File:Radiography and the 'X' rays in practice and theory - with constructional manipulatory details (1898) (14755712524).jpg

Identifier: radiographyxrays00bott (find matches)
Title: Radiography and the 'X' rays in practice and theory : with constructional manipulatory details
Year: 1898 (1890s)
Authors: Bottone, Selimo Romeo
Subjects: Electric radiation X-rays X-Rays Radiography
Publisher: London New York : Whittaker & Co.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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ts, and capable of delivering acurrent of from 11 to 20 amperes, would work eitlier of theabove-mentioned coils well; and it would be advisable tohave in coiniection with it a switch to cut off the current,and a gi-aduated resistance in order to be able to regulatethe amount of current sent through the coil, and thusobtain the best results without endangering the insulationof the coil. Such a dynamo would require about ^ h. p.to drive, and would be found perfectly satisfactory inpractice. It would not be advisable to emj^loy theordinary dynamos used for lighting, since usually theirvoltage is much too high, so that without a proper sliding CHOICE OF SOURCE OF CURRENT m resistance, the value of which would have to be ascertainedby testing the voltage of the dynamo and the resistanceof the primary of coil, there would be great risk of breakingdown the insulation of the latter. § 32. It is i)ossiblc and sometimes convenient to worka coil with a current supplied by an alternating dynamo.
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Fk;. IJ.—Tesla Transformei;. In this case the clapper or vibrating hammer must beretained against the contact screw by placing a slice ofcork, of sufficient thickness, between the hammer headand the coil core. It is even more essential in using analternating current that a sufficient resistance shouldbe used in circuit wuth the dynamo and coil than is thecase when a continuous current dynamo is employed. GO liADIOaRAlllY Personally, the author has never found the alternatingdynamo vury satisfactory when used in conjunction withthe coil. Iliis is prohahly due to the fact tliat the ^>V^^;X

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