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Bausch & Lomb Optical Company Simplex Regular Equipment Mechanism —Enclosed, fire and dust-proof, with hinged doors and large obser- vation window; intermittent movement of Geneva type, consisting of star and cam operating in box filled with oil; movement perfectly balanced; practically all gears are cut from cast iron, tool steel and phosphor bronze; least number of gears employed and these are placed in center line position; only two operations required in threading; lens holders always absolutely parallel to aperture plate; take-up of simple, rigid design driven by belt or chain from main driving gear. Fire Shutter —Controlled by centrifugal governor; operates without springs or rollers. Magazines —New standard, drawn in two pieces from No. 18 gauge steel; 16 in, inside diam.; accommodate 2000 ft. reels; equipped with improved, malleable iron strap hinges, 7/4 in. wide; self-closing doors with spring latch and 3 x 4x /4-in. wire glass window in upper magazine. 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 required. Lamp House —Of best Russia iron; ample in size to permit perfect ventilation and heat radiation; metallic screens shield ventilating holes at top and bottom; condenser mount permits expansion and contraction without danger of breakage; lamp can be withdrawn from back of lamp house, making all parts readily accessible; accommodates 12-in. upper and 6-in. lower carbons; complete with sliding ways, slide carrier, etc. Arc Lamp —Has eight adjustments—six operated from back of lamp house; remaining two, for altering angle of carbon, are operated from inside. Rheostat and Switch —Enclosed 110-volt rheostat, grid type, adjustable 25-45 amperes; 60-ampere, double pole, knife switch enclosed in steel box. Stand —Heavy cast iron, adjustable pedestal, complete with lag screws; furnished in two heights—39 in. or 47/4 in. from floor to center of lens. Complete catalog on request. 95