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CH. I] TROUBLES WITH THE MAGIC LANTERN 47
loosened, or a wire may have become wholly separated from its connections.
§ 63. A fuse may have burned out somewhere along the line. Commencing with the fuse nearest the lamp, take each fuse out and examine it. Use the testing incandescent lamp also.
§ 64. A fuse plug may not be screwed in tightly enough to make good contact. Occasionally some one puts a piece of paper or wood in the fuse socket, thus preventing metallic contact. Such obstructions should be looked for and removed ; then the fuse plug can be made to produce metallic contact.
§ 65. The switches may not be properly closed, and hence the circuit is not complete.
§ 66. The carbons may be so short that they cannot be brought in contact, and thus the circuit cannot be completed. Put in new ones.
§ 67. The range of the lamp movement may be at its limit, so that the carbons cannot be approximated. This must be corrected by turning the screws back and then setting the carbons by hand, if long enough, or by putting in new carbons.
§ 68. If one uses an automatic arc lamp, it may be that the mechanism does not work. Before looking elsewhere for the trouble, one should try the hand-feed device present in all automatic lamps and make sure that the carbons are brought in contact and then slightly separated to establish the arc.
§ 69. Of course, if one uses a hand-feed lamp it will not start until one brings the carbons in contact by the proper device for the purpose. As soon -as the carbons touch there will be a flash of light; then the carbons should be slightly separated.
§ 70. There may be a short circuit in the lamp itself due to a burning out of the insulation. This may be detected by opening the double-pole knife switch slowly. If there is a big spark when the switch finally opens, a short circuit in the lamp is strongly indicated.