Object Details
designer
Hart, Walter Wilson
Description
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.
Location
Currently not on view
Credit Line
Gift of Brown University Department of Mathematics
date made
ca 1925
ID Number
MA.304722.07
accession number
304722
catalog 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
place made
United States: Wisconsin, Madison
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Protractors
Data Source
National Museum of American History
Subject
Mathematics
Protractor
Education, High School
Link to Original Record
Record ID
nmah_904306