Bridge (instrument)
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A bridge is a device that supports the strings on a stringed musical instrument and transmits the vibration of those strings to another structural component of the instrument—typically a soundboard, such as the top of a guitar or violin—which transfers the sound to the surrounding air. Depending on the instrument, the bridge may be made of carved wood, metal or other materials. The bridge supports the strings and holds them over the body of the instrument under tension.
A violin bridge blank and a finished bridge.
A guitar's bridge holds its strings fast to the instrument; its saddle (white) raises them above the bridge and conveys their vibrations to the bridge. The black fasteners are called string pegs. The black fasteners are "loose"—held in place only by string tension.
A licensed Kahler vibrato system on an '87 Gibson Les Paul Standard. Note that the "whammy bar" lever is not attached in this photo.
Violin family
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The violin family of musical instruments was developed in Italy in the 16th century. At the time the name of this family of instruments was viole da braccio which was used to distinguish them from the viol family. The standard modern violin family consists of the violin, viola, cello, and (possibly) double bass.
Violin, viola, and cello bow frogs (top to bottom)
An octobass
Image: Cello front side
Image: AGK bass 1 full