Polar Planimeter
date: label: date made
content: ca 1930
notes: label: Description
content: This German silver and steel instrument has a white celluloid measuring wheel and vernier. It is in the general style of an Amsler fixed-scale planimeter, but it has no registering dial. The 4" tracer arm and 6" pole arm are connected by a hinge and form a circle around the measuring wheel when the instrument is closed. The cylindrical weight is screwed to a short revolving arm that is screwed on top of the pole arm. The lengths of the arms are not adjustable.
label: Description
content: A wooden case covered with black leather is lined with black velvet. White trim is around the inside edges of the case. A small piece of paper glued inside the bottom of the case is marked: 0.01 [square] in.
label: Description
content: There is no mark for a maker or distributor, but this instrument closely resembles a planimeter sold by the Eugene Dietzgen Company in 1926 as model 1800 for $17.75. Compare to MA.318485.
label: Description
content: The instrument was received at the Smithsonian in 1989.
label: Description
content: Reference: <i>Catalog of Eugene Dietzgen Co.</i>, 12th ed. (Chicago, 1926), 180.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
label: Subject
content: Engineering
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 LaVerne Watkins
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1989.0305.01
label: accession number
content: 1989.0305
label: catalog number
content: 1989.0305.01
objectType: label: Object Name
content: planimeter
physicalDescription: label: Physical Description
content: german silver (overall material)
label: Physical Description
content: steel (overall material)
label: Physical Description
content: plastic (overall material)
label: Physical Description
content: wood (overall material)
label: Physical Description
content: leather (overall material)
label: Physical Description
content: fabric (overall material)
label: Physical Description
content: paper (overall material)
label: Measurements
content: case: 5 cm x 18.2 cm x 5 cm; 1 31/32 in x 7 5/32 in x 1 31/32 in