The Illuminating Engineer, Vol. 10: Jan. 1917 to Dec. 1917 (Classic Reprint) - Softcover

Inhaltsangabe

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 Société 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.

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