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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CH. V] MAGIC LANTERN WITH ACETYLENE LAMP 127 ends to their connections by tying a string tightly around them, if rubber tubes are used. If the supply is at a considerable distance there should be a stop-cock at the lamp to regulate the amount of gas, and to turn it off completely if desired. At the end of the exhibition the gas must be turned off at the source of supply. § 207. The management of the exhibition is simple, and should follow th3 general lines laid down in Chapter I (§ 21-41). It is not wise to try to use a screen more than two to three meters square (6-9 ft.), and one must keep in mind the requirements for feeble lights (§ 193). THE MAGIC LANTERN WITH AN ACETYLENE LAMP § 208. Source of acetylene. — This may be from a house supply, a special generator, or from a tank or cylinder of acetylene dissolved in acetone under pressure (prestolite tank). § 209. Acetylene lamp. — The burners now used are in pairs. Two jets set at an angle give a fused, flat flame. For the magic lantern the lamp has from one to four of these twin burners in a line. Behind the burner is a concave reflector returning the backward reflected light to the burner and from thence on to the condenser, so that as much of the light as possible is utilized for the screen image (fig. 70). § 210. Position of the concave mirror. — If a concave mirror is used to save the light extending away from the screen, its center of curvature should coincide with the flame of a single burner, or its center should be at the middle flame, if there are several burners in a row. FIG. 70. DOUBLE-JET The acetylene flame is very transparR^K™oRLTo'R "HE «it, so that a mirror behind the burner MAGIC LANTERN. will increase the light nearly the theo retical amount (75%) while with nearly