Ruler Advertising Marlin-Rockwell Company

The top edge of this steel ruler has a 15.2 cm scale, divided to millimeters. The bottom edge has a 6" scale, divided to 1/32". The ruler is marked: STAINLESS. It is also marked: MADE IN U.S.A. The back of the ruler is marked: MRC BALL AND ROLLER BEARINGS (/) MARLIN-ROCKWELL COMPANY DIVISION OF THOMPSON RAMO WOOLDRIDGE INC.
The Marlin Rockwell Corporation formed after World War I through the mergers of several American makers of ball bearings, including Standard Roller Bearing Company, Gurney Ball Bearing Company, and Strom Bearing Company. The firm merged with TRW, Inc., in 1964. According to the donor, the instrument was used by her husband, the electrical engineer Robert H. Wieler (1923–1993).
References: MRC Bearing Services, "MRC History," in Engineering Handbook (Kulpsville, Penn., 2005), 6,; accession file.
Currently not on view
Object Name
scale rule
date made
mid-20th century
Marlin Rockwell Corporation
Physical Description
steel (overall material)
overall: .1 cm x 16 cm x 1.1 cm; 1/32 in x 6 5/16 in x 7/16 in
place made
United States
ID Number
catalog number
accession number
Scale Rules
Science & Mathematics
Rule, Measuring
Promotional Item
See more items in
Medicine and Science: Mathematics
Scale Rules
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Norma P. Wieler
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.

Enter the characters shown in the image.