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File:Traité de radiographie médicale et scientifique - cours libre professé a l'écolepratique de la Faculté de Médecine de Paris, deuxième semestre de 1896-1897 (1897) (14755761494).jpg

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Identifier: traitderadiograp00fove (find matches)
Title: Traité de radiographie médicale et scientifique : cours libre professé a l'écolepratique de la Faculté de Médecine de Paris, deuxième semestre de 1896-1897
Year: 1897 (1890s)
Authors: Foveau de Courmelles, François Victor, 1862-
Subjects: X-rays X-Rays Radiography
Publisher: Paris : Octave Doin, Éditeur
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Fig. 32. — Courants triphasés radiographiques (Breton). soient suffisamment éloignées pour éviter toutes déchargesentre elles. Au point de vue industriel où les courants ne dé-passent guère 10.000 volts, ces précautions seraient inu-tiles, mais elles sont indispensables en radiographie, comme 68 LES SOURCES DÉNERGIE ÉLECTRIQUE pour les décharges électriques multiples et rapides des con-densateurs qui constituent la haute fréquence (dArsonval,Tesla). Ces courants à décharges extrêmement rapides Tr^ OTr
Text Appearing After Image:
Fig. 33. — Transformateur à haute fréquence. peuvent aussi servir de transformateurs pour la radiographie(fig. 33), et nous les étudions plus loin. TRANSFORMATEURS MEDICAUX Au sens absolu du mot, le terme de transformateur pour-rait sappliquer à un accumulateur ou à un appareil quel-conque dinduction, bobine..-. En principe, un transfor-mateur h courant continu; est un moteur actionnant unedynamo; mais, dans la pratique, on superpose les deuxenroulements induits sur la même carcasse, ce qui réduitles couples mécaniques et améliore le rendement. On peutarriver à rendre ce dernier de 80 à 85 0/0 (expériences delusine de Chelsea, 1890). Ces transformations peuventservir au médecin à utiliser le secteur à 110 volts etquelques dixièmes dampère,soit pour donner quelques voltset 20, 30 ou 40 ampères nécessaires à la pyrogalvanie, soità fournir les 1-0 ampères et 20 volts généralement néces- TRANSFORMATEURS MÉDICAUX 69 saires aux bobines moyennes employées en radi

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  • bookid:traitderadiograp00fove
  • bookyear:1897
  • bookdecade:1890
  • bookcentury:1800
  • bookauthor:Foveau_de_Courmelles__Fran__ois_Victor__1862_
  • booksubject:X_rays
  • booksubject:Radiography
  • bookpublisher:Paris___Octave_Doin____diteur
  • bookcontributor:Francis_A__Countway_Library_of_Medicine
  • booksponsor:Open_Knowledge_Commons_and_Harvard_Medical_School
  • bookleafnumber:87
  • bookcollection:medicalheritagelibrary
  • bookcollection:francisacountwaylibrary
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

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