PHOTOGRAPHY AND PHOTOMICROGRAPHY. 



145 



on the ground glass as for any picture, remembering that a wide margin (^ inch or 

 more) must be left for binding strips, and that if the negative has any up and down 

 its image must be placed crosswise on the lantern-slide. The writer focuses as 



Fig. 129.* 



*Fic. 129. The modified Collins-Brown camera used with tripod for natural-size pictures. 

 Heavy shadows are dissipated by using the glass plate. The size of the camera box is IO}4 by I2J4 

 by SJ4 inches, and its weight, including lens and shutter, is about 15 pounds, or with tripod 19 

 pounds. The camera takes a 6j4 by 8J4 plate. It is solidly constructed, of the very best workman- 

 ship, and the only objection is its weight, which is no disadvantage in laboratory use. It is not 

 recommended for field use. 



