File:X-ray manual - U.S. Army (1917) (14570642938).jpg

Identifier: xraymanualusarmy00unit (find matches)
Title: X-ray manual : U.S. Army
Year: 1917 (1910s)
Authors: United States. Surgeon-General's Office American Roentgen Ray Society
Subjects: X-rays Fractures Teeth Chest Heart Radiography
Publisher: New York : Middleditch
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Text Appearing Before Image:
Fig. 1. Generator on open circuit.
Text Appearing After Image:
/<7 Ohms B VWWWh D c .9 Ohm Fig. 2. Simple electric circuit. 15 1G X-RAY MANUAL—U. S. ARMY age. The conducting quality of a wire is expressed inohms, the ohm being a purely arbitrary standard. Units. Electric current or the charge transferred per second,—is expressed in amperes for large currents, and in 1/1000amperes, or milli-amperes, for small currents. Voltage,—expressed in volts for moderate voltages, andin kilo-volts for large voltages. Thus, 5500 volts =5.5 K.V. Resistance,—expressed in ohms as a rule. Electric Circuit. An electric circuit consists of some sort of a generatorand a more or less complex conducting path between itsterminals. Electricity outside a generator always passesfrom high to low voltage, and the current may properlybe said to lose voltage en route from one generator ter-minal to the other. Consider a very simple circuit, Fig. 2, consisting of agenerator, G; generator resistance one-tenth ohm, twoother resistances as shown. The fundamental law ofs

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