348 PHYSICAL EXPEESSION. 



method of recording movements. At first I fixed 

 writing points to the tips of the fingers, making 

 them touch a travelling sensitive surface. This 

 was a clumsy and inefficient plan. Various 

 arrangements of tambours attached to the moving 

 parts were tried, after the methods employed by 

 M. Marey, and described in his work. 



At length it occurred to me that an arrangement 

 might be used attached to the hand, but leaving 

 it free to move. 



The following account was published in the 

 British Medical Journal, September 22, 1883 : 



The apparatus * employed consists of 



1. A "motor" made of india-rubber to be attached 

 to the hand, one tube to each finger, or moving part 

 (Fig. 46, A, B, C, etc.). From these, pieces of thin 

 conducting-tube (a, b, c) carry air to a set of re- 

 cording tambours. 



2. A frame supporting the recording tambours, 

 and electrical signals (Fig. 49). 



3. A new " electrical contact-making tambour " 

 (Fig. 50). It is a modification of the Marey tam- 

 bour adapted to the purpose of actuating an 

 electrical counter. 



4. An electrical counter (Fig. 51), 



Now, as to the further details of each piece of 

 the apparatus and its uses. In the motor which 

 is attached to the hand (Fig. 46), the principle em- 

 ployed is as follows: When a cylindrical tube 



* Towards the expenses of this apparatus, a grant was made by 

 the British Medical Association on the recommendation of the 

 Scientific Grants Committee. 



