52 THE CAMEKA, ETC. 



two holes in a large American meat tin, one on a 

 level with the flame, the other in the top. In the 

 former a piece of ruby glass and in the latter a 

 crooked chimney, the same as is used for a magic 

 lantern, is inserted. The whole is placed over the 

 lamp in the box, (the sides of the tin near the bottom 

 having a few holes previously made in them, to allow 

 of the free entrance of air). 



One or two cupboards are useful, they should be 

 large enough to hold tin boxes for plates, sensitive 

 tissue, etc. 



It will be seen by the figure that, in the unoccu- 

 pied portion of the paper wall next the door, about 

 three feet from the ground, a window twelve inches 

 wide and about four or five feet long, has been cut, 

 a board two feet long the same width as the window 

 projects from its lower end into the room, where it 

 rests on a support which keeps it perfectly level. 

 Two laths or posts are erected at the dark room ex- 

 tremity of this platform, and the whole covered over 

 with newspapers and tarred paper, the same way as 

 the dark room itself; a reference to fig. 22 will ex- 

 plain this better than any words can do. 



A recess is thus formed in the wall outside of the 

 dark room. Inside the dark room in the side walls 

 of this recess, two windows about a foot square are 

 cut, and covered with sleeves of black cloth, fastened 

 at their open ends with indiarubber. 



In the partition between the dark room and in- 

 terior of the recess, between these two walls an ori- 

 fice is made, about six inches in diameter also 

 covered with a sleeve of black cloth. 



