e fast at the forward bumper, V, and plank spring, U ; and before the ten- the canal that boats can freely pass under them. sion of the spring is taken up, the bridge starts from side and is drawn around it, then passes over the pul- This class of bridges necessitates the building of an its… … SCHNEIDER AND MONTGOMERY'S SELF-ACTING DRAWBRIDGE FOR CANALS, ETC. such bridges have heretofore been exclusively used The. chain is secured to the hollow weight, Q, and allowing it to puss through without breaking and on canals in preference to flat drawbridges, which do is made in two parts for…
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