Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 406
t 25 feet above the ground; 30 to 40 feet is better, especiallyif the space to be illuminated is quite open. With enclosed arcsit is often advantageous to ])lace them as low as IS to 20 feet fromthe ground. Table 9 gives the distance between lights for dif-ferent types of arcs for good… … In considering the type of arc light to be used we must turnto the illumination curves as shown in Fig. 43. These curves show that the illumination from adirect-current open arc in its presentform is superior to that from a direct-current enclosed arc, taking the sameamount of power, in the…
Architecture · Building · Carpentry
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