CH. Xj 



PHOTOGRAPHY AND PROJECTION 



383 



FIG. 2I7A. VERTICAL CAMERA WITH METAL SHIELD. 

 (From the Transactions of the Amer. Micr., Soc., Vol. XXIII, 1901). 



The camera is on a low table and a shield of sheet zinc or roofing tin is on a 

 stand between the source of light and the camera to protect the camera and 

 the eyes of the operator. Opposite the light source is an opening with a shutter 

 The source of light in this case is a kerosene lamp. 



