Thorpe, William Henry · London, E. & F.N. Spon, limited; New York, Spon & Chamberlain · leaf 36
ingthrough. At the best such rivets wUl not be well placed toinsure good workmanship, and the severe treatment to whichthey become subject, as the cross-girders take their load and BRIDGE FLOORS. 21 deflect under it, will be very apt to loosen them. The authorhas seen a case of this kind (see Figs.… … FlG. 11. ments, but by resting upon the main-girder flanges, whichin turn, by repeated twisting, tore the web for a length of4 feet; there was also pronounced side flexure of the topbooms. The movements generally on this bridge (of 42-feetspan), whether of main or cross-girders, were very consider-
Bridges
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