Keuffel & Esser 4236 Polar Compensating Planimeter
date: label: date made
content: 1949-1955
name: label: retailer
content: Keuffel & Esser Co.
notes: label: Description
content: This German-made fixed-arm polar planimeter has a 4-1/2" metal and bronzed brass tracer arm and an 8" bronzed brass pole arm welded to a cylindrical weight. A carriage on the tracer arm has a white plastic measuring wheel, vernier, and registering dial. The carriage is marked with a serial number: 1862. The pole arm is marked: K+E KEUFFEL & ESSER CO. It is also marked: MADE IN (/) GERMANY. A rectangular metal test plate with slanted corners is marked: 10 (/) sq. in. A glass magnifier is wrapped in a white facial tissue. The tissue is marked in ink: 1 (/) 1424 (/) <u>1798</u> (/) 6.26.
label: Description
content: A wooden case covered with discolored black leather is lined with tan chamois leather, which has rust stains. A label pasted inside the lid of the case says that this is Keuffel & Esser model 4236, serial number 1862, with area of the neutral circle of 214.45 square inches. The case fits in a green cardboard box with masking tape along the edges. The top of the box is marked: A. P. M. One end of the bottom of the box has a red and green label marked: K+E (/) 4236 (/) COMPENSATING (/) POLAR PLANIMETER. The instrument was received with instructions, 1991.0882.02.
label: Description
content: K&E introduced model 4236 in 1939 and began to use its K+E logo in 1949. Between 1955 and 1962, the open carriage was replaced with a closed top. The donor, biologist Anne P. Merrill (1916–2002), used this planimeter when she was researching the contraceptive effects of progesterone with Gregory Pincus and Min Chueh Chang at the Worcester (Mass.) Foundation for Experimental Biology. They received their initial grant money from Katharine McCormick in 1951, and it is likely Merrill purchased the planimeter around that time. In 1949 the instrument sold for $35.00, and in 1956 it cost $32.50.
label: Description
content: The instrument reached the Smithsonian in 1991.
label: Description
content: References: Clark McCoy, "Collection of Pages from K&E Catalogs for the 4236 Family of Polar Planimeters," http://www.mccoys-kecatalogs.com/PlanimeterModels/ke4236family.htm; Kimberly A. Buettner, "John Charles Rock," <i>Embryo Project Encyclopedia</i> (2007), hdl.handle.net/2286/embryo:124783; Lara V. Marks, <i>Sexual Chemistry: A History of the Contraceptive Pill</i> (New Haven: Yale University Press, 2001), 92; <i>Catalogue of Keuffel & Esser</i>, 40th ed. (Hoboken, N.J., 1944), 226; <i>K+E Price List, Applying to the 41st Edition Catalog, Part I</i> (Hoboken, N.J.: Keuffel & Esser Co., 1949), 33; <i>K+E Price List, Applying to the 42nd Edition Catalog, Part I</i> (Hoboken, N.J.: Keuffel & Esser Co., 1956), 44; accession file.
label: Location
content: Currently not on view
place: label: place made
content: Germany
topic: label: Subject
content: Mathematics
label: Subject
content: Pharmacy
label: Subject
content: biochemistry
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Planimeters
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of Anne P. Merrill
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1991.0882.01
label: accession number
content: 1991.0882
label: catalog number
content: 1991.0882.01
objectType: label: Object Name
content: planimeter
physicalDescription: label: Physical Description
content: metal (overall material)
label: Physical Description
content: plastic (overall material)
label: Physical Description
content: leather (overall material)
label: Physical Description
content: wood (overall material)
label: Physical Description
content: glass (overall material)
label: Physical Description
content: cardboard (overall material)
label: Measurements
content: case: 6 cm x 23.8 cm x 9.5 cm; 2 3/8 in x 9 3/8 in x 3 3/4 in