CHAPTER II 



HINTS ON STEREOSCOPIC PHOTOGRAPHY AND HOW 

 TO MAKE A STEREOSCOPE AND PORTABLE TENT 



By Rev. S. N. Sedgwick, M.A. 



THE ADVANTAGE OF TWO GOOD EYES 



The special feature of the illustrations in this book 

 consists in the stereoscopic pictures, about which 

 our young readers may like to have a few words. 



Stereoscopy — " solid - seeing " — depends upon 

 our having the use of both eyes. The picture 

 which the left eye sees is slightly different from 

 that which the right eye sees; that is to say, in 

 viewing any object the left eye sees a little more 

 round it on the left, and the right eye further 

 round it on the right. These two pictures com- 

 bine to form one single impression, and the effect 

 is that the object stands out in relief, or solidly, in 

 the midst of its surroundings. 



I have to confess that, whilst writing upon this 

 subject, I have never been able myself to see any- 

 thing stereoscopically, being deficient in one eye; 

 and it is with a little touch of envy that I have 

 taken the stereoscopic pictures in this book, and 

 heard my friends' exclamations of delight as they 

 have looked at them through a stereoscope! The 



