File:The electro-therapeutic guide, or, A thousand questions asked and answered (1907) (14776719371).jpg

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Induction coil and electrolytic interrupter for X-ray machine

Summary

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Description
English:

Identifier: electrotherapeut00benn (find matches)
Title: The electro-therapeutic guide, or, A thousand questions asked and answered
Year: 1907 (1900s)
Authors: Bennett, Homer Clark, 1865-1928
Subjects: Electrotherapeutics Electricity in medicine Ohm's law X-rays Electricity Electricity X-Rays Electromagnetic Phenomena Electric Stimulation Therapy
Publisher: Lima (Ohio) : Literary Dept. of the National College of Electro-Therapeutics
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Description:
English: An induction coil and electrolytic interrupter for powering early Crookes X-ray tubes at the turn of the century. The induction coil (top) produced continuous pulses of high voltage in the range 5 - 30 kilovolts, which were applied to the X-ray tube's electrodes (not shown). The high voltage ionized the residual gas in the tube, creating cathode rays at the cathode electrode which were attracted to the anode. When they struck it they created X-rays. The Wehnelt or electrolytic interrupter (cylinder at bottom) in the primary circuit broke the current to the induction coil's primary winding several thousand times per second, creating the flux changes which induced high voltage in the secondary winding. It consisted of a short platinum needle cathode immersed in a dilute sulfuric acid solution, with a lead plate anode immersed next to it. At the surface of the cathode, hydrogen ions are reduced, continuously forming tiny gaseous hydrogen bubbles which break the circuit, interrupting the current. Since each break of the primary current created a pulse of high voltage in the coil, generating a pulse of X-rays in the tube, the more breaks per second the more X-rays were produced. Wehnelt interrupters were preferred for X-ray units since they could produce far more breaks per second than mechanical interrupters. The dial at left is probably a rheostat to adjust the primary current.

Text Appearing Before Image:
solid or plasteredwalls intervene between the machine and the dark room, they should bekept in a box lined throughout with lead. When ready to make radio-graph close dark room, take plate from the box and place, film side up, inthe black envelope and this in turn in the pink envelope. The film sideof the negative should always be in contact with the smooth side of theenvelope. Place the negative on the the table, film side up. If the tableis padded, a board must be placed under the plate to prevent breakage. Ifthe weather is hot and patient is sweaty, lay a piece of blotting paper overthe outer envelope. See that your apparatus is in perfect order. Placeyour patient in the best possible position to bring out the abnormalitylooked for. For the development of plates, see the literature accompanying same. There is much to be learned which cannot be taught, but which willcome to you as you go along, as the result of your own observations andexperiments. 166 THE EIvHCTRO-THERAPEUTlC GUIDE
Text Appearing After Image:
X-Ray induction coil, with electrolytic interrupter. The above cut shows a form of high tension X-ray induction coil, withan electrolytic interrupter, for use with the alternated street current. Thisis one of the best coils for this purpose, and will do almost instantaneousradiographic work. Magnetisation What is magnetism and magnetisation? Magnetism is a co7idition so closely allied to the conditio7i of electricity,as to be inseparable, and the phenomena of manifestation of both condi-tions are very similar, and in some ways follow the same laws. The force manifestation of the condition of electricity is known aselectrification. The force manifestation of the condition of magnetism is known asmagnetisation. What are magnets? There are two kinds of magnets, viz: The natural magnet, which isknown as the lodestone, found free in nature, and the artificial magnets, inwhich the peculiar properties of magnetisation are artificially induced.Further there are two kinds of artificial magnets

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https://www.flickr.com/photos/internetarchivebookimages/14776719371/

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(Reusing this file)		 At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Flickr tags
InfoField
  • bookid:electrotherapeut00benn
  • bookyear:1907
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Bennett__Homer_Clark__1865_1928
  • booksubject:Electrotherapeutics
  • booksubject:Electricity_in_medicine
  • booksubject:Ohm_s_law
  • booksubject:X_rays
  • booksubject:Electricity
  • booksubject:Electromagnetic_Phenomena
  • booksubject:Electric_Stimulation_Therapy
  • bookpublisher:Lima__Ohio____Literary_Dept__of_the_National_College_of_Electro_Therapeutics
  • bookcontributor:Francis_A__Countway_Library_of_Medicine
  • booksponsor:Open_Knowledge_Commons_and_Harvard_Medical_School
  • bookleafnumber:168
  • bookcollection:medicalheritagelibrary
  • bookcollection:francisacountwaylibrary
  • bookcollection:americana
Flickr posted date
InfoField
29 July 2014

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