File:A textbook on the locomotive and the air brake (1901) (14572325378).jpg

Identifier: textbookonlocomo02inte (find matches)
Title: A textbook on the locomotive and the air brake
Year: 1901 (1900s)
Authors: International Correspondence Schools
Subjects: Locomotives Locomotive boilers Locomotives Railroad cars
Publisher: Scranton, Pa., International textbook co
Contributing Library: Northeastern University, Snell Library
Digitizing Sponsor: Northeastern University, Snell Library

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en this scale is allowed to accu-mulate, it acts as a non-conductor and prevents the currentfrom passing through, and no light can be had until it isremoved. If the copper electrode burns or melts off at theupper end, the equipment is running too fast and the speedshould be promptly reduced. When satisfied with the condi-tion of electrode 109^ a carbon should be put in by removingthe carbon holders 87 and 88 from the guide 100. After secur-ing the carbon in the holder, grasp it by the thumb andforefinger, with the remaining fingers resting on guide 100\then it can readily be put in place. With a little practice, thelamp can be trimmed in a very few moments, and in the darkif necessary. After putting in a new carbon, always push downon lever PO, Fig. 6, and notice if the carbon lifts and falls freely.If it does not lift, it is not in proper place in the clutch 44; ifit does not fall down freely, turn it around until a free move-ment is secured. A carbon should burn 8 or 9 hours. Before
Text Appearing After Image:
Fig. 6. I §14 THE ELECTRIC HEADLIGHT. 15 putting it into the lamp, examine it to see that it is smoothand free from cracks. The best carbons are none too good forthis service. REGULATING THE LAMP. 15. The tension spring 93, Fig. 6, serves two purposes;First, it brings together the points of the carbons so as toestablish the arc when the dynamo is set in motion, a completecircuit being necessary to establish a current; if the carbonsare separated but a fraction of an inch, the lamp will refuse towork, the current refusing to jump across the separation. Thepresence of oxidation or scale on the electrode, as previouslymentioned, will cause this separation of the carbons, though, toall appearances, an actual contact exists. Second, with the lampproperly trimmed, steam turned on, and the dynamo set inmotion, the spring 93 performs its second function. As the current enters the lamp and passes through thesolenoid 65, the iron magnet 64^ is draw^n down, thus providing,through the medium of

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