McMaster, John Bach, 1852-1932, Making of America Project · New York, D. Van Nostrand · leaf 106
ickwork, thusforming a sort of mould to guide thetoothing. The middle rib (Fig. 10) is also coveredon the under surface with half inch plateiron in one piece and bolted through asshown in figure, thus giving the rib thestrength it would have if supported bythe usual struts and braces. The laggings… … FIG. 11. > 102 The back rib (Fig. 11) is covered onthe under surface with a coating of halfinch plate iron an one piece, which isbolted through as in the case of the middle rib. Between each bolt a hole ismade quite through the rib and itsplating, and in it is placed the stem ofa bearing iron.…
Bridges · Tunneling
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