Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

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72 MAGIC LANTERN WITH ALTERNATING CURRENT [Cn. II / The first element of the condenser consisting in a meniscus lens next the arc lamp and a plano-convex lens. 2 Plano-convex lens toward the lantern slide. The lenses of this condenser should be arranged as here shown. Objective The projection objective. c The optic center where the rays from the condenser should cross when the objective is in focus. Base Board The board bearing the track and the blocks for supporting the different parts. Block i, Block 2, Block j The blocks supporting the arc lamp, condenser and objective. Rods The rods or tubes on the base-board and serving as a track for the blocks to move upon. § 108. Arc lamps for alternating current. — These are almost invariably of the hand-feed type. Lamps are made to hold the carbons: (i) at right angles (fig. 1-3); (2) inclined backward 30 degrees (fig. 23, 39); (3) converging in the form of a V (fig. 23 D); or (4) even in a vertical position (fig. 22). Each form is best adapted to some special purpose. With carbons of the same size and composition both carbons burn away at the same rate, and therefore must be fed forward at the same rate. If the carbons are of different size or material, then the mechanism must be adjusted to move the two at a rate which shall hold the ends at the same level. § 109. Fine adjustments for the lamp. — As indicated for the direct current arc lamp (§ 10), there should be some means of moving one or both carbons separately to compensate for any unequal burning. There must also be some means of raising and lowering the lamp and moving it sidewisc so that any slight variations of the source of light from the axis may be corrected (§ 10, fig. 3). § 110. Lamp-House. — There should be a well ventilated metal lamp-house of good size and with large doors, so that all the apparatus within can be easily got at. There should also be a good sized window (say 5 cm., 2 in. square) glazed with smoky mica or a combination of green and red glass or some smoked glass of sufficient depth of tint for the protection of the eyes. This window