MOTION, MECHANICS, ETC. 

 Fig. 175. 



173 



Atwood's Apparatus for making experiments on the Recti- 

 lineal Motion of Bodies which are acted on by constant forces. 



This elegant and accurate machine, represented in Fig. 176, 

 page 175, is the contrivance of Mr. Atwood, and renders 

 sensible to the eye and ear, by means of a set of friction 



