Commonwealth 581 Admiration Professional Simplex Slide Rule

Description
The Commonwealth Plastics Corporation of Leominster, Mass., a manufacturer of plastic toys, dolls, and other goods, made this one-sided, six-inch inexpensive white molded plastic slide rule with a clear plastic frameless indicator. The base has A and D scales, with B, CI, and C scales on the slide. The slide also has linear scales along its edges, inches divided to sixteenths of an inch and centimeters divided to millimeters. The back of the rule has a table of equivalents and abbreviations. The back is marked in script: Admiration. It is also marked: U.S.A. The rule fits into two slots in a yellow card. The front of the paper holder is marked: Instructions for use (/) on back of card; Admiration (/) PROFESSIONAL SLIDE RULE; EASY TO USE (/) No. 581. The back of the card gives directions and examples for reading the scales, locating the decimal point, multiplication, division, squares, square roots, and cubes. The card and rule are in a plastic bag stamped: 30¢.
Commonwealth Plastics was founded around 1923 and remained in business at 98 Adams Street until at least 1960. It was not a major manufacturer of slide rules.
References: "William Morris Lester (1908–2005)," The Plastics Collection, Syracuse University Library Special Collections Research Center, http://scrc.syr.edu:8080/content/lester_wm.php; Karen Nugent, "A City in the Making, from Pianos to Plastics: Industrial Past Spotlighted for Tour," Telegram & Gazette, Worcester, Mass., May 27, 2010; ad for Extrusion Supervisor, The Telegraph, Nashua, N.H., February 12, 1960, 10.
Location
Currently not on view
Object Name
slide rule
date made
1950s
maker
Commonwealth Plastics Corporation
Physical Description
plastic (overall material)
paper (case material)
Measurements
overall: .3 cm x 17.8 cm x 7.4 cm; 1/8 in x 7 in x 2 29/32 in
place made
United States: Massachusetts, Leominster
ID Number
1988.0807.03
accession number
1988.0807
catalog number
1988.0807.03
subject
Rule, Calculating
Plastics
Science & Mathematics
Mathematics
Slide Rules
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
Additional Media

Visitor Comments

Add a comment about this object

**Please read before submitting the form**

Have a comment or question about this object to share with the community? Please use the form below. Selected comments will appear on this page and may receive a museum response (but we can't promise). Please note that we generally cannot answer questions about the history, rarity, or value of your personal artifacts.

Have a question about anything else, or would you prefer a personal response? Please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.

Image CAPTCHA
Enter the characters shown in the image.