Safe-T Open Triangles, Group of 2

These two translucent orange plastic triangles have rounded corners, triangle cutouts in their interiors, and slots for drawing lines parallel to each edge. They are both marked: SAFE-T TRIANGLETM (/) PO BOX 692 LaGrange, IL 60525 (/) Shatter Resistant SAFE-T PLASTICTM VIEW-THRUTM. The 4-7/8" 30°-60°-90° triangle is also marked: 42053. On the long leg, it has a scale of inches, divided to 1/16" for two inches and to 1/10" for two inches and numbered by ones from 1 to 4. The short leg has a centimeter scale divided to millimeters and numbered by ones from 0 to 6.
The 3-1/2" 45°-45°-90° triangle is also marked: 42054. One leg has a scale of inches, divided to 1/16" and numbered by ones from 1 to 3. The other leg has a centimeter scale divided to millimeters and numbered by ones from 0 to 8. The triangles were made in 1997 or earlier. In a company catalog (1998.0033.04), these models were renumbered to 42063 and 42064, respectively, and priced at 55¢ each. The pair could be purchased as a set for $1.35. The slots on the examples in the catalog were relocated to the corners of the triangles, so that they were easier to use for drawing templates of angles and triangles. Also, the model numbers were removed from the triangles. The form depicted in the 1998 catalog was still marketed in 2013.
Safe-T Products, Inc., of La Grange, Ill., was established in 1992 and specialized in drawing instruments that were safe for children. In 2006, the company became a subsidiary of A. Daigger & Company and its name changed to Classroom Products Warehouse.
References: SAFE-T Products, Inc., Innovative Safe Drawing and Measuring Instruments, about 1998; "About Us," Classroom Products Warehouse,
Currently not on view
Object Name
triangles, group of
triangles, group of two
date made
before 1998
Safe-T Products, Inc.
Physical Description
plastic (overall material)
overall: 9 cm x 9 cm x .1 cm; 3 17/32 in x 3 17/32 in x 1/32 in
place made
United States: Illinois, La Grange
ID Number
catalog number
accession number
Squares and Triangles
Science & Mathematics
Drawing Instruments
See more items in
Medicine and Science: Mathematics
Squares and Triangles
Data Source
National Museum of American History, Kenneth E. Behring Center
Additional Media

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