Patent Model of a Machine for Coating Electrotype Molds with Plumbago

Tucker, Stephen D. · ca 1868

This patent model demonstrates an invention for a machine for coating electrotype; the invention was granted patent number 85411. The patent details a machine for brushing black lead (plumbago, graphite) or bronze powder onto either wax or gutta percha molds, in order to give them conducting surfaces. Stephen Tucker was an employee and, from I860, a partner with R. Hoe & Co. He was responsible for numerous patents for the company, and was the author of the company history, "A History of R. Hoe & Company, 1834- 1885.”