. Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery . Fig. 19. Fig. 20. portion, it might be called—should not beover 1^ inch. The rate of motion is high ; but anerroneous notion has been taken of itsperformance by many persons in theknowledge of the writer. The rate ofvibration is not wholly dependent on the 68 Contact Breakers. size, or, rather, smallness of its spring ;the arm and armature considerably alterthis, although they are not pliable
. Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery . Fig. 19. Fig. 20. portion, it might be called—should not beover 1^ inch. The rate of motion is high ; but anerroneous notion has been taken of itsperformance by many persons in theknowledge of the writer. The rate ofvibration is not wholly dependent on the 68 Contact Breakers. size, or, rather, smallness of its spring ;the arm and armature considerably alterthis, although they are not pliable, by rea-son of their mass and the momentum con-sequent on their mass. A word here on the size of the arma-ture. It should be somewhat larger thanthe face of the electro-magnet core, andshould be thick—that is, in a circu-lar form—say one half its diameter. Ofcourse this does not apply to the steellever armature before mentioned. It isimpossible to lay down arbitrary ruleswhere the conditions are not determined,but a very small amount of experimentingwill demonstrate the correct lines onwhich to build. When in action, all rapid rheotomesgive out a definite musical note wherebythe rate of vib
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