Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 281
ounds,for if the illumination falls much belowthis value a profound change takesplace in the retina ol the eye. and weapproach the condition known as night-vision when the eye is in a state ofinstability, and finds it very difficult todistinguish Burrounding obje< ts, current by means of a… … PORTABLE DISPLAY PANELS FORWALL FIXTURES. A i number of the Electrical World describes an appliance for exhibitingelectric wall fixtures. This takes the formof a movable easel which can be set upat any place in the showroom to suitthe customei - convenience. The fitis mounted on the easel Burface,…
Lighting
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