US Patent: 2,907
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Improvement in Sliding Rules
Merchant's Slide Rule
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Patentee:
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| John P. Smith (exact or similar names) - New York, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Jan. 10, 1843 |
USPTO (New site tip)
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Ralph Brendler
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Description: |
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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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