Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 62
Fig. 2.—Searchlight with special Venetianblind signalling shutter; 150 amperesmirror 43 inches (approx.) diameter. … Fk;. 4. Small Stage Searchlight rnounted ontripod. I2:inch mirror. 20 amperes. 56 THE TLLmiTXATtXr; ENGTXEER (feb.; fracture when ]ieatiiig or cooling owingto the unequal thicknesses of glass, and.for the same reason, was apt to intro-duce prismatic colours in the edges ofthe beam. Improvements in…
Lighting
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