Richardson's handbook of projection (1927)

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MANAGERS AND PROJECTIONISTS 843 :he carbon holders are so located as to bring the positive crater in its correct location with relation to the reflector; all that is necessary is to insert a full 8" trim, bringing the ends of the carbons against the stop studs. No guage of any kind is necessary. NOTE. — To distinguish the elliptical mirror from the spherical mirror look for the name "Elflex" near the Bausch & Lomb trade mark. At the rear of the lamphouse, mounted on the shaft of handle N, is knob M and screw L, Fig. 315D, all held in place on screw shaft Q by a collar. By turning knob M you may move the positive and negative carbons, as a whole, backward ->r forward the distance of one inch, or any part thereof. IMPORTANT. — When placing the positive carbon tip in position 4J/2 or 4" from the mirror, as described, this adjustment (knob M) should be in its central position, so that if it be necessary to alter the distance of the crater from the mirror while projection is in progress, it may be moved either way by means of knob M. LUBRICATION.— A few drops of light machine oil should occasionally be applied to the slide rods on which the positive and negative assemblies move back and forth ; also to feed screen Q, Fig. 315D. The bearing for the intermediate drive should have ONE OR TWO drops of good oil every day. Oil holes are provided. Also apply a few drops of good oil to the arc control gears daily. DO NOT OVER-OIL. It does no good and makes a nasty mess. CENTERING THE SPOT.— The spot at the aperture is centered by tipping the mirror up, down or sidewise, by means of its control knobs, I and H, Fig. 315D. The correct distance of the mirror center from the spot is 22 inches for the spherical mirror and 24 inches for the elliptical mirror. STEREOPTICON ATTACHMENT.— To use the stereopticon attachment, pull the slide which forms a part of the front lamphouse wall toward you until it strikes the stop. Move the mirror holder assembly forward approximately l}i inches by means of knob and a shift lever, Fig. 315D. The shift lever must be turned slightly to the left (upward) and the rod to which the lever is attached pushed forward as far as it will go, and the shift lever returned to its normal, locking position, pointing downward. Having done these things, the mirror is in correct stereopticon position and it only remains to shove