ROYAL SOCIETY OF CANADA 
98 
V.) between the 201 contact wires C and a row of pins P driven into the 
The 
rollers Y and Z are kept revolving in opposite directions by means of the 
S (the “scraper”) is a rubbing contact of spring brass. 
motor Æ 
wood. 
K. 
and cogwheels 

HG 
Si [is nes SYS Se FN 

LS eS eg Mt 
