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 46
e quickly and clearly andcomfortably for long periods of time. He canprove to his own satisfaction that a fewweeks accumulation of dust and dirt upon thelighting equipment may cut the light deliveredat the work to one-half or even one-third of theamount delivered when the equipment is clean;and he… … A Survey of Lighting Conditions is Easily and Quickly Made
Electric lighting · Interior lighting fixtures, lamps, and ballasts
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