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 41
a drafting room from beingmade a reasonably good reflecting surface,semi-enclosing units offer a quality ofillumination which is next in choice tothat of semi-indirect or totally indirectsystems. For satisfactory results, thesemi-enclosing units must be closelyspaced and the entire installation…
Electric lighting · Interior lighting fixtures, lamps, and ballasts
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