THE ARTIST'S TENT. 



257 



Sometimes a camera obscura is fitted up upon wheels, 

 like a traveling photographic apparatus, for a show ; and 

 sometimes in a tent, for the use of artists ; only in this 

 case it is necessary that the tent-cloth should be perfectly 

 opaque and dark. 



CAMERA OB8CCBA IN A TENT. 



The tent arrangement is attended with the great advan- 

 tage that it can be removed from place to place, and can be 

 set up in situations inaccessible to a wheeled carriage. 

 In the engraving the tent is open in front, being drawn 

 so in order to allow us to see the interior; and the cloth 

 does not quite come to the ground, in order that we may 

 see the supports. In actual use it ought to be closed en- 

 tirely, except at the opening in the apparatus at the top to 

 admit the light which is to form the picture. 



The process of photography consists simply of fixing the 

 image produced in the camera obscura. The box used is 



