Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Disk on plate
United States Steel Hardenability Slide rule
Graphic Calculator CompanyUSA
c. 197020.3 cm x 20.3 cmSteel Industry

Notes: "1) Used to determine hardenability for vatious steel compositions 2) Three concentric disks on the front side and two on the reverse, each with clear cursors"

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