- inch rivets ( Figs . 742 , 743 ) . The roadway is carried on cross girders with longitudinal trim - o o o o 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… … Fig . 745 . - — Joining of the Longitudinal Girders with the Cross Box Girders . securely rivetted between the lower booms at every vertical trian - gulated bracing by angle irons , knees , and gusset plates . Between
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