466 



SUMMAKY OF CUERENT RESEARCHES RELATING TO 



to the carrier a, which is movable on the axis h, and can also be 

 rotated in two directions. The object is pressed by the weight c 



Fig. S8. 



against the steel disk d, which is revolved by the wheel e acting on a 

 smaller toothed wheel on the axis of d. 



The second (fig. 89) is intended to be worked by the foot. The 



FiCx. 89. 



parts a, h, c and d are the same as before. The wheel and treadle at 

 / and g work the pulley e, by which the steel disk d is revolved ; h is 



