Edmund Vernon Slide Rule and Tie Clasp

This small, one-sided sterling silver slide rule is in the form of a tie clip. It has A and D scales on the base and a C scale on the slide. A clear plastic indicator has a red line and is in a metal frame. The back of the clasp is marked: VERNON. It is also marked: STERLING.
The donor recalled that he obtained this tie clasp from Edmund Scientific Company. The 1965 catalog of the company lists a tie clasp with a "silver oxide" finish that cost $2.00. The 1971 catalog lists a tie clasp with a gold finish that cost $3.00. However, these tie clips had screws in each corner, while this example has no screws.
References: Edmund Scientific Company, Catalog 661 (Barrington, N.J., 1965), 44; Edmund Scientific Company, Catalog 721 (Barrington, N.J., 1971), 59; Dieter von Jezierski, "Slide Rule Tie Bars," Journal of the Oughtred Society 16, no. 1 (2007): 33–35.
Currently not on view
Object Name
calculating rule / tie clasp
slide rule / tie clasp
date made
ca 1965
date received
Edmund Scientific Company
Physical Description
sterling silver (overall material)
plastic (cursor material)
overall: 1.4 cm x 5.2 cm x 1.2 cm; 9/16 in x 2 1/16 in x 15/32 in
place distributed
United States: New Jersey, Barrington
ID Number
catalog number
accession number
Science & Mathematics
Slide Rules
Rule, Calculating
See more items in
Medicine and Science: Mathematics
Slide Rules
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of George A. Norton

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