Excerpt from Report of the 63rd National Conference on Weights and Measures, 1978 Man has only recently studied and independently generated this type of energy through -his technological achievements. In 1873, James Cavendish, an eminent British scientist, postulated the exist ence of EM radiation. This paper addresses EM energy only in the lower frequency (longer wavelength) portion of the electromagnetic spectrum, from electric power through microwave frequencies. This region of the spectrum is referred to as non-ionizing radiation or safe radiation as distinguished from x rays, gamma rays, and cosmic rays at much higher frequencies. These longer waves in the lower frequency part of the EM spectrum cannot be smelled, tested, felt, seen, and only in rare cases heard. 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.