f the workman cylinder eccentrically to the shaft. Rocking-blocks Upon rotating the gear-wheel shaft, the pinions are increases. oscillate in concave recesses at the outer ends of the made torevolve. When the lower pinions are in mesh The Pittsburg Reduction Company, who have col- openings in the… … ing the lower portion of a bicycle wheel. A third hook is secured to a vertical support connected to the frame, and receives the tion, they roll off on this fixed gear-wheel, and, there- upper portion of the wheel. A bicycle pump fore, the disk carrying the pinions is made to revolve is provided…
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten04unit-578-0.webp)
