Meadowcroft, Wm. H. (William Henry), 1853- · New York : The American Technical Book Co · leaf 80
dynamo-electric machines actuated by steamengines or other motive power, it necessarilyfollows that the alternations of the current musthave some degree of regularity. Diagramatic-ally, an alternating current is represented asshown in Fig. 15. The line A B is the zero line. The A B C of the X Rays.… … Fig. 15. Each of the waves represents one alternationeither in a positive or negative direction, and twoof these waves represent a complete double rever-sal, or cycle. The time occupied by two alternations, or acomplete cycle, is called a period, and the numberof periods per second is known as the…
X-rays
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