Patent Model of a Machine for Coating Electrotype Molds with Plumbago

Patent Model of a Machine for Coating Electrotype Molds with Plumbago

Description (Brief)
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.”
Currently not on view
Object Name
machine, electrotype coating
Object Type
Patent Model
date made
ca 1868
patent date
Tucker, Stephen D.
Physical Description
metal (overall material)
wood (overall material)
overall: 24.8 cm x 16.8 cm x 27.8 cm; 9 3/4 in x 6 5/8 in x 10 15/16 in
ID Number
patent number
accession number
catalog number
See more items in
Work and Industry: Graphic Arts
Industry & Manufacturing
Patent Models
Patent Models, Graphic Arts
Data Source
National Museum of American History
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.


Add a comment about this object