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US Patent: 67,721
Improved apparatus for moulding plates of lead
Patentee: Stillman E. Chubbuck (exact or similar names) - Boston, MA USPTO Classifications: 164/338.1, 249/137 Tool Categories: specialty machines : foundry machines : casting molds Assignees: Joseph H. Chadwick - Boston, MA Manufacturer: Not known to have been produced Witnesses: Phineas B. Smith, Jr. A. Parker Newman	Patent Dates: Granted: Aug. 13, 1867 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for S. E. Chubbuck & Sons
Description: The innovation is a mould with steam chambers so that it can be pre-heated to prevent the lead from cooling too quickly.

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