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

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MAGIC LANTERNS, STEREOPTICONS, ETC. 7 Hail's Oxy-Calcium Stereopticons fop Dissolving Views. With a Stereopticon Dissolving- View Apparatus, the dissolving effect is produced by slowly turning the stop-cock in the middle of the arched tube, which supplies the oxygen to the two sides of the instrument. No. 3. No. 3. Oxy-Calcium Stereopticon for Dissolving Views, two japanned tin cases each 10^ inches long by 6^ inches wide and 16J- inches high, extra line plano-convex condensing lenses 4 inches diameter, concavo-convex magnifying lenses 2 inches diam- eter, giving high arid low power, brass rack adjustment for focus- ing, Hall's Improved Oxy-Calcium Lamp, brass dissolving stop- cock for producing the dissolving effect, twelve feet gum tubing, India-rubber gas bag 40 inches long by 30 inches wide, with brass stop-cock, copper retort, and metal pipe for making oxygen gas, glass wash bottle with brass screw top, tin spirit lamp to heat retort, iron retort stand, one dozen lime Cylinders, all packed in a neat wood box, with lock and key, and handles. Price, $100. We will recommend No. 3 to be the very best instrument that can be purchased for the price ; they are perfectly safe ; can be operated in the parlor without the least danger.