Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 173
this wire is balanced against a spring and thearc is regulated by such contraction or expansion of the wire. Sucha lamp is suitable for either direct or alternating current. In themotor mechanism, as applied to alternating-current lamps, a metallicdisk is actuated by differential magnets and its… … Fig. 41. Clock Feeding Mechanism forLuminous Arc Lamp. 138
Architecture · Building
Internet Archive · Kelly Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-649-447.webp)
