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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134 TROUBLES IN CHAPTER V iCn. V With the acetylene flame if too much gas is turned on the flame will smoke and roar. § 222. The image of the lamp flame may show on the screen. This is because the objective is too far from the condenser or the lamp flame is not in the proper position with reference to the condenser. Try removing the lamp farther from the condenser or bringing it nearer. When it is in the correct position its image will not appear on the screen. § 223. Roaring of the alco-radiant lamp. If the roaring is excessive it shows that the pressure on the alcohol reservoir is too great. This can be remedied by ceasing to pump the air in till the noise is within reasonable bounds.