160 



BURTON EDWARD LIVINGSTON 



in the lower plate. The arms are thus rigidly attached to the 

 lower hub. 



The vertical axis is formed from a steel rod (f-inch in diameter 

 and 2 feet long), drilled and tapped at either end to receive the 

 short free end of the ordinary bicycle axle bolt. After the bear- 



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Arrangement of Bicycle Hubs and Attachments for Rotating Table 



Fig. 1 Lower hub: A, pulley; B, upper plate, riveted to hub; C, lower 

 plate, attached to B by bolt E; D, wooden arm, attached to C by bolt e and 

 clamped between B and C; F, axis extension; G, top of pipe support with 

 socket for end of axis. 



Fig. 2 Upper hub: B, plate riveted to hub and with holes (E) for attach- 

 ment of guy-wires reaching to ends of wood arms; H, plate attached to upright 

 upper support from ceiling (/) and serving to fix upper end of axis. 



