US Patent: 542,511
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| Planimeter
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Patentee:
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| Edward J. Willis (exact or similar names) - Richmond, VA |
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Patent Dates:
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| Applied: |
Jan. 24, 1895 |
| Granted: |
Jul. 09, 1895 |
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Patent Pictures:
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1 | 2
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Joel Havens
Planimeter
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Description: |
| It is the purpose of my invention to provide a planimeter of simple and improved form, which may be used for measuring areas and to read the mean effective pressure and horsepower of a steam-engine, as shown by a steam indicator diagram, the measurements being read directly from the scale attached without calculation of any kind.
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