Teaching about light and sight: a handbook for classroom teachers in elementary and secondary schools
Research Division, National Education Association of the United States, 1955 - Medical - 94 pages
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12 issues adjusted altho American Medical Association American Optometric Association American School amount of illumination Angstrom units astigmatism Better Light Better brightness candle chalkboard classroom teachers color comfort contrast dark daylight defective sight desks diffusing direct sunlight dressing table effect efficiency equipment feet floor fluorescent lamps fluorescent tubes foot-candles foot-lambert give glass health education home lighting Illuminating Engineering Society incandescent bulbs inches Indirect lighting lens level of illumination Light Better Sight light meter light sources lighting units luminaires manufactured light materials measure metropia mirror National Education Association needed normal objects outlets percent placed poor portable lamps possible Practice Prevention of Blindness printed problems pupils rays recommended reflected glare reflection factor reflects light Residential Lighting retina roller shades School Lighting shadow sight and light surface thru thruout tion ultraviolet usually Venetian blinds vision walls Westinghouse Electric Corporation York