C-Thru Hinged Parallel Rule
C-Thru Hinged Parallel Rule
Usage conditions apply
- Description
- This clear plastic ruler has two aluminum hinges and small positioning knobs that may be tightened or loosened. The lower left and upper right corners of the blades are marked: 18". The hinges are marked: THE C-THRU RULER CO. (/) BLOOMFIELD, CONN. U.S.A. Six circular slices of cork on the bottom of the instrument protect the surface on which it is used.
- Teacher Jennie Zachs established the C-Thru Ruler Company of Hartford, Conn., in 1939. Although the firm was acquired by Acme United Corporation in 2012, it continues to make drafting tools and drawing instruments, including an aluminum version of this instrument. For other C-Thru products, see 1984.1071.12 and 1988.0807.02.
- References: Brian Dowling, "Acme United Acquires Bloomfield's C-Thru Ruler," Hartford Courant, June 11, 2012; "About Us," C-Thru Ruler Company, http://www.cthruruler.com/.
- Location
- Currently not on view
- Object Name
- parallel rule
- date made
- mid 20th century
- maker
- C-Thru Ruler Company
- place made
- United States: Connecticut, Bloomfield
- Physical Description
- plastic (overall material)
- metal (overall material)
- Measurements
- overall: 1.5 cm x 45.7 cm x 6.5 cm; 19/32 in x 18 in x 2 9/16 in
- ID Number
- 1990.3130.01
- catalog number
- 1990.3130.01
- nonaccession number
- 1990.3130
- Credit Line
- Gift of Karen M. Lee
- subject
- Mathematics
- Drafting, Engineering
- See more items in
- Medicine and Science: Mathematics
- Science & Mathematics
- Parallel Rules
- Data Source
- National Museum of American History
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