cities, towns and villages through which canals Similar letters indicate like parts on all the figures. on the roadway to enable a person to reach the center pass, the bridges in general are few in number and The figures will be more readily understood by bear- and friction rollers under the bridge… … verely tested by the passage of heavily loaded wag- A buffer is secured on each side at the lower part raise the cross timbers, E, to the proper hight; I ons, and appears as permanent and durable as the or- of the railing of the swing roadway; U is the are cross timbeis under the bridge ; J are…
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