20 STEREOSCOPIC PHOTOGRAPHY 



The side D C is cut to fit the nose. E is cut to 

 form a handle by which to hold the card. It will 

 be noticed that A B is not at right angles to B C, 

 but slightly obtuse, for the convenience of viewing 

 pictures in a book upon a table. The card should 

 be covered with dull black paper both sides, and 

 to use it, the nose should be rested in the part cut 

 out for it, D C; the edge A B placed on the book, 

 so that the card comes between the two eyes. The 

 left eye will now see the left-hand picture only; 

 the right eye, the right-hand picture; and if the 

 card be of the right length for the eyesight, the 

 stereoscopic effect will be seen at once. Other- 

 wise it would be well to experiment with rect- 

 angular pieces of cardboard of different lengths 

 until the right distance from the eyes to the 

 picture is obtained. 



This suggestion for a simple stereoscope was 

 made a few years ago in one of the photographic 

 papers, I believe; I regret I cannot discover to 

 whom my acknowledgments for it should be made. 

 The following is an improvement upon it which 

 will suit any sight. 



A B C D is a piece of cardboard 4^ inches broad 

 and about 12 inches long. E G H F is a second 

 piece, cut double, and folded over, the under side 

 just showing at G H P. The piece A B D C slides 

 inside E F H G, a slot being cut in it at K L, and 

 two paper fasteners M N being passed through the 



