US Patent: 542,511 - Planimeter


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US Patent: 542,511

Planimeter

Patentee:

Edward J. Willis (exact or similar names) - Richmond, VA

USPTO Classifications:

33/122

Tool Categories:

Assignees:

None

Manufacturer:

James L. Robertson & Sons - New York, NY

Witnesses:

Patent Dates:
Applied:	Jan. 24, 1895
Granted:	Jul. 09, 1895

Patent Pictures: [ 1 | 2 ]

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Planimeter

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.