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48 TROUBLES WITH THE MAGIC LANTERN lCn. I
Unless one has considerable knowledge of arc lamps it is advisable to get an electrician to repair the lamp.
Short circuiting in the lamp is a rare trouble and less liable to occur than almost anything else.
GOING OUT OF THE LAMP
§ 71. This may be due to the stopping of the dynamo.
§ 72. A fuse may burn out somewhere along the line.
§ 73. Some connection may burn out or one or both wires may be disconnected.
§ 74. The carbons may have burned off so that the interval between the ends is too great for the current to pass. This is a very common cause, and is, of course, easily remedied by the use of the feeding screws of the lamp to bring them closer together. If the carbons are so short that they cannot be brought together, new carbons must be inserted. Always open the table switch before putting in new carbons.
Sometimes the screw holding the lower carbon is not set up enough and the carbon falls down. If this is the trouble open the table switch and replace the lower carbon in its proper position and tighten well the set screw holding it.
Always look at the carbons first in case the lamp goes out unexpectedly (see also above § 66-67, 7° and a^ the causes for no current § 61-70).
NOT ENOUGH CURRENT
§ 75. There may not be enough in the line.
§ 76. The line may be grounded. Test for this with the testing incandescent by touching one of the terminal wires of the incandescent to some metal object connected with the ground, like the metal tube enclosing the wires, a water or gas pipe or radiator, and the other to one of the exposed metal parts of the conductors, first on one side and then on the other. If there is a connection of either wire with the ground the testing lamp will light when its two wires are connected, one with the radiator, etc., and the other with