Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

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CHAPTER III. MAGIC LANTERN TO BE USED ON THE HOUSE ELECTRIC LIGHTING SYSTEM § 120. Apparatus and Material for Chapter III : Suitable room and screen (Ch. XII) ; Magic lantern with lamphouse and lantern table; Arc lamp for small carbons (§ 127); Rheostat (§ 129); Flexible cable for connecting the lamp and rheostat with the house lighting system (fig. 40) ; Separable plugs and extension plugs (fig. 49-50); Polarized plugs (fig. 48-49); Nernst lamps (fig. 54-55); Objective shield (fig. 14); Concentrated filament, Mazda lamps (§ 136); Flash-light; testing lamp, screw drivers and pliers; lantern slides, etc., as in Ch. I. § 121. For the historical summary of the use of the house, electric lighting system for the magic lantern, see the Appendix. For works of reference see § 2 . Consult also the Microscopical Journals, and the catalogues of manufacturers of projection apparatus. MAGIC LANTERN WITH SMALL CURRENT ELECTRIC LIGHTS FOR LABORATORY AND HOME USE § 122. For public exhibitions and large lecture rooms special electric wiring and large current arc lamps are necessary, as described in Ch. I, II and XIII. For small audiences as in laboratories and for home use, where less than 100 people are usually present, very satisfactory results may be obtained by means of lighting apparatus drawing current from the ordinary house lighting system ; and the electric current may be direct or alternating. § 123. Kinds of lamps to be used with small currents. — There are three forms of lamps which have been successful for use with the magic lantern drawing current from an ordinary lighting system : (i) An arc lamp of small size using small carbons, i. e. carbons of 6 to 8 mm. (% to 5/ie in.) in diameter. A large arc lamp is equally available if it has long clamping screws, bushings or 78