slightly backward. At each end was a bearing for a separate crank, and attached to the crank shaft, which ran on a ball bearing and was very short, was a chain wheel. This wheel was slightly larger than a similar wheel on the hub and the two wheels were connected by a chain. The arrangement was duplicated the other side of the main driven wheel and, as already
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Fig. 5
THE KANGAROO INTRODUCED BY PULLMAN, HERBERT AND COOPER
explained, owing to the gearing up the wheel was turned about 1½ times for one complete turn of the crank axles. Many hundreds were sold, but owing to the short crank bearings and the difficulty in keeping the chains equally adjusted, the vogue was comparatively short lived.
The Kangaroo was followed by the geared ordinary and the Bantam, Boothroyd’s patents. The first was a dwarf ordinary with a gearing in the front hub, which had the same effect as the chains and sprockets of the
