284 



THE HUMAN MOTOR 





Jtfajs of brass fobe filed 

 terany other metal) 

 *fttox(e/j box containing 

 mechanism . 



rotect the 



. 

 - ' fate a/aim which Me baits 



Jfefat rod with a plate resting 



&n rubber buEb . f 

 . Jiettca/ spring with a force o//-2OKfrj. 

 . Tube ^bearing receiving the spring. 



jBex noMthrf the rubber bulb 

 '"::. Rubber bulb 



ube communicating ustfTi 

 / tympan . 



FIG. 183. 

 The Author's dynamometric support. 



a steel blade, AB, which is riveted to the part P at one end, and 

 at the other joins a bar, BC. The movement of the steel blade 

 AB, in the effort of cutting, is transmitted to an indiarubber 

 bulb, K, placed between it and the handle MN of the pruning 

 shears. The bulb is connected by an elastic tube to a receiving 

 tambour. 



A stop, a, soldered to the blade L, assures that the vine-shoots 

 are always placed at the same point. 



214. Imbert was equally successful in registering the efforts 

 made in filing, that is to say, the pressure exerted on the vice, 

 the efforts of the left-hand which guides the tool and the effort of 

 the right hand on the handle, but he did not publish his 

 methods. f 1 ) The author's arrangements for the same investi- 

 gation were as follows ( 2 ) : The part to be filed, a brass rod, for 



() A. Imbert (Revue Gtntrale des Sciences, 1911, p. 485). 

 () Jules Amar (Journ. de Physiol., Jan., 1913, p. 62). 



