Operator
This 1874 New York trade periodical for telegraph operators, from the Smithsonian Libraries, carries advertisements for telegraph equipment aimed at working operators and those learning the trade. Its pictures are plain wood-engraved views of cylindrical galvanic battery cells with brass terminals and a telegraph sounder with a black coil, drawn with dense vertical hatching that a designer could use as a reference for dense textured line shading on metal and glass objects.
