CH. IX] 



COMBINED PROJECTION 



297 



Screen Image 



Will W2 



FIG. 162. COMBINED LANTERN-SLIDE AND MICRO-PROJECTION WITH 

 Two COMPLETE OUTFITS SIDE BY SIDE. 



Wi W2 The supply wires from the outlet box (fig. 3). 

 D S Double-pole, double-throw knife switch. 

 / Binding post of supply wire W2. 

 2 Binding post for supply wire W i. 



j Binding post for the wire (W j) from the switch to the rheostat at the 

 right. 



4 Binding post for the wire (W 5) to the lower carbon of the arc lamp at the 

 right. 



5 Binding post on the switch for the wire (W 6) to the rheostat at the left. 



6 Binding post on the switch for the wire (W 5) to the lower carbon of the 

 arc lamp at the left. 



II i, H 2 Hinges for the switch blades. 



j i, j 2, j 3, j 4 Jaws for receiving the switch blades when the switch is 

 closed. 



SH Switch handle for opening and closing the switch. The switch is 

 closed at the right. On the left the handle, bar and switch blades are shown 

 with dotted lines. 



