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Bausch & Lomb Optical Company Powers’ Cameragraph No. 6B Mechanism —Intermittent movement of original design and large size; gives long period of rest and easy, rapid transition; frame is heavy and rigid; gears of large diameter and wide face with spirally cut teeth; larger gears are of anti- friction phosphor bronze; all parts perfectly interchangeable; picture is framed without altering relation between aperture, projection lens and revolving shutter; three sprockets of case-hardened steel, specially selected; rollers hold film on sprocket without pressing on film; special attachment automatically resets lower loop. Fire Shutter —Simple in construction; positive in operation; supplied with upper and lower film shields which protect film practically throughout its course from upper to lower magazine. Magazines —Fire-proof, 14 in. square; heavy gauge, Russia iron boxes equipped with patented film valves through which no flame can pass; patent take-up device maintains same tension regardless of quantity of film on reel; take-up has chain drive, belt drive optional. 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 extra heavy Russia iron; large and well ventilated, with hinged cover to direct hot air away from operator; back practically all enclosed and adjusting rods of arc lamp have universal joints to permit their passing through smallest possible openings; complete with condensers, sliding ways, slide carrier, etc. Arc Lamp— Rack and pinion type; provided with every possible adjustment, all reached from outside the lamp house; accommodates Y& to Y-\n. diam. car- bons, the upper 12 in. long, the lower 6 in. Rheostat and Switch —Grid type, well ventilated, for direct or alternating current; switch of double pole, single throw type and 60 amperes capacity; provided with heavy slate base, heavy Russia iron cover and bushings for protection of wires. Stand —Cast iron stand, properly braced and with adjustable, nickel-plated legs and set of four floor sockets. Complete catalog on request. 93