CEKTAIX MOVEMENTS IN MAN 



149 



uncovered so that the tube of which it is made can he 

 seen, the others are placed between cardboard discs. 

 All the tubes which lead from these spirals unite in 

 a common collecting-tube which communicates with 

 the chamber of the recording tambour. A plate held 

 in position by metal clips accurately covers all these 



Fi -. 100.— Dynamographic platform for giving a curve of foot-pressure on the ground. 



spirals. Such is the general structure of the dynamo- 

 graphic platform.* 



When a man mounts this platform the registering 

 lever is raised to a variable height, and remains in 

 the same position as long as he does not move. 

 The discursion of the lever expresses the weight of 

 the body ; but however slightly the man may move, the 



* C. B. de VAcadem.it des Sciences, October 8, 1892. 



