Light, photometry and illumination : a thoroughly rev. ed. of ''Electrical illuminating engineering'' (1912)
Barrows, William Edward, 1878-1960 · New York ; London : McGraw-Hill Book Co. · leaf 228
N CALCULATIONS 213 with low ceilings one often is compelled to introduce the morecomplicated illumination curves if small lamp units are not avail-able or too expensive in their total cost. Otherwise the tests show that it is possible to meet the theo-retical requirements with the existing sources… … FlG. 4 B 12 16 30 24 28 32 3ti 40 11 IS 52 56 6U 64 ^ Feet 119.—Uniform illumiuatiou by two enclosed arc lamps, d/h = 4. nation of very large areas, such as streets, public squares, etc.,by arc lamps especially adapted for that purpose. The enclosedarc lamps, for instance, curves of which are shown…
Light · Photometry · Electric lighting
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