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Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 395
Uni-formlyIvightedArea. 2.9 feet. 3 5 4 Distancebetween LampsWhen Two or Moreare Used. HeiKhtofLamp andDiameterof Uni-formlyLightedArea. DistanceBetwetn liampsWhen Two or Moreare Used. De.sk or ReadingTable. 3 21^ 4.9 feet. 6 7 4 feet. 5 5.75 7 feet.8.5 9.8 2.501.661.25 General Lighting. 1 5 5.75 7… … Fig. 38. showing equal illumination are called, for each room before install-Architecture · Building · Carpentry
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