Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 364
Fig. 15. P>y an Open Arc is meant an arc lamp in which the arc isexposed to the atmosphere, while in \h% Enclosed Arc an inner orenclosing globe surrounds the arc, and. this globe is covered witha cap which renders it nearly air-tight. Fig. 15 is a good exampleof an enclosed arc as manufactured…
Architecture · Building · Carpentry
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