Glass insulators were first produced in the for telegraph lines, then for telephone and power transmission lines insulated from the wooden poles that held them up. They had to insulate the wire from the wood and for this, they
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Photograph of Transmission Lines in Mojave Desert Leading from Boulder Dam; From the series Ansel Adams Photographs of National Parks and Monuments, compiled 1941 - documenting the period ca. 1933 - Date 1941