BCIOPTICON MANUAL. 35 



without jumping them about. The stage o slants down 

 to the condenser, to keep the slides down close to it. 



Take the slides out with the left hand as others are 

 pushed into place, so as to leave none of the white disk 

 visible, and put them in their box as before. A slide 

 standing endwise between those which have been used 

 and those which have not, will keep them apart. 



As photographers are giving increasing attention to 

 preparing slides, there is an increasing proportion in the 

 market of the size of half a stereoscopic view, or 3J 

 inches square, bound with narrow binding. For these 

 a wooden stage 9 inches long is attached to o o', so that, 

 without crowding a picture out at the end, its successor 

 may be pushed into its place, by the finger following to 

 where the cylinder and stage intersect; with the left 

 hand at the button attached to the back stop we may : 

 1. Close stop. 2. Slide in the picture. 3. Uncover so 

 that in the time of counting three we have changed the 

 scene without any visible movement. This, well man- 

 aged, is better than dissolving views poorly managed. 



Tanks for insects, fish, chemical experiments, &c., &c., 

 slide into the stage as easily as pictures. The stage 

 being open at the top, with no bulky lantern case to ob- 

 struct it, is peculiarly suited to all such operations. 



A slender wire in the direction r 0', answers the pur- 

 pose of a long rod pointing upward on the screen to 

 explain the representations. 



The simplicity and completeness of the Sciopticon are 

 more evident in practice than may seem while consider- 

 ing so wide a range of details and contingencies. The 

 advantage of having an instrument so completely under 

 one's hand is not only felt by the operator, but the 

 smoothness it gives to the exhibition is appreciated by 

 spectators. 



