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 (14734742126).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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Text Appearing Before Image:
^ serve asone point of connection in place of one ofthe copper brushes ; but in this eventeither a wide journal must be used, or elsesome conducting substance, as plumbago,replace the lubricating oil in the bearings. Pole Changing Breaker. Fig. 22 shows a diagram of a polechanging contact breaker which will allowof rapid alternations of current. It is oper-ated by an electric motor by preference,although any motive power can be ap-plied to it. W a W b diXQ two brass wheels, the pe-ripheries of which are broken by the inser-tion of insulating blocks //, shown blackin the sketch. 5 5 are the shafts on whichthe wheels are mounted, the two wheelsbeing necessarily insulated from eachother. I, 2, 3, 4 are four brushes of cop-per pressing on the rim of the wheel andleading in the current from the battery B,
Text Appearing After Image:
Contact Breakers, 75 The primary coil is attached to the brassbody of the wheel or to the shafts. Whenthe wheel is in the position shown, the coiland battery are on an open circuit; but onthe wheel commencing to revolve, thebrushes i and 2 bear on the brass, and thecurrent flows from the positive pole of thebattery to 2 through the wheel W a to thecoil P, up through wheel W b and out atI back to the battery. The next positionof the brushes i and 2 will be on the insu-lations, and 3 and 4 will come into action.Then the positive current will reach W bby means of brush 3, and after traversingthe primary coil and wheel W a, emerge at4 to the battery, thus reversing the currentthrough P as many times as there are setsof segments, which latter can be multi-plied according to requirements. Themain point to be considered after that ofgood connections is that the brushes i and3 and 2 and 4 do not at any time touchany part of the brass wheel at the sametime, as this would short circuit the bat-

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