1002 MODERN STEAM PRACTICE . thick , connected together by two angle irons , 5 inches by 5 inches by 1 inch , rivetted with 1 inch rivets at 4 inches pitch . Two additional top … Fig . 740 . — Section of Boom . or bottom plates * 4 inch thick are 739 — Swing Bridge at Leith Docks , added over the bays at the centre of motion , thus making the maximum gross sectional area 97 inches for each boom . The side plates of the booms are stiffened by diaphragm plates at every 5 feet…
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