Modern lighting : examples of its successful application in the industries. (1920)
National Lamp Works of General Electric Co. Engineering Department. · National Lamp Works of General Electric Co. Engineering Department · leaf 44
I *. » t I •■. J . ■» ■ I … IMATF, TWENTY TT - ■ — LIGHT MEASUREMENT A T the time that the new interest in hght- ing was just beginning to be felt, came thedevelopment of an instrument called the Foot-Candle Meter, which makes the measurementof illumination a quick and easy matter. Aglance at the scale of the instrument…
Electric lighting · Interior lighting fixtures, lamps, and ballasts
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