Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 404
if the light ordinarily thrown above thehorizontal plane is to be utilized. In calculating the illumination due to any type of lamp at agiven point it is necessary to know the distribution curve of thelamp used and the distance to the point illuminated. The approxi-mate illumination is given by… … Pig. 41. ,0 50° 40 // = distance the lamp is mounted above the ground, in feet,and d -- distance from the base of the pole supporting the lampto the point where the illu-mination is being considered.See Fig. 40. While this will give theillumination in candle-feet,the nature of the lightingcannot be…
Architecture · Building · Carpentry
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