; A fee 
ui fas ee a J ro 
iby ve) Par “¥ 
vie ee a r? wks 4 
S Fe “ Sveey 
" 4 . 
~ H 
4 
‘2 - 
¥ 
: 4 Plate I. 
Fig.7. Diagram of connextons when conunutator 
is a position drawn (Fig.1/ d connected with d, & 1 with ¢, 
ay 
Fig.8. Diagram of conneccions with’ commutator D 
Placed across board., d connected’ with ¢ & di, with f, 
eer 
| 
| 
Ls 
