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Bausch & Lomb Optical Company Edison Kinetoscope Model D Mechanism —Intermittent movement of massive construction; all parts subjected to severe wear are of unusual size, made of tempered tool steel and provided with hardened steel bearings; driving gears protected by pressed-steel guard; three sprockets are of polished steel, supplied with tension rollers of polished, case-hardened steel, giving tension where required and preventing drag on the film; only the film margins come in contact with the machine; chain take-up attachment provides even tension; positive system of oiling through a series of tubes. Fire Shutter —Positive in action; automatically closes when speed of mechanism falls below a fixed point. Magazines —Of Russia iron; contain reels up to 12 in. in diam.; double aluminum rollers, between which the film passes, reduce wear and prevent any flame from entering the magazines. Objectives Bausch & Lomb motion picture projection lens of highest grade; Bausch & Lomb Balo projection lens for stereopticon attachment. When ordering, be sure to state projection distance and size of picture desired. Lamp House —Of new design, large and well-ventilated; has square condenser holders and patented back which permits the arc lamp adjusting buttons to be moved to any position; condensers mounted in flat metal carriers and secured in position by tension springs; lamp house provided with liberal lengthwise and lateral adjustments; accommodates 12-in. upper and 6-in. lower carbons; provided with observation window and has no open slots. Arc Lamp Rack and pinion type for use on direct or alternating current; pro- vided with all necessary adjustments; accommodates % to %-\n. diam. carbons. Rheostat and Switch Grid type rheostat for direct or alternating current; rheostat switch contacts and binding posts are inside the sheet metal frame; large switch is double pole, knife type of ample capacity, mounted on slate base; heavy Russia iron cover with fiber bushings where connecting cords enter; by mounting on a second cast-iron base which slides under Model D baseboard, the connecting cords between lamp and rheostat are permitted to remain permanently attached to the switch. Stand— Metal baseboard with flanges and five adjustable, nickel-plated legs, the four outside having floor sockets with set-screws. Complete catalog on request. 91