774 



SCIENTIFIC RECREATIONS. 



pressing alternately upon treadles " (as in the detail), " caused to progress 

 by turning two small wheels hidden in a frame between the hinder pair 

 of wheels of the chaise. The description I give as I received it from 

 M. Richard, the, doctor of Rochelle. 



" A A is a roller attached to the box behind the vehicle, B is a pulley, 

 over which the cord that works with the treadles passes ; C and D are the 

 treadles, with pedals, F F. The wheels, H H, being thus put in motion, the 

 large wheels are moved, and when the hind wheels move forward, the 

 foremost ones must advance also, and the sitter has only to guide the 

 machine by the reins he holds attached to the guiding axle." 



Fig. 906. The movement. 



THE END. 



