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
Rule, Measuring
Promotional Item
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Scale Rules
Data Source
National Museum of American History, Kenneth E. Behring Center


Add a comment about this object