Some polar planimeters sold in the United States, particularly the products offered by Keuffel & Esser of New York, cannot be traced to their original manufacturers. Most of these instruments were probably made in Germany or Switzerland. This page also shows the one electronic planimeter in the collections, a polar model made by Lasico of Los Angeles.
"Planimeters - Polar–Other" showing 1 items.
- The citation information for this 32-page booklet is: K+E Manual: Compensating Polar Planimeters, 4236, 4236M & 4242 ([New York]: Keuffel & Esser Co., 1949). It was received with 1991.0882.01.
- The booklet explains the operation, care, and use of compensating polar planimeters, with several pages on tracing areas and making calculations. Five tables of factors and settings for scale drawings or maps are provided. The booklet also discusses factors influencing the accuracy of the instrument and highlights adjustments and measurements unique to K&E model 4242, which had adjustable arms. See 1999.0250.01 and 1998.0032.03. Finally, the general mathematical theory of the polar planimeter is outlined.
- Currently not on view
- date made
- Keuffel & Esser Co.
- ID Number
- accession number
- catalog number
- Data Source
- National Museum of American History, Kenneth E. Behring Center