Thorpe, William Henry · London, E. & F.N. Spon, limited; New York, Spon & Chamberlain · leaf 144
nts for other girders may be read offdirect. It will be apparent that it must be necessary to STRENGTHENING OF RIVETED BRIDGES. 129 place the centie girder at such a height as to leave a spacebetween the old and the new work greater than the amountto be screwed up, this excess clearance being… … Fig. 72. Great care is necessary at the outset to ascertain the truespacing of the cross-girders, to ensure that the bolt-holes inthe bottom flange of the centre girder shaU come wheredesired. The fixing of the cross-girder brackets also needsclose attention to avoid after trouble, the bolt-holes…
Bridges
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