Phosphotometre Filmograph Comparison photometer - battery operated 2.5v bulb wired through variable resistance operated through pull-out slider calibrated 0-50. Lamp seen through sliding continuous wedge calibrated 0-50 and f/f2.7-14 (Pour Pathe Baby), then through lens and reflected in 45 degrees glass through which scene is observed. Small milled knob rotates blue filter over viewing aperture. Made by Les Establishments Filmograph, 47 Rue Bangreaux, Montrouxe. (M953)