Hall's illustrated catalogue of magic lanterns, dissolving lanterns, and stereopticons : for societies, parlor entertainment, panoramas, and public exhibitions. (1873?)

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70 HALLS ILLUSTRATED CATALOGUE OF ^ ^ ^ The Improved Oxy-Hydrogen Dissolving Stereopticon. FOR PUBLIC EXHIBITIONS. No. 34 represents the Dissolving Lantern, which for beauty of design and finish, and convenience in operating, cannot be excelled. The special features are first, a single black walnut or mahogany case, lined with sheet-iron, containing two oxy-trydrogen Blow- pipes, two sets Condensers, two revolving adjustable Slide Holders, and the dissolving Stop-cock, The frames holding the front tubes have horizontal and perpendicular adjustments. The case has a door <>n each side, so thai each blow-pipe can be conveniently adjusted or examined. The top of the ease raises to allow the heat to escape. The revolving slide holders are of the most improved pattern, and will hold either the plain photograph slides or mounted >!ides !x7 in.. and will allow the slides to he shown in any position, horizontal. upright, or at any angle. V>y the use of separate upright sliding boards, in which the projecting tubes are held, either of the three si/.es of tubes may be used.