The method of fixing and the manner of controlling the blinds in the roof oe a photographic studio depend upon the position of the studio and on the quality of the light. The blinds should be of two kinds: those next the glass should be of thin calico, the outer ones of green sateen or glazed lining. Spring rollers, provided they are properly fixed and used, give the most satisfactory method of control. Sometimes two wires are stretched across the studio and the blinds are festooned between them, but such an arrangement is very objectionable : the blinds collect dust, cannot easily be shifted, and look very untidy. A trood and cheap method is to fix the blind on a rolier with a pulley and cord at one end, and a cord from the centre of the bottom. Pulling down the blind winds up the cord, and pulling down the cord winds up the blind.