Carrington's Patent Rolling Parallel Rule

Description
A 14" trapezoidal mahogany frame with metal end pieces covers two mahogany rollers that rotate on metal shafts. A paper label is marked: CARRINGTON'S PATENT PARALLEL RULER, FOR COUNTING HOUSES, &C. The label is decorated with an eagle over a shield with arrows in its claws. The eagle's beak holds a banner marked: E PLURIBUS UNUM.
On April 14, 1832, James Carrington of Wallingford, Conn., patented a parallel ruler that was later manufactured by William Hill of Wallingford. The rollers were raised in order to prevent ink from smearing as the ruler was moved across a drawing. In 1849 the U.S. House of Representatives ordered six dozen of the rulers from R. Farnham, a stationer in Washington, D.C., for $2.30 per dozen. This suggests the rules were used relatively widely for a significant period of time. Before he built a dam and factory in Wallingford around 1830, Carrington was a supervisor and inspector at the Harpers Ferry and Springfield armories.
References: "American Patents," The Repertory of Patent Inventions 15 (1833): 24; "Power, Factories, Invention," in Centennial of Meriden: June 10–16, 1906 (Meriden, Conn.: Journal Publishing Co., 1906), 245; U.S. House of Representatives, Contracts for Stationery, 31st Congress, 1st Session, Miscellaneous, No. 16, December 31, 1849 (Washington, D.C., 1850), 16–17; Hiram Williams Beckwith, History of Montgomery County, Together With Historic Notes on the Wabash Valley (Chicago, 1881), 246; Merritt Roe Smith, Harpers Ferry Armory and the New Technology (Cornell: University Press, 1977), 203, 207, 229.
Location
Currently not on view
Object Name
parallel rule
date made
mid 19th century
patentee
Carrington, James
Physical Description
metal (overall material)
wood (overall material)
Measurements
overall: 2.2 cm x 35.6 cm x 4.9 cm; 7/8 in x 14 1/32 in x 1 15/16 in
place made
United States: Connecticut, Wallingford
ID Number
MA*293320.2818
accession number
293320
catalog number
293320.2818
subject
Parallel Rules
Science & Mathematics
Mathematics
Drafting, Engineering
Business
See more items in
Medicine and Science: Mathematics
Parallel Rules
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Warshaw Collection of Business Americana
Additional Media

Visitor Comments

Add a comment about this object

Submit a comment or ask a question about this object using the form below. Submissions are moderated and may receive a curator response. Please note that we cannot evaluate or appraise your personal artifacts. For other questions or general inquiries 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.