Excerpt from The Illuminating Engineer, Vol. 10: Jan. 1917 to Dec. 1917 The discussion on this subject at the last meeting of the Illuminating Engineering Society marks an important stage in our progress towards more scientific and definite methods of comparing sources of light. 'the origination of the Lumen, as a measure of flux of light, and as a basis of comparison of the illuminating power of sources is due to Professor A. Blondel, who first suggested the expression at the International Electrical Congress at Geneva in 1896. It is thus in no sense of German origin, as one of our contemporaries incautiously suggests. (in any case, the comment is irrelevant. The only points of importance are the convenience and scientific value of the term, irrespective or its origin.) In France, on the other hand, whence this unit originated, the Societe Francaise de Physique passed a resolution about three years ago, advocating rating on this basis and in the United States, the Illuminating Engineering Society, which is representative of gas, electricity, and all other methods of lighting, formally adopted this method of rating at the Convention held last September. It was therefore natural that the matter should receive the attention of the Illuminating Engineering Society in this country. 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.