The Röntgen rays in medical work (1899) (14570209410)

Identifier: rntgenraysinmedi00wals (find matches)

Title: The Röntgen rays in medical work

Year: 1899 (1890s)

Authors: Walsh, David

Subjects: X-rays Radiography X-Rays Radiography

Publisher: London : Baillière, Tindall and Cox

Contributing Library: Francis A. Countway Library of Medicine

Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

Text Appearing Before Image:

Fig. 8.—Secondary Battery. b. Dynamos This method of obtaining the electric current is open to thosewho have access to either a private or a public lighting supply.The continuous or low tension current, which is sent into the 26 THE RONTGEN RA YS IN MEDICAL WORK house with a voltage of 100 to 250 volts, is most convenient forrunning the induction coil. In order to reduce it to the necessarypressure—10 or 12 volts—a resistance coil, or a rheostat, must beplaced in the circuit between the source of supply and the coil,and the wires should be attached to the ordinary terminals on

Text Appearing After Image:

Fig. 9.—Schalls Rheostat. the coil. A most complete rheostat has been made by Mr.K. Schall for Dr. Macintyre, of Glasgow (see Fig. 9). By itsmeans the number both of volts and of amperes can be adjustedat will. This admirable rheostat furnishes a most satisfactorymeans of working the coil, and one that is cheaper and moreconvenient than any system of batteries. ELECTRICAL APPARATUS AND METHODS 27 Of the above-mentioned appliance Dr. Macintyre writes : Theadvantages of this rheostat are very great, because we can arrangethe number of volts and the number of amperes for any size ofcoil from the 2 to the 18 inches spark. My work has not onlybeen greatly facilitated by means of this new arrangement, butsparking across the platinum point of the contact-breaker has beendiminished, and the risks to the Crookes tubes have been con-siderably lessened, while the steadiness and constancy of currenthave been assured—points of great importance, as any fall ineither amperage or voltage, as indi

Die Röntgenstrahlen in der medizinischen Arbeit 1899 Buchillustrationen Medizin medizinische Illustrationen Krankengeschichte Geschichte der Technologie elektrische Energie Elektrizität Röntgen röntgen Bilder aus dem Internetarchiv

1899

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