Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 399
< aco •<u PQ OO <2 O K C o H•< DSU & Sa cbe fa :i . .a K -■ S a ■a 10 o a a,o soo KO z … •J <u X o< o Q <Z o o s ^ a o 8 O -5 fa 3 •aoo & b:o b uto O X so o 03C3 ■2 sa h ■a ^o ELECTRIC LIGHTING 49 lamps are to be preferred to the arc or vapor lamps, though thelatter are often the more efhcient. When arcs are used, they mustbe carefully shaded so as to diffuse the light,…
Architecture · Building · Carpentry
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