kaffir lime Citrus cavaleriei – Ichang papeda Citrus japonica – Kumquat Important hybrids: Citrus × aurantiifolia – Key lime Citrus × aurantium – Bitter orange Citrus × latifolia – Persian lime Citrus × limon – Lemon Citrus × limonia – Rangpur Citrus × paradisi – Grapefruit Citrus × sinensis – Sweet orange Citrus × tangerina – Tangerine See also List of citrus fruits . Citrus

5800-413: The center of origin of the genus Citrus is likely the southeast foothills of the Himalayas , in a region stretching from eastern Assam , northern Myanmar , to western Yunnan . It diverged from a common ancestor with Poncirus trifoliata . A change in climate conditions during the Late Miocene (11.63 to 5.33 mya ) resulted in a sudden speciation event . The species resulting from this event include

5900-493: The center, the opposite of the Pratt truss . In contrast to the Pratt truss, the diagonal web members are in compression and the vertical web members are in tension. Few of these bridges remain standing. Examples include Jay Bridge in Jay, New York ; McConnell's Mill Covered Bridge in Slippery Rock Township, Lawrence County, Pennsylvania ; Sandy Creek Covered Bridge in Jefferson County, Missouri ; and Westham Island Bridge in Delta, British Columbia , Canada. The K-truss

6000-435: The center. Many cantilever bridges, like the Quebec Bridge shown below, have two cantilever spans supporting a simple truss in the center. The bridge would remain standing if the simple truss section were removed. Bridges are the most widely known examples of truss use. There are many types, some of them dating back hundreds of years. Below are some of the more common designs. The Allan truss , designed by Percy Allan ,

6100-414: The compression members and to control deflection. It is mainly used for rail bridges, showing off a simple and very strong design. In the Pratt truss the intersection of the verticals and the lower horizontal tension members are used to anchor the supports for the short-span girders under the tracks (among other things). With the Baltimore truss, there are almost twice as many points for this to happen because

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6200-399: The construction of a stadium, with the upper chords of parallel trusses supporting a roof that may be rolled back. The Smithfield Street Bridge in Pittsburgh, Pennsylvania , is another example of this type. An example of a lenticular pony truss bridge that uses regular spans of iron is the Turn-of-River Bridge designed and manufactured by the Berlin Iron Bridge Co. The Pauli truss is

6300-408: The damaging citrus tristeza virus , while the aphid-like Asian citrus psyllid can carry the bacterium which causes the serious citrus greening disease . This threatens production in Florida, California, and worldwide. Citrus groves are attacked by parasitic Nematodes including citrus ( Tylenchulus semipenetrans ) and sheath nematodes ( Hemicycliophora spp.). Citrus plants can develop

6400-432: The deficiency condition chlorosis , characterized by yellowing leaves. The condition is often caused by an excessively high pH ( alkaline soil ), which prevents the plant from absorbing nutrients such as iron, magnesium , and zinc needed to produce chlorophyll . Some Citrus species contain significant amounts of furanocoumarins . In humans, some of these act as strong photosensitizers when applied topically to

6500-415: The desired fruiting cultivars onto rootstocks selected for disease resistance and hardiness. The trees are not generally frost hardy. They thrive in a consistently sunny, humid environment with fertile soil and adequate water. The colour of citrus fruits only develops in climates with a ( diurnal ) cool winter. In tropical regions with no winter at all, citrus fruits remain green until maturity, hence

6600-430: The diagonals and helped resist stresses. The current Fair Oaks Bridge is the third manifestation of an overpass over the American River and connects Fair Oaks to the greater Sacramento region. Once a major crossing over the American River, it has been bypassed by the construction of bridges at Sunrise and Hazel in the 1950s and 1960s. The bridge, however, continues to serve as a pedestrian and bicycle crossing and remains

6700-414: The double truss bridge that still survives and services the community today. In fact, because of its historical and architectural significance, it was placed on the National Register of Historic Places in September 2006. The Fair Oaks Bridge's usefulness, however, diminished with the construction of bridges at Watt Avenue (to the west) in 1959 and Hazel Avenue (to the east) in 1967, as well the widening of

6800-456: The earliest evidence are seeds recovered from the Hala Sultan Tekke site of Cyprus , dated to around 1200 BCE. Other archaeobotanical evidence includes pollen from Carthage dating back to the 4th century BCE; and carbonized seeds from Pompeii dated to around the 3rd to 2nd century BCE. The earliest complete description of the citron was written by Theophrastus , c.  310 BCE . Lemons, pomelos, and sour oranges were introduced to

6900-414: The earliest examples is the Old Blenheim Bridge , which with a span of 210 feet (64 m) and a total length of 232 feet (71 m) long was the second-longest covered bridge in the United States, until its destruction from flooding in 2011. The Busching bridge, often erroneously used as an example of a Long truss, is an example of a Howe truss, as the verticals are metal rods. A Parker truss bridge

7000-692: The early 21st century mainly by the increase in cultivation areas, improvements in transportation and packaging, rising incomes and consumer preference for healthy foods. In 2019–20, world production of oranges was estimated to be 47.5 million tonnes, led by Brazil, Mexico, the European Union, and China as the largest producers. Among the diseases of citrus plantations are citrus black spot (a fungus), citrus canker (a bacterium), citrus greening (a bacterium, spread by an insect pest), and sweet orange scab (a fungus, Elsinöe australis ). Citrus plants are liable to infestation by ectoparasites which act as vectors to plant diseases: for example, aphids transmit

7100-420: The first bridges designed in the 19th and early 20th centuries. A truss bridge is economical to construct primarily because it uses materials efficiently. The nature of a truss allows the analysis of its structure using a few assumptions and the application of Newton's laws of motion according to the branch of physics known as statics . For purposes of analysis, trusses are assumed to be pin jointed where

7200-590: The flooding of 1906 and 1907 that the Sacramento Chamber of Commerce committed itself to dealing with the problems of flooding in Sacramento generally and sponsored the rebuilding of a bridge at Fair Oaks: "With destruction as a teacher, Sacramento learned an expensive lesson and determined there should be no repetition." By the end of the year the Western Bridge and Construction Company of Omaha, Nebraska began

7300-761: The genus Citrus associated with modern Citrus cultivars are the mandarin orange , pomelo , and citron . Almost all of the common commercially important citrus fruits (sweet oranges, lemons, grapefruit, limes, and so on) are hybrids between these three species, their main progenies, and other wild Citrus species within the last few thousand years. Citrus plants are native to subtropical and tropical regions of Asia, Island Southeast Asia , Near Oceania , and northeastern and central Australia. Domestication of citrus species involved much hybridization and introgression , leaving much uncertainty about when and where domestication first happened. A genomic, phylogenic, and biogeographical analysis by Wu et al. (2018) has shown that

7400-551: The genus Citrus . The false oranges, Oxanthera from New Caledonia , have been transferred to the Citrus genus on phylogenetic evidence. The earliest introductions of citrus species by human migrations was during the Austronesian expansion ( c.  3000 –1500 BCE), where Citrus hystrix , Citrus macroptera , and Citrus maxima were among the canoe plants carried by Austronesian voyagers eastwards into Micronesia and Polynesia . The citron ( Citrus medica )

7500-453: The locules, which provide nourishment to the fruit as it develops. The genus is commercially important with cultivars of many species grown for their fruit. Some cultivars have been developed to be easy to peel and seedless, meaning they are parthenocarpic . The fragrance of citrus fruits is conferred by flavonoids and limonoids in the rind. The flavonoids include various flavanones and flavones . The carpels are juicy; they contain

7600-604: The main genus, Citrus , and the genus Poncirus (such as the trifoliate orange ), which is closely enough related that it can still be hybridized with all other citrus and used as rootstock. These estimates are made using genetic mapping of plant chloroplasts . A DNA study published in Nature in 2018 concludes that the genus Citrus evolved in the foothills of the Himalayas , in the area of Assam (India), western Yunnan (China), and northern Myanmar . The three ancestral species in

7700-465: The majority of them had little experience with farming. Promises of a bridge being built over the American River to better transport the new colony's fruit to the booming markets in Sacramento and beyond further sustained this hope. The following year, however, investment began to diminish and the Howard-Wilson Company withdrew from the colony and with it went unfulfilled promises of a bridge over

7800-412: The needs at the site and allow rapid deployment of completed trusses. In the image, note the use of pairs of doubled trusses to adapt to the span and load requirements. In other applications the trusses may be stacked vertically, and doubled as necessary. The Baltimore truss is a subclass of the Pratt truss. A Baltimore truss has additional bracing in the lower section of the truss to prevent buckling in

7900-410: The pericarp is the mesocarp, which in citrus fruits consists of the white, spongy albedo or pith. The innermost layer of the pericarp is the endocarp. This surrounds a variable number of carpels , shaped as radial segments. The seeds, if present, develop inside the carpels. The space inside each segment is a locule filled with juice vesicles , or pulp. From the endocarp, string-like "hairs" extend into

8000-403: The presence of essential oil glands. The fruit is a hesperidium , a specialised berry with multiple carpels , globose to elongated, 4–30 cm (1.6–11.8 in) long and 4–20 cm (1.6–7.9 in) diameter, with a leathery rind or "peel" called a pericarp . The outermost layer of the pericarp is an "exocarp" called the flavedo , commonly referred to as the zest . The middle layer of

8100-585: The production and release of ethylene is gradual. According to the UN Food and Agriculture Organization , world production of all citrus fruits in 2016 was 124 million tonnes, with about half of this production as oranges. At US $ 15.2 billion equivalent in 2018, citrus trade makes up nearly half of the world fruit trade, which was US$ 32.1 billion that year. According to the United Nations Conference on Trade and Development , citrus production grew during

8200-559: The short verticals will also be used to anchor the supports. Thus the short-span girders can be made lighter because their span is shorter. A good example of the Baltimore truss is the Amtrak Old Saybrook – Old Lyme Bridge in Connecticut , United States. The Bollman Truss Railroad Bridge at Savage, Maryland , United States is the only surviving example of a revolutionary design in the history of American bridge engineering. The type

8300-451: The simplest truss styles to implement, the king post consists of two angled supports leaning into a common vertical support. This type of bridge uses a substantial number of lightweight elements, easing the task of construction. Truss elements are usually of wood, iron, or steel. A lenticular truss bridge includes a lens-shape truss, with trusses between an upper chord functioning as an arch that curves up and then down to end points, and

8400-449: The skin, while others interact with medications when taken orally in the grapefruit juice effect . Due to the photosensitizing effects of certain furanocoumarins, some Citrus species cause phytophotodermatitis , a potentially severe skin inflammation resulting from contact with a light-sensitizing botanical agent followed by exposure to ultraviolet light. In Citrus species, the primary photosensitizing agent appears to be bergapten ,

8500-546: The spur and railroad station were built. The station was named Fair Oaks Bridge Depot. The spur to the main line of the Southern Pacific Railroad Co. helped Fair Oaks farmers and fruit companies prosper by enabling growers to distribute fresh fruit to a vast market. Fair Oaks grew rapidly with the completion of the Fair Oaks Bridge and the railroad line. This first Fair Oaks Bridge, however, was washed out in

8600-450: The standard for covered bridges built in central Ohio in the late 1800s and early 1900s. The Pegram truss is a hybrid between the Warren and Parker trusses where the upper chords are all of equal length and the lower chords are longer than the corresponding upper chord. Because of the difference in upper and lower chord length, each panel is not square. The members which would be vertical in

8700-462: The state of California (behind the historic truss bridge in Folsom that connects to Orangevale, built in 1893). The Sacramento County Surveyor hoped to minimize the number of piers in this dangerous current that necessitated very long main spans. The Pennsylvania Petit specifically addressed such applications. The two 200 ft spans were quite daring for their time. The bridge is also a rare example of

8800-464: The straight components meet, meaning that taken alone, every joint on the structure is functionally considered to be a flexible joint as opposed to a rigid joint with the strength to maintain its shape, and the resulting shape and strength of the structure are only maintained by the interlocking of the components. This assumption means that members of the truss (chords, verticals, and diagonals) will act only in tension or compression. A more complex analysis

8900-472: The term lenticular truss and, according to Thomas Boothby, the casual use of the term has clouded the literature. The Long truss was designed by Stephen H. Long in 1830. The design resembles a Howe truss , but is entirely made of wood instead of a combination of wood and metal. The longest surviving example is the Eldean Covered Bridge north of Troy, Ohio , spanning 224 feet (68 m). One of

9000-442: The top member is sufficiently stiff then this vertical element may be eliminated. If the lower chord (a horizontal member of a truss) is sufficiently resistant to bending and shear, the outer vertical elements may be eliminated, but with additional strength added to other members in compensation. The ability to distribute the forces in various ways has led to a large variety of truss bridge types. Some types may be more advantageous when

9100-480: The tropical "green oranges". The terms 'ripe' and 'mature' are widely used synonymously, but they mean different things. A mature fruit is one that has completed its growth phase. Ripening is the sequence of changes within the fruit from maturity to the beginning of decay. These changes involve the conversion of starches to sugars, a decrease in acids, softening, and s change in the fruit's colour. Citrus fruits are non- climacteric and respiration slowly declines and

9200-545: The truss members are both above and below the roadbed it is called a through truss; an example of this is the Pulaski Skyway , and where the sides extend above the roadbed but are not connected, a pony truss or half-through truss. Sometimes both the upper and lower chords support roadbeds, forming a double-decked truss . This can be used to separate rail from road traffic or to separate the two directions of road traffic. Since through truss bridges have supports located over

9300-471: The truss. Continuous truss bridges were not very common before the mid-20th century because they are statically indeterminate , which makes them difficult to design without the use of computers . A multi-span truss bridge may also be constructed using cantilever spans, which are supported at only one end rather than both ends like other types of trusses. Unlike a continuous truss, a cantilever truss does not need to be connected rigidly, or indeed at all, at

9400-428: The upper chord under compression. In a cantilever truss the situation is reversed, at least over a portion of the span. The typical cantilever truss bridge is a "balanced cantilever", which enables the construction to proceed outward from a central vertical spar in each direction. Usually these are built in pairs until the outer sections may be anchored to footings. A central gap, if present, can then be filled by lifting

9500-406: The weather is too cold to grow it outdoors; Citrofortunella hybrids have good cold resistance. Lemons appear in paintings, pop art, and novels. A wall painting in the tomb of Nakht in 15th century BC Egypt depicts a woman in a festival, holding a lemon. In the 17th century, Giovanna Garzoni painted a Still Life with Bowl of Citrons , the fruits still attached to leafy flowering twigs, with

9600-430: The wood is employed for compression elements while other types may be easier to erect in particular site conditions, or when the balance between labor, machinery, and material costs has certain favorable proportions. The inclusion of the elements shown is largely an engineering decision based upon economics, being a balance between the costs of raw materials, off-site fabrication, component transportation, on-site erection,

9700-414: Was also easy to assemble. Wells Creek Bollman Bridge is the only other bridge designed by Wendel Bollman still in existence, but it is a Warren truss configuration. The bowstring truss bridge was patented in 1841 by Squire Whipple . While similar in appearance to a tied-arch bridge , a bowstring truss has diagonal load-bearing members: these diagonals result in a structure that more closely matches

9800-529: Was also introduced early into the Mediterranean basin from India and Southeast Asia. It was introduced via two ancient trade routes: an overland route through Persia , the Levant and the Mediterranean islands; and a maritime route through the Arabian Peninsula and Ptolemaic Egypt into North Africa. Although the exact date of the original introduction is unknown due to the sparseness of archaeobotanical remains,

9900-405: Was named after its inventor, Wendel Bollman , a self-educated Baltimore engineer. It was the first successful all-metal bridge design (patented in 1852) to be adopted and consistently used on a railroad. The design employs wrought iron tension members and cast iron compression members. The use of multiple independent tension elements reduces the likelihood of catastrophic failure. The structure

10000-659: Was popular with the Baltimore and Ohio Railroad . The Appomattox High Bridge on the Norfolk and Western Railway included 21 Fink deck truss spans from 1869 until their replacement in 1886. There are also inverted Fink truss bridges such as the Moody Pedestrian Bridge in Austin, Texas. The Howe truss , patented in 1840 by Massachusetts millwright William Howe , includes vertical members and diagonals that slope up towards

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