APPARATUS FOR PHYSIOLOGICAL USE 235 



FIG. 3. Recording manometer. The shorter limb of the bent glass tube c commu- 

 nicates at uwith the cavity in which the variations of pressure are to be recorded 

 by a flexible but inelastic tube. The tube b is for filling the instrument ; it is 

 closed by a screw clamp. The mercurial column in the open limb is represented 

 as 13 centims. higher than in the other. On the surface of the higher column 

 rests the float/, from which the rod e, with its writer w, rises ; the rod moves 

 easily in the support d. 



The word kymograph, 1 which is applied to this and all 



1 The word is incorrectly constructed, but has been so long in use 

 that it would be difficult to replace it by a better. 



