INFLUENCE OF SUSPENSION ON WATCH. 



37i 



CASE I. 



Figure I represents the first or graver funda- 

 mental mode ; the period of the upper pendulum 



CASE.I. 



Fig.t Fig, 2. 



C C 



CA SE. 2. 



Fig. 3. Fig. 4. 



C C 



:A 



CP' being made somewhat graver by the influence 

 of the lower, which, in the course of the vibration 

 always exerts a force upon it from its middle posi- 



B B 2 



