C-Thru Hinged Parallel Rule
date: label: date made
content: mid 20th century
name: label: maker
content: C-Thru Ruler Company
notes: label: Description
content: 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.
label: Description
content: 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.
label: Description
content: References: Brian Dowling, "Acme United Acquires Bloomfield's C-Thru Ruler," <i>Hartford Courant</i>, June 11, 2012; "About Us," <i>C-Thru Ruler Company</i>, http://www.cthruruler.com/.
label: Location
content: Currently not on view
place: label: place made
content: United States: Connecticut, Bloomfield
topic: label: Subject
content: Mathematics
label: Subject
content: Drafting, Engineering
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Science & Mathematics
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content: Parallel Rules
creditLine: label: Credit Line
content: Gift of Karen M. Lee
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1990.3130.01
label: catalog number
content: 1990.3130.01
label: nonaccession number
content: 1990.3130
objectType: label: Object Name
content: parallel rule
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: 1.5 cm x 45.7 cm x 6.5 cm; 19/32 in x 18 in x 2 9/16 in