“ _ VOLUME IX. ] [NUMBER 11. SCIENTIFIC. "AMERICAN, … two sections, the upper one being hinged atone pendicular. side to the lower one. The upper half has a their axes, and about an inch apart, each of the of a new railroad for Broadway, by William a spring on it, which tends to throw it open. K sheaves in form that of the one-half of a grooved Deitz,…
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