A bridge post screws into a metal body bushing with an incorporated thumbwheel on the Nashville design bridge. Turning the thumbwheel pushes the entire assembly up or down as it screws into the metal body bushing to change the height. The bushing is attached to the center of the underside of the bridge by two long bolts that pass through holes in the sides of the bushing.
The name comes from its inventor, J.E. "Dink" Anderson, who sold his business in Nashville, Tennessee in 1872. Before he died in 1897, he instructed his son to continue making his bridges if the company was successful at selling them. So, today, almost every bridge made by Anderson Iron Bridge Company is called a Nashville-style bridge.
An electric thumbwheel replaced the mechanical one on new bridges after they were installed. This saved labor and time while still allowing the operator to adjust the height of the bridge remotely. These electric thumbwheels could not be used on old bridges because there was no way to stop them from raising the roadbed higher than desired. If this happened, more weight would need to be put on the screw to lower the bridge back down. This would weaken the screw enough for the bridge to fall down if someone was under it when it happened.
People often think that all bridge designs will raise or lower in exactly equal increments; this is not true.
The bridge should now be flat side to side and barely 1/8 inch off the deck. If it's still too high, detune slightly and retune with another 1/4 turn clockwise on each claw screw. Adjust your saddle heights after the bridge has reached the desired height. You may need to do this for both strings at once.
Stratocasters came in several different sizes, from small to extra-large, but most have the same basic shape: a flat board on which is mounted an angled soundpost inside the body of the guitar. The term "stryker" is sometimes used to describe a large strummer. The name comes from the resemblance of the flat surface of the bridge to the flat head of a hammer.
The soundpost inside the body directs vibration away from the body and into the neck where it can travel more freely. This allows the player to use heavier gauges of string without having them buzz too loudly when played softly.
The shape of the Stratocaster's body was designed by Tom Anderson, who also created the Eton Chastain model. It's got a relatively thin waist and tall, narrow shoulders. This allows players to project the sound well while retaining good tone quality throughout the range of the instrument.
The volume control on a Strat is called a rotary switch.
Suspended bridge A bridge with a vertical lift. This type of bridge allows vehicles to pass under it by using hydraulic rams, which extend out from the sides of the bridge on either end. As the name implies, a suspended bridge suspends its deck between two towers or poles. The bridge may be single or double track.
Triborough Bridge is a three-lane divided highway bridge that connects the boroughs of Brooklyn and Queens in New York City. It is named after the two neighboring counties it spans: Brooklyn to the north and Queens to the south. Opened in 1936, the bridge carries six lanes of traffic over more than 10 miles of roadbed—four lanes in each direction. The longest suspension bridge in New York, it forms part of U.S. Route 1, which runs from Maine to Florida.
Suspension bridges have several advantages over other types of bridges. They are less likely to collapse because there is no structure above the main roadway holding up the ground beneath it. Also, there is no need for the bridge to have any structural strength itself; all it needs to do is support its own weight plus the weight of any vehicles crossing it.
Suspended bridge. The longest suspension bridge in North America when it was built in 1930. It crosses the East River between Brooklyn and New York City.
The bridge consists of two parallel cantilever arms connected by a horizontal section at the midpoint. A vertical tower stands on the far side of the river from the bridge, supporting a road deck and rail line that cross over it to reach Van Dyke Avenue in Brooklyn. The main span measures 1,200 feet from pier to pier; the river itself spans almost 400 feet wide. There are also three other smaller bridges connecting the two sides of the island upon which the city rests.
By 1940, the number of vehicles crossing the bridge had increased to about 600,000 per year. This caused serious congestion during morning and evening rush hours, so the city decided to build another bridge as a replacement. The new bridge opened in 1968.
The Williamsburg is unique among major American bridges because most of its traffic flows in an east-west direction, rather than north-south as is typical of large bridges across the United States.
A bascule bridge (also known as a drawbridge or a lifting bridge) is a moving bridge with a counterweight that continually balances a span, or leaf, throughout its upward swing to allow for boat movement. As the name suggests, a bascule bridge opens like a clamshell by rotating on a vertical axis until it is horizontal, allowing water to pass through.
Bascule bridges are used primarily to provide access to large bodies of water such as lakes or oceans. They are particularly useful for crossing small streams or other waterways that might not have enough current to support a conventional fixed bridge. Because bascule bridges open into the flow of traffic, they are designed with opening mechanisms that are efficient and reliable so as not to hinder vehicle traffic while still providing easy passage for boats and fishing vessels.
There are two main types of bascule bridges: those that use cable traction and those that use hydraulic pressure. Cable-driven bascules use cables attached to the underside of the deck that run along tracks mounted in the side of the bridge tower. As the cables pull tight, they lift the deck away from the tower and allow water to pass under the bridge. Hydraulic-driven bascules use hydraulics to power a system that operates similarly to that of a cable-driven bascule bridge.
The four bridge types listed above have been adapted to generate various different types of bridges constructed to execute specific operations. This prompted the development of the aqueduct, viaduct, bascule bridge, swing bridge, tilt bridge, truss bridge, and transporter bridge.
The first type of river bridge is the most common one and it is called a "longitudinal" or "flat" bridge. On this type of bridge, the traffic flows in parallel along the side of the river, with no vertical clearance between the road surface and the rail track or vessel deck. The length of these bridges is generally between 30 and 100 meters. They can be found on all major rivers around the world.
Next is the "vertical" bridge. On these bridges, the traffic travels along a central vertical lift shaft or elevator that takes them directly from the roadway to either the railway line or the boat deck. The length of these bridges is usually between 20 and 50 meters. They can be found on most large cities' streets as well as on some rural roads.
Aqueducts are underground passages built alongside rivers or other bodies of water for various purposes such as water supply or sewerage systems. Most often, they consist of a series of parallel tunnels dug near shoreline where there is enough room to build them without causing flooding. The tunnels may be covered by street surfaces or open air.