Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 364
intended for 2,000, 3,000, and 4,000 c.-p.lamps, and it will be readily understoodthat some means of softening the lightfrom such powerful sources is oftendesirable. The same firm send us a rojirint of_[tlioletter from Mr. J. C. Van Goetham,recently contriljuted to The Gas World.on the subject of… … THE ILLUMINATING ENGINEER. I THE l)olopl)dtte Cumeter. The simple, portable, and accurate apparatus formeasuring illumination, surface=brightness, or re-flecting power. Can be carried from place to place with the easeof a small hand camera. Dimensions only 5| x 4| x If; case and accumu-lator…
Lighting
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