An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 526
amps anddistributes light from large diffusing surfaces,usually white ceilings and upper walls. Tn this way shadowsare either eliminated or greatly reduced in intensity and theglare of the visible filament is avoided. This is the most ex-pensive method of lighting. The semi-indirect system shields… … Fig. 333. —Semi-in-direct system usesinverted-bowl re-flectors of translu-cent glass. 472 ELECTRICITY AND MAGNETISM doubt as to the most favorable ratio of direct to indirect light,but certain experiments indicate that very satisfactory resultsare secured by making the direct component about 15…
Electricity · Magnetism
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