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Scientific American, Vol. 40, No. 4 (1879) (1879)
leaf 7
excavators are placed on two hulls, carrying latter. When the current is cut off, the armature falls away upper edge of the lower plate. The arc then either estab- lishes itself at the points of least resistance between the two carbons, or it may be established at any place desired, say at one… … © 1879 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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