Heanysintered tungsten lamp, c1908. This tungsten lamp was at the heart of a Patent Office scandal that saw two men jailed and Heany’s patents disallowed. See Arthur Bright "The Electric Lamp Industry," for the Heany patent fraud case. There are also contemporary articles in Electrical World.
Brass medium-screw base with skirt, one glass insulator and one ceramic insulator. Seven single-arch non-ductile (sintered) tungsten filaments in series, 7 upper & 6 lower supports (note eyes on upper supports - insulators?), carbon-paste connectors, Siemens seal, asbestos(?) insulator. Tipped S-shaped envelope with taper at neck, 1/2 frost. Mazda A type. “Pat Oct. 15, 1907” stamped on base, “329458”(?) printed on base. “9” inked on one side of press, “H” molded on other side. Label reads: “Heany V Tungsten Pat Dec. 25. 06 Pat Dec. 03. 07 Other Patents Pending”. “Heany” on label in stem. Partial “H” on envelope appears to be remnant of a William Hammer Collection marking.
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