188G.] 



NEW YOEK ACADEMY OF SCIENCES. 



155 



works. This machine winds up the spring one revolution, just 

 what was unwound during the hour. In the winding the direc- 

 tion of the motion is in the direction of the hands of the clock. 



so that there is no lost power. As the spring drum reaches the 

 end of its revolution, a small finger projecting from the face of 

 the drum breaks the contact and the winding ceases. The ad- 



