Circular Protractor
notes: label: Description
content: This circular brass protractor is graduated by degrees and bears eight sets of markings by fives from 5 to 45. Each 45-degree section is labeled underneath the numbers: M; an inverted V over a cross; G; an X superimposed on a cross; S; O; A; P. These letters and symbols do not correspond to any standard sets of astronomical, astrological, or mathematical symbols. Two crosspieces on the interior of the protractor are marked with the Latin alphabet: ABCDEFGHIKLM; NOPQRSTVXYZG. It is not known what the final G signifies. A scale above the alphabet is divided into four increments per letter. A brass limb is affixed to the center of the protractor. The limb is divided and marked by tens from 10 to 90. Each division is approximately 3/8" wide.
label: Description
content: The instrument is decorated with scrolling, fleurs-de-lis, and a flower at the center of the limb that resembles a pansy. The craftsmanship is crude on the whole, with the angle divisions in particular appearing to be drawn free-hand rather than stamped. The instrument also may have been cut by hand from a sheet of brass. If this protractor is authentic, it likely dates to around 1700.
label: Description
content: The Smithsonian purchased this instrument in 1959 from a dealer in antiques, Maurice van Geuns (1905–2000) of New York City. Van Geuns grew up in Groningen in the Netherlands. He spent two years in France in the early 1940s and then enlisted in the U.S. Army in 1943 and served five years.
label: Description
content: Reference: "Je woont in New York en kunt je geboortestad niet vergeten (16 Dec.)," <I>Voices from Holland: A Bilingual Quarterly Update of News from the Netherlands</I> (Winter 1997-1998): 6, http://www.voicesfromholland.nl/pdf/1VoicesWinter97.pdf .
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
label: Subject
content: Protractor
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Science & Mathematics
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content: Protractors
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.316861
label: accession number
content: 227535
label: catalog number
content: 316861
objectType: label: Object Name
content: protractor
physicalDescription: label: Physical Description
content: brass (overall material)
label: Measurements
content: overall: .3 cm x 16 cm x 24.5 cm; 1/8 in x 6 5/16 in x 9 21/32 in