George Washington Patterson
Published: 2017-10-21
Total Pages: 58
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Excerpt from Electrical Measurements, Vol. 1: Elementary; Instruction Paper Physical quantities are measured in terms of quantities called units. These units, as a rule, are related to one another and form systems; as, for example, the British system and the C'. G. S. System. Fundamental Units. The arbitrarily chosen units of a system are called fundamental in distinction to the related units depending on them, 'which are called derived units. The C. G. S. System, univer sally used in electrical measurements, takes its name from three Of its fundamental units - the centimeter, the gram, and the second of mean solar time. Besides the three units from which it takes its name, the C. G. S. System includes other fundamental units; for example, the degree centigrade, the calorie, and the unit magnetic pole. Whenever the arbitrary choice Of a property Of a substance enters into the choice of a unit, the unit itself becomes fundamental. Thus' the calorie depends on the thermal capacity of water; the unit magnetic pole depends on the magnetic property of air, etc. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.