Lenticular Ruler with Rivet Tables

This blue and black lenticular card has a ruler along the top edge. When viewed at one angle, a centimeter ruler is divided to millimeters and numbered by ones from 1 to 15. Below the ruler is a table for rivet code numbers, with row headings POP TAP, POP TLP, and IMEX. From another angle, a six-inch ruler is divided to 1/32" and numbered by ones from 1 to 6. Below the ruler is a table for riveting thickness, with row headings POP ALUM, POP MONEL, and IMEX.
British engineer Hamilton Neil Wylie invented blind or pop rivets between 1916 and 1927. They may be installed in situations where the body (such as an aircraft) or building being assembled may be accessed from only one side. Introduced in 1955, Imex rivets are sealed on one side. While both terms are now in common use, Pop and Imex were originally brand names used by the George Tucker Eyelet Company of Birmingham, England. The rivet metals in the table include aluminum and Monel, a nickel alloy trademarked by Special Metals Corporation of New Hartford, N.Y.
The donor found this object in a used book he bought at Humboldt State University in Arcata, Calif., in 1976. The back has several pen and pencil marks, including: 4.11.74; James Ramkinson; S; India Education Trust (/) Dod[illegible]nt Avenue; M. Rodrigues.
Reference: "The History of Stanley Engineered Fastening in Europe," http://www.emhart.eu/eu-en/about-emhart/history.php.
Currently not on view
Object Name
scale rule
date made
ca 1974
Physical Description
plastic (overall material)
cardboard (overall material)
overall: 16.3 cm x 5 cm x .1 cm; 6 13/32 in x 1 31/32 in x 1/32 in
ID Number
accession number
catalog number
Scale Rules
Science & Mathematics
Rule, Measuring
Industry & Manufacturing
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 David Shayt
Additional Media

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