1'LATK OIII. 



i|,hi l PtliiK-r. 



I'lif moist cliiiinhcr, whii-li is sup- 

 ported li\ tin- lar.LM- pillar, and from 



Which till' thread /( descends, is Hot 



sho\sn. Tin' lt-\ er '/ mves freely on 

 the two pillars I,/,. At / the rode, 

 hearing the mo\:iblc style </, with 

 its niovalile e mnterpoise ;f. x\\ ing.-i 

 easily. At the upix.site end of the 

 lever is tin-heavy emmtrrpoise .-. The. 

 niilleil head on the side of one of the 

 pillai-s 6 rotates the lower of the 

 TWO harseoiineetiiiKftand 6. A silk 

 thread is carried from < to this liar. 

 By turning the milled head the style 

 may thus be allowed to fall upon or 

 remove away from the recording 

 Mil-face as desired. 



t>"ic. 270. The moist 

 chamber, with the 

 nerve-muscle prepar- 

 ation, iioii-polarizable 

 elect roth's, electrode- 

 bearer, and lever in 

 position ready for 

 an observation. The 

 >;lass cover is not 

 .shown. 



FK;. 270 his. Simple 

 spring myographof Mare' , 

 arranged horizontally. 

 (Hoc oh. xix.) 



