MYOGRAPHS 



115 



CH. X.] 



of wet blotting-paper. A somewhat elaborate form of moist chamber 



is shown in fig. 144. 



FIG. 143. Pendulum myograph and accessory parts (Pick'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. 144. Moist Chamber. 



