Transactions of the Illuminating Engineering Society Volume 3 - Softcover
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...on the cashier's eyes, while the boot-black stand requires a special lamp. It is very desirable to place a lamp so that men can read with comfort while having their shoes shined. Mr. Allen.--I have made provision for one 60-watt tungsten lamp near the cashier's desk. At the boot-black stand the illumination averages at least 2.5 foot-candles, and considering the reflection from the walls, it would seem that there is no need for an extra lamp at this place. In regard to the use of four large main lighting units instead of a larger number of smaller units, it should be noted that when there are many lighting sources the retina of the eye contracts and hence the smaller the number of units the better the real illuminating efficiency. The particular units chosen give a good light distribution for illuminating the floor. The absorption is somewhat greater than with opal reflectors, but the real illuminating efficiency is improved by the reduction in intrinsic brilliancy. By using clear lamps the loss of useful life due to frosting has been avoided. The fixtures are so designed that a current of cool air drawn in at the bottom of the shades is brought in contact with the lamps and passes out through an opening in the fixture casing. Tests have shown that the temperature rise is well within safe limits. Mr. W. H. Blood, Jr.--The form of window lighting proposed by Mr. Daggett does not appeal to me. Fully 30 per cent of the light is lost by the use of ground glass. Equally as good effects, and in many ways a superior lighting, can be obtained by means of green shades placed close to the window so that no light will be thrown in the eyes of people on the street. In this way intense light would be obtained on the merchandise in the window. Mr. F. E. Smith.--I ask Mr....
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- PublisherRarebooksclub.com
- Publication date2012
- ISBN 10 1130451739
- ISBN 13 9781130451733
- BindingPaperback
- Number of pages248
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