75 feet should be provided withrollers. Without some such device for decreasing the friction,the continual expansion and contraction of the trusses produced bychanges of temperature, would tend to destroy the masonry. Rollersare only used at one end of the bridge, the other end being firmlyfixed to… … Pig. 52 Fig. 53 pedestal from slipping to either side. The rollers shown in Pig. 53, constitute practically,the only alternative form of the preceding. The rollers are heldin position by two side bars which are fastened together by rods it as shown. The masonry bed plate and the shoe plate of the…
Bridges · Theses
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