Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 58
Fig. 6.—EarlV fourt .-^laiiuu : iP of E-Tungsten lamps. Average illuminatiuu oversquare foot. Cousuinptiou UO watts per … Fig 7.—View looking up Escalator. The lamps are screened by horizontal groundglass slabs so that people descending do not see the source uf light. The staircase wasmoving -when this view was taken, and the steps (at the sidesj therefore cannot be seen. DISCUSSION. 39 metliod employed on the…
Lighting
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