Perrygraf Enamel Coating Calculator Slide Rule for Armco
date: label: date made
content: 1941
name: label: maker
content: Perry Graf Corporation
notes: label: Description
content: 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.
label: Description
content: 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.
label: Description
content: Reference: "American Rolling Mill Company," <i>Ohio History Central: An Online Encyclopedia of Ohio History</i>, July 1, 2005, http://www.ohiohistorycentral.org/entry.php?rec=840.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
label: Subject
content: Rule, Calculating
label: Subject
content: metalworking
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Science & Mathematics
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content: Slide Rules
creditLine: label: Credit Line
content: Transfer from Smithsonian Institution Libraries
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1983.3009.05
label: catalog number
content: 1983.3009.05
label: nonaccession number
content: 1983.3009
objectType: label: Object Name
content: calculating rule
label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: metal (part material)
label: Physical Description
content: paper (overall material)
label: Measurements
content: overall: .2 cm x 22 cm x 7.6 cm; 3/32 in x 8 21/32 in x 3 in