Diagram of electrotyping apparatus of the U.S

Diagram of electrotyping apparatus of the U.S. Coast Survey. This apparatus allowed for the unlimited duplication of copper plate copies of original engraved copper plate engravings. This in turn was a major step in the ability of the Coast Survey to mass produce nautical charts as each plate was good for only between 500 to1000 impressions on a printing press.

Photo Category: Coast and Geodetic Survey - Printing - Electrotype
Photo Location: Washington, D.C. Coast Survey office
Photo Date: 1851