The So-Called International Electrical Units (Classic Reprint)

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Excerpt from The So-Called International Electrical Units The Congress also recommended the employment of the carcel as the standard for photometric comparisons. The international commission, appointed in accordance with para graph 4 of the resolutions of the Paris Congress of 1881, met at Paris in 1882, but definite action was deferred until two years later, when the following definitions were unanimously recommended: The legal ohm is the resistance of a column of mercury 1 square millimeter in cross section and 106 centimeters in length, at the temperature of melting ice. The ampere is equal to one-tenth of a c. G. 8. Unit of the electro-magnetic system. The volt is the electro-motive force which will maintain a current of 1 ampere ln a conductor of which the resistance is a legal Ohm. The value adopted for the length of the mercurial column was taken as 106 centimeters, notwithstanding that most of the best results were very close to as it was thought advisable to adopt a' value known to be true to the nearest centimeter for a period of ten years. On account of this uncertainty, no steps were actually undertaken by the various governments represented. The conference also adopted as the unit of light of any color the quantity of such light emitted in a perpendicular direction by 1 square centimeter of molten platinum at the temperature of solidification, and as the practical unit of white light the total quantity of light emitted perpendicularly by the same source. 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.