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Callender-Hamilton bridge
The Callender-Hamilton bridge is a modular portable pre-fabricated truss bridge. It is primarily designed for use as permanent civil bridging as well as for emergency bridge replacement and for construction by military engineering units. Assembling a Callender-Hamilton bridge takes much longer than the more familiar Bailey bridge as it is made up of individual lengths of galvanised steel bolted together with galvanised high-strength steel bolts, all of which require torque settings. It is stronger and simpler in design concept than the Bailey bridge.
==History==
The Callender-Hamilton bridge system was designed by the New Zealand civil engineer, A. M. Hamilton, and patented by him in 1935. The system is currently fabricated by Painter Brothers, Hereford, operating within the Balfour Beatty Power Networks Division formerly British Insulated Callender's Cables.
Hamilton's bridge concept was inspired by his work between 1928 and 1932 as principal engineer on the 'Hamilton Road' through Iraqi Kurdistan. He described the building of this road in his book, ''Road Through Kurdistan: Travels in Northern Iraq'', 1937. Hamilton became aware of the need for strong, adaptable bridges made from simple components that could easily be transported and erected in remote locations or on difficult terrain. Hamilton was awarded £4,000 in 1936 by the War Office for the use of his early bridges and the Royal Commission on Awards to Inventors awarded him £10,000 in 1954 for the partial breach of his patent by the design of the Bailey bridge.〔
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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