US Patent: 42,776 - Improvement in Sliding Scales for Steam Engines


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US Patent: 42,776

Improvement in Sliding Scales for Steam Engines

Patentee:

Arnold Jillson (exact or similar names) - Cumberland, RI

USPTO Classifications:

235/70R

Tool Categories:

rules

Assignees:

None

Manufacturer:

The Stanley Rule & Level Co. - New Britain, CT

Witnesses:

John D. Thurston

Benj. F. Thurston

Patent Dates:
Granted:	May 17, 1864

Patent Pictures:

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Description:

Invention to include the horsepower calculations for steam engines, replacing the table previously used for pumping engines.

Known example is only marked with the patent date on the brass endcap with no manufacturer. Stanley No 6 rules are reported to exist with patent mark and horse power tables.

Second earliest patent for this category.