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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136 DO AND DO NOT IN CHAPTER V [CH. V Do 1. Use a good quality of petroleum (kerosene) . 2. Keep the lamp clean, and the wicks properly trimmed. 3. Use a chimney of the proper height for the flame. 4. Turn the flame up as high as possible without having it smoke. 5. The edge of the flames should face the condenser, the middle flame being in the axis. Do 1. For gas use the best kind of mantles. 2 . Make the connections with rubber tubing of good thickness and quality or flexible metallic tubing (fig. 60). Do 1 . For acetylene use a proper burner and reflector, that is, one which is made by a reliable house that has proved its safety and excellence. 2. Use a safe gas supply, such as a house supply or a prcstolite tank is best. Do NOT 1. Do not use poor oil, it will not give a good light, and may explode. 2. Do not let the lamp get dirty or the wicks burn with tails. Clean and trim. 3. Do not use a low chimney for a large, high flame. 4. Do not turn the wicks up till they smoke. Stop just before that. 5. Do not have the face of the flame, but the edge toward the condenser. Do NOT 1 . Do not use mantles of poor quality, or that are broken. 2. Do not make connections with thin or used up rubber tubing. Do NOT 1. Do not use an untried lamp and general outfit for the acetylene light. Acetylene is a good servant but a cruel master. 2. Do not try to use a makeshift gas generator. The smell will be disagreeable and the escaping gas possibly dangerous