Mathematician and electrical engineer (1865-1923) who made major advances in the development of alternating current. Vintage glossy 8 x 10 photo of Steinmetz with fragments of a tree branch damaged by a lightning generator, signed in the lower border in fountain pen. Affixed to a same-size mount and in very good to fine condition, with two small dents to the right edge, and creasing to the top coming down over Steinmetz's left shoulder.
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