264 



THE HUMAN MOTOR 



of the tympan. The sphyg- 

 mograph of the transmission 

 type is fixed to the arm by 

 means of bands R, attached 

 to the mounting M. 



The pressure of the spring 

 regulated by the screw V. 



Marey's tambour can be 

 used for the registration of 

 any motions. Thus it can 

 be used to record the swell- 

 Flt - lia - ' ing or shortening of a muscle 



Marey's Transmitting Sphygmograph. and for the g enera l study 



of myography. There is no need, therefore, to describe further 

 applications, as they depend on the ingenuity of the user and on 

 various circumstances. 



196. The record is obtained by bringing the style of the 

 receiving tympan in contact with smoked paper, covering a 

 cylinder which turns at the desired speed. 



The friction of the style on the paper must be negligible, styles 

 made of bamboo or straw being very suitable. Glazed commercial 

 paper is used covered with a relatively thin coating of lamp black, 



fca. 150. 



How to blacken a registering cylinder. 



