Identifier: principlesofelec00mati (find matches)
Title: Principles of electro-medicine, electrosurgery and radiology : a practical treatise for students and practitioners. With chapters on mechanical vibration and blood pressure technique
Year: 1917 (1910s)
Authors: Matijaca, Anthony
Subjects: Vibration Electrotherapeutics X-rays Blood pressure Electric Stimulation Therapy X-Ray Therapy Electrosurgery
Publisher: Butler, New Jersey Tangerine, Fl. New York City : Published by Benedict Lust
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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3lion5TerMinute. Fig. 7—^The above tracings represent tlie rise andfall of voltage and comparative duration of flow ofthe various low potential currents and modalities.The zero line represents the neutral line; above zerois the positive direction; below zero, the negative. 34 Anthony Matijaca CHAPTER V STATIC ELECTRICITY 5TATIC, or Franklinic electricity, is a unidirectional current, inwhich the voltage is enormous, while the amperage, on account ofits oscillatory or vibratory character, is infinitesimally small(usually only 0.20 to 5 milliamperes).There are two types of machines producing static charges—one thefriction, and the other the influence machines. The friction machines
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Fig. 8—Static Machine (Holtz type) with Ley-den jars, platform and electrodes. were the earliest type, and the electricity was produced by rubbing arevolving disc of glass or sulphur with the hand or a cushion. At present, all static machines used for therapeutic purposes are in-fluence machines of the Holtz, Toepler-Holtz, or Wimshurst type, andconsist of two essential parts: one for producing electric charges andthe other for collecting them. Electric charges are produced by means of plates, inductors, car-riers and neutralizing brushes. These charges are then collected bycollecting brushes, and are carried to the discharging poles or primeconductors. Machines of the Holtz and Toepler-Holtz type have a number of Electro-Medicine, Electro-Surgery and Radiology 35 stationary and a number of revolving glass plates, while in the Wims-hurst machines all the plates (which may be of glass or mica) are re-volving (some in one direction and some in another). The stationary plates in the Ho

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