100 Burling — Photographing Fossils by Reflected Light. 



nate distortion, the back of the camera is then revolved through 

 an angle corresponding to that indicated by the scale on the 

 specimen rack, the lens is replaced, and the specimen is focused 

 and photographed. The best results have been obtained with 

 lenses having a focal length of at least six or seven inches, or 

 long enough to eliminate any errors arising in the adjustment 

 of the camera. , 



Figure 1 is a plan of the camera showing its arrangement. 

 The light used is a screened arc lamp, suspended by a pulley 

 from the ceiling, the camera stand is movable, and the speci- 

 men rack and the back of the camera are each free to move 

 through an arc of 60 degrees. The box-like projection Into 

 which the bellows may be compressed has been cut away to 

 increase the angle through which the back of the camera may 

 be revolved. 



