Mathematical Table, Hardness Conversion Table for Nickel Alloy Steels
date: label: date made
content: 1939
name: label: maker
content: Joseph T. Ryerson & Son, Inc.
notes: label: Description
content: Companies seeking to provide customers with advertisements they might consult repeatedly sometimes distributed convenient mathematical tables. This is an example of one of these. The small white plastic card has figures printed in black. The table gives approximate conversions between the figures obtained from several different methods of measuring the hardness of nickel alloy steels. The numbers are associated with the Brinnell, Vickers or Forth, Rockwell, and Shore scales, as well as the tensile strength.
label: Description
content: One edge of the table contains a scale 10 centimeters long, divided to millimeters. The other contains a scale 4 inches long, divided to 1/20th of an inch.
label: Description
content: The reverse of the table describes the advantages of Ryerson certified steels. It is marked in part: 75C 2-39. It is also marked: PRINTED (/) IN (/) U.S.A.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
label: Subject
content: Manufacturing
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Mathematical Charts and Tables
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of I. Bernard Cohen
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1988.3076.03
label: catalog number
content: 1988.3076.03
label: nonaccession number
content: 1988.3076
objectType: label: Object Name
content: mathematical table
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Measurements
content: overall: .2 cm x 6.8 cm x 12.3 cm; 3/32 in x 2 11/16 in x 4 27/32 in