Electrical and scientific instruments and apparatus : november 20th, 1899
Trade catalogue of electrical and scientific instruments issued by Elmer G. Willyoung & Co. of New York and Philadelphia in November 1899, aimed at laboratories, engineers, and physics teachers buying measuring apparatus. The plates are wood-engraved three-quarter views of ammeters, resistance boxes, coils, and switchboards, with hatched shading on polished wood bases, brass terminals, and engraved dials, plus numbered callouts and maker's nameplates usable as instrument silhouettes or technical label lettering.
