Hart Combination Protractor, Rule, and Square


This paper semicircular protractor is divided by degrees and marked by tens from 10 to 170 degrees in both directions. The letter A is printed in the bottom left corner of the protractor, and B is printed in the bottom right corner of the protractor. Centered under the origin point of the protractor is printed the inventor's mark: Combination Protractor, Rule, and Square (/) W. W. Hart, University of Wisconsin.

A ruler along the top edge is divided to 1/8-inch and marked by ones from 0 to 5. A ruler along the bottom edge is divided to millimeterS and marked by ones from 0 to 12. The typeface of the inventor's mark is similar to that shown in Hart's textbooks published in the 1920s, such as Walter Wilson Hart, Junior High School Mathematics, vol. 1 (Boston: D. C. Heath & Co., 1921), vii, 131. See also MA.304722.06.

Date Made: ca 1925

Designer: Hart, Walter Wilson

Location: Currently not on view

Place Made: United States: Wisconsin, Madison

Subject: MathematicsProtractorEducation, High School


See more items in: Medicine and Science: Mathematics, Science & Mathematics, Protractors


Exhibition Location:

Credit Line: Gift of Brown University Department of Mathematics

Data Source: National Museum of American History

Id Number: MA.304722.07Accession Number: 304722Catalog Number: 304722.07

Object Name: protractor

Physical Description: paper (overall material)Measurements: overall: .1 cm x 13.5 cm x 8.2 cm; 1/32 in x 5 5/16 in x 3 7/32 in

Guid: http://n2t.net/ark:/65665/ng49ca746b3-76e6-704b-e053-15f76fa0b4fa

Record Id: nmah_904306

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