cylinders will be the slowness of operation of the draws. In order to filled with water ; and the exterior surface of the outer overcome this objection, William L. Sampson, of Ocean shell will be enveloped by flame or heat. The steam Grove, N. J., has constructed a drawbridge which con- generated… … aprons will be raised. In order to lock the spans securely in place when the waterway is closed, and to prevent all lateral movement, the outer trusses are provided with heels interior cylinder acting somewhat like an inverted bell- extending upon the floors of the opposite spans as jar. When the…
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