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.

Date Made: 1941

Maker: Perry Graf Corporation

Location: Currently not on view

Subject: MathematicsRule, Calculatingmetalworking

Subject:

See more items in: Medicine and Science: Mathematics, Science & Mathematics, Slide Rules

Exhibition:

Exhibition Location:

Credit Line: Transfer from Smithsonian Institution Libraries

Data Source: National Museum of American History

Id Number: 1983.3009.05Catalog Number: 1983.3009.05Nonaccession Number: 1983.3009

Object Name: calculating ruleslide rule

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

Guid: http://n2t.net/ark:/65665/ng49ca746a5-0f7a-704b-e053-15f76fa0b4fa

Record Id: nmah_694151

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