PHOTOGRAPHY AND PHOTOMICROGRAPHY. 



145 



on the ground glass as for any picture, remembering that a wide margin ( l / 2 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.* 



*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 ioJ4 by I2J4 

 by 5J4 inches, and its weight, including lens and shutter, is about 15 pounds, or with tripod 19 

 pounds. The camera takes a 6Vi by 8 1 A 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. 



