XXXVII.] 



PENDULUM-MYOGRAPH. 



211 



Grove's cell. The analysis may also be done by means of the " automatic 

 break " arrangement attached to the revolving drum (Lesson XXXV.). 



FiQ. 131.- Chronograph arranged to Write on a Horizontal Cylinder, as made by Veidln. 



Fig. 132.— Marey'8 Simple Myograph, as made by Verdin, 

 6. Vibrating Reed as a Chronograph. — For measuring small intervals of 

 time this is very convenient. The arrangement was first adopted by Grun- 



