H. X| PHOTOGRAPHY AND PROJECTION 383 Fig. 217A. 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 tand between the source of light and the camera to protect the camera and he eyes of the operator. Opposite the light source is an opening with a'shutter 'he source of light in this case is a kerosene lamp.