ATTACHMENT AND TRANSMITTER 17 



right-hand picture being placed on the left, and 

 vice versa ; the principal objects being mounted 

 2J inches from one another before they can be 

 seen with effect through a stereoscope. 



Another method of obtaining stereoscopic pic- 

 tures is to take two negatives with the same 

 lens, using the camera twice. For the second 

 picture, the camera is moved zf inches to the left 

 or right, so as to obtain a slightly different view. 

 All photographic dealers sell a small wooden top 

 to fix upon the camera stand, called a " Stereo- 

 Attachment," by which the camera can be moved 

 after the first picture is taken exactly the right 

 distance for the second. These cost about 2S. 6d. 

 each. With this small piece of apparatus a 

 quarter-plate camera can be used, and is available 

 for landscapes. and still-life subjects. It is obvious 

 that it could not be used for obtaining stereo- 

 pictures of living and moving objects. 



By far the cheapest and most ingenious ap- 

 paratus for taking every kind of stereo-photo- 

 graph is the " Stereoscopic Transmitter " made by 

 B. K. Brown. This consists of two special mirrors, 

 hinged together, and fixed in front of the camera; 

 so that the images reflected in the mirrors are 

 thrown together upon the plate. The angle of 

 inclination of the mirrors can be varied, so that 

 they may be used for every possible subject; and 

 most excellent stereoscopic photographs can be 



