CH. IX.] 



MYOGRAPIIS 



95 



of wet blotting-paper. One form of moist chamber is shown in 



FIG. 116. Pendulum Myograph and accessory parts (Fick's pattern). A, pivot upon which pendulum 

 swings ; B, catch on lower end of myograph opening the key, C, in its swing ; D, a spring-catch 

 which retains myograph, as indicated by dotted lines, and on pressing down the handle of which 

 the pendulum swings along the arc to D on the left of figure, and is caught by its spring. 



The last piece of apparatus necessary is a time-marker, so that 

 the events recorded in the myogram can be timed. The simplest 



FIG. 117. Moist Chamber. 



