Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 151
for the Nernst lamp isbased upon the mean hemispherical candle-power and it should notbe compared directly with the other efficiencies. The color of thelight in all of the above cases is suitable for the majority of classes ofillumination, the light from the higher efficiency units being some-what… … 60 7S so 7S> 60 Pig. 26. Distribution Curve of 132-Watt Type Westinghouse Nernst Lamp.Single Glower. always to be recommended as the service is unsatisfactory in somecases. The minimum size of units for 110 volts is about 4 candle-power for the carbon lamp, 20 candle-power for the metallic…
Architecture · Building
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