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US Patent: 2,907
Improvement in Sliding Rules
Merchant's Slide Rule
Patentee:
John P. Smith - New York, NY

USPTO Classifications:
235/70R

Tool Categories:
rules : slide rules : scales

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Frances H. Dawes
W. Serrell

Patent Dates:
Granted: Jan. 10, 1843

Patent Pictures:
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Description:
This patent covers a special scale on a slide rule, containing 365 divisions to represent the days in a year. This allows the user to easily calculate time spans for interest payments and the like.

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