Squares & TrianglesTriangles
The triangles in the mathematics collections illustrate the products sold by leading American makers of drawing instruments, including Darling, Brown & Sharpe of Providence, R.I.; and Keuffel & Esser of New York City. An American inventor, LeRoy J. Leishman, devised the Arcascope triangle and combination instrument. The objects on this page also show a transition from triangles made from steel, wood, and rubber to triangles made from plastic. The change in materials in the early 20th century has created a problem for preserving these instruments, as celluloid-based plastics are chemically unstable. Several of these objects are deteriorating despite efforts to store them in a controlled environment.
"Squares & Triangles - Triangles" showing 1 items.
- This 17-1/4" 45°-45°-90° maple triangle is formed from three pieces of wood and has an open interior. The hypotenuse is marked: J. L. HAMMETT CO. (/) CAMBRIDGE. MASS. John Hammett began selling erasers and slating paint for chalkboards in Rhode Island in 1863, moving to Boston in 1865. In 1890 new owners expanded the firm into all forms of paper school supplies. J. L. Hammett operated over 50 retail stores from 1974 to 2005. The Department of Mathematics at Brown University gave this object to the Museum in 1973.
- References: Bill Lane, "School Supplier J. L. Hammett to Close Stores," Boston Business Journal, January 4, 2005, http://www.bizjournals.com/boston/stories/2005/01/03/daily12.html; "J. L. Hammett Company," The Play and Playground Encyclopedia, http://www.pgpedia.com/j/jl-hammett-company.
- Currently not on view
- date made
- 20th century
- J. L. Hammett Co.
- ID Number
- catalog number
- accession number
- Data Source
- National Museum of American History, Kenneth E. Behring Center