HOME-MADE STEREOSCOPE 



21 



slit to act as guides and to keep the doubled 

 portion (E F H G) together. Extra paper fasteners 

 can be put into the handle F P. 



It is obvious that the length of A G can be 

 reduced or extended by pushing the first piece 

 A B D C in or out of the second; and so this simple 

 contrivance may be used to fit all sights. 



Improved Design for Home-made Stereoscope. 



The disadvantage of this instrument is that 

 there is no magnification of the pictures. For 

 such a purpose a more elaborate stereoscope is 

 required. 



The well-known American form of stereoscope, 

 costing IS. 6d., can easily be adapted for viewing 

 the pictures in this book. 



All that is necessary is to cut a slot in A B, and 

 provide an extra slip of wood C D, which can be 

 made to work backwards or forwards underneath 



