Perrygraf Enamel Coating Calculator Slide Rule for Armco

Description
This blue, tan, and white cardboard rule consists of an envelope held together by six metal rivets and a paper slide. The rule calculates the weight of an enamel coating, given the area of a metal sample; the surface area of metal, given its thickness and weight; and the weight of enamel per square foot of surface coated, given the weight of enamel used, the thickness of the metal sample, and the weight of the metal.
Perrygraf Corporation of Maywood, Ill., made this instrument (copyrighted in 1941) for the American Rolling Mill Company of Middletown, Ohio. ARMCO produced and enameled coils of sheet steel at plants in Middletown and Ashland, Ky. Since 1999, the company has been part of AK Steel. For more on Perrygraf, see 1979.3074.03.
Reference: "American Rolling Mill Company," Ohio History Central: An Online Encyclopedia of Ohio History, July 1, 2005, http://www.ohiohistorycentral.org/entry.php?rec=840.
Location
Currently not on view
Object Name
calculating rule
slide rule
date made
1941
maker
Perry Graf Corporation
Physical Description
metal (part material)
paper (overall material)
Measurements
overall: .2 cm x 22 cm x 7.6 cm; 3/32 in x 8 21/32 in x 3 in
ID Number
1983.3009.05
catalog number
1983.3009.05
nonaccession number
1983.3009
subject
Mathematics
Rule, Calculating
metalworking
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Slide Rules
Data Source
National Museum of American History, Kenneth E. Behring Center

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