170 



SCIOPTICON MANUAL. 



The portion of the Lime-light Sciopticon Fig. 45, includ- 

 ing the triple jet, is all that is necessary for one having the 

 Oil-light Sciopticon complete, to have the Lime-light 

 Sciopticon also complete, for the condenser, objective, and 

 draw front are perfectly suited to either. 



Fig. 45. 



The following suggestions in relation to the automatic 

 cut off may here be added in connection with the above cut. 



The flap a is held in place by tightly biting about the 

 wire b, upon which, however, if wrong at any time, it can be 

 lorced to turn so as to completely hide the moving slides, but 

 not to shade in the least the one in view. The tension at the 

 thumb-screw, now placed at the lower bearing, t, should just 

 allow the flap to fall without jar. There is now a roller 

 attached to the latch at A, bearing against the condenser ring, 

 to lessen the friction when the slides enter, and to moderate 

 its fall when let go. The forefinger should follow in the 

 groove in which the slide runs, and it is well to let the out- 

 going slide strike the thumb of the left hand placed at the 

 stop, then to lift it up level, and so out, without joggling the 

 one on the screen, and then to place the next view to the 

 latch, in readiness for another change at the right moment. 



