E . connected by diaphragm plates varying from inch to y inch thick , and four angle irons varying from 3 inches by 3 inches by inch to 4 inches by 4 inches by y inch . The diaphragm plates are perforated with oval holes to give a light appearance to the bridge . The side plates of the bracings are… … Fig . 744 — Section of Cross Box Girder . ming girders between them . The cross girders of a box section are 2 feet deep , with webs y inch thick ; top plates 1 foot 6 inches wide , and y inch thick , and bottom plates 2 feet 2 inches wide , and y inch thick , all connected together with angle…
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![An illustration from Rudiments of the art of building : represented in five sections [...] for the use of architects, builders, draghtsmen, machinists, engineers and mechanics (1853)](https://img.insideoutlibrary.com/img/200/ia-rudimentsofartof00bull-57-21.webp)
