Safe-T Semicircular School Protractor
date: label: date made
content: 1998
name: label: maker
content: Safe-T Products, Inc.
notes: label: Description
content: This clear plastic semicircular protractor arrived at the Smithsonian in a clear plastic wrapper, which is stored with it. Designed for use by schoolchildren, it contains four sets of divisions, three to single degrees and the innermost one to ten degrees.
label: Description
content: The outer two divisions are marked by tens for reading left-opening angles, from 0° to 180°. The inner two divisions are marked by tens for reading right-opening angles, from 170° to 0°. A semicircular slot separates the two scales.
label: Description
content: The interior of the protractor is open. A scale along the bottom edge of the opening is divided to millimeters and marked by centimeter from 0 to 10. The outer bottom edge of the protractor is divided to sixteenths of an inch and is marked by inches from 1 to 6. The corners are slightly rounded.
label: Description
content: The object bears several marks along its diameter edge: PAT. [/] PENDING; SAFE-T TM [/] PRORUCTS [sic] Inc.; Angles Opening Left (>) [/] Use Upper Scale; VIEW-THRU TM [/] SAFE-T PLASTIC TM [/] #45780; Angles Opening Right (<) [/] Use Lower Scale; La Grange, IL [/] 60525-0692.
label: Description
content: Reference: SAFE-T Products, Inc., Innovative Safe Drawing and Measuring Instruments, about 1998. According to this catalog, these protractors sold individually for 75 cents. In 2006, the company became a subsidiary of A. Daigger & Company and its name changed to Classroom Products Warehouse.
label: Location
content: Currently not on view
place: label: place made
content: United States: Illinois, La Grange
topic: label: Subject
content: Mathematics
label: Subject
content: Education, High School
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Science & Mathematics
label: See more items in
content: Protractors
creditLine: label: Credit Line
content: Collected at the American Mathematical Society annual meeting, 8 January 1998
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1998.0033.02
label: catalog number
content: 1998.0033.02
label: accession number
content: 1998.0033
objectType: label: Object Name
content: protractor
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Measurements
content: overall: .1 cm x 15.8 cm x 8.5 cm; 1/32 in x 6 7/32 in x 3 11/32 in