Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 355
ons are kept separatedthe proper distance by the operating mechanisms which must per-form the following functions: 1. The carbons must be in contact, or be brought into contact, tostart the arc when the current first flows. 2. They must be separated at the right distance to form a proper… … Fig. 10. 297 J6 ELECTRIC LIGHTING The feeding of the carbons may be done by hand, as is thecase in some stereoptieons using an arc, but for ordinary illumina-tion the strikincr and maintaining of the arc must be automatic.It is made so in all cases by means of solenoids acting against theforce of…
Architecture · Building · Carpentry
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