SCIOPTICON MANUAL. 145 



THE SCIOPTICON TINTERS. The tinting-glasses are 

 drawn up close behind the objective lens by means of 

 rods terminating in knobs above. This lets tbe color 

 down upon the screen not with a sharp outline like 

 the curtain, but with a gradual shading. With the blue 

 tint partially drawn, this property gives to plain pho- 

 tographs of scenery, a blue sky, shading off without 

 abruptness down to the horizon. Slightly drawing up 

 the blue, then the red, and then turning the button 

 attached to the opaque curtain a little, fades away 

 gradually the upper portion of the disk, as is desirable 

 in such slides as the Ascension. The reverse movements 

 bring into view gradually the " Soldier's Dream, " "An- 

 gel of Peace," &c., nearly as well as with two slides in 

 the dissolving lanterns. All the appearances formerly 

 produced by colored glass slides are better effected by 

 these tinters. If at any time the rods become t<k> loose, 

 the stop screws may be tightened. 



THE NEW SLIDE STOP. The catch drawn out from the 

 underside of the stage, and turned back almost out of 

 the way, is intended to stop the slide in its proper posi- 

 tion, but not to interfere with its being moved smoothly 

 along and out by the incoming slide when slipped for- 

 ward from the catch by the left hand. 



The catch pushed back into its sheath, leaves the 

 stage entirely unobstructed for those who prefer to ad- 

 just the slides by hand only, and for other than wooden 

 slides. 



The use of stops is the more necessary with a pah of 

 instruments, as it is essential to a proper effect that the 

 dissolving views should occupy exactly the same place 

 on the screen without any readjustment after the dis- 

 solving becomes visible. 



