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Rare Antique Almon B. Calkins of Bridgeport, Connecticut, Polar Planimeter For Sale
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Rare Antique Almon B. Calkins of Bridgeport, Connecticut, Polar Planimeter:
$350.00
Best known for his Steam Engine IndicatorsAlmon B. Calkins of Bridgeport, Connecticut invented his own Polar Planimeter, Patented September1, 1891, Pat. No. US458,968. This is a simplified version from the patent. Fabricated by The American Watch Company of Waltham, Massachusetts. Serial No. 127 The case and instruments are in excellent condition. Additional photos on request
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