PHOTOGRAPHY AND PHOTOMICROGRAPHY. 



145 



on the ground glass as for any picture, reniembering 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 nuist l)e placed crosswise on the lantern-slide. The writer focuses as 



129.' 



*FiG. 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 1014 by 1254 

 by 5-}4 inches, and its weight, including lens and shutter, is about 15 pounds, or with tripod 19 

 pounds. The camera takes a 6^ by 854 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. 



