File: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 (14777620903).jpg

Identifier: inductioncoilsho00schn (find matches)
Title: 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
Year: 1901 (1900s)
Authors: Schneider, Norman H. (Norman Hugh)
Subjects: Induction coils Radiography X-rays Radiography
Publisher: New York : Spon & Chamberlain London : E. & F.N. Spon
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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-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 vibration can be determined.Reference to any work on acoustics willshow a table of the number of vibrationsnecessary to produce any stated musicalnote. The foregoing style of rheotome Contact Breakers. 69, forms the basis of very nearly all thosewhich are in use. The shorter and stoutera spring- the more rapidly will it vibrate,and vice-versa. Carrying- out this rule,we can manufacture an instrument which
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Fig. 21. will give as high as 2500 vibrations persecond (Fig. 21). The armature y^ is a piece of flat hardsteel bar i X i inch, held rigidly on themetal support vS and just clearing the up- 70 Contact Brcakc7s. per surfaces of the magnet cores C. Theadjusting screw Pshould be provided withan arm, B B, whereby the rotation of it canbe delicately varied. This screw mustalso be firmly held or the high speed ofthe armature will jar it loose. A check-nut on each side of the frame carrying itshould be provided in ever)^ case. Thenecessary platinum contact can be ham-mered into a hole drilled before the arma-ture is hardened. The proper place forthis contact is about one fourth of the totallength of the armature from its support,although in the simple contact breaker it canbe placed at the distance of one third if de-sired. The reason is that the concussionof the adjusting screw dampens the freevibration, and the amplitude thereof is less-ened in addition to the counter vibrationsof the scre

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