Graphic Calculator Co. Stephenson-Pfahl Hardenability Slide Rule

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Country of manufacture: USA,            Date of manufacture: ____,         Serial No.: ____
Materials & Components: Plastic and cardboard folder containing plastic frame (shown on the left below) holding 14 slides or fixed scales representing metallurgical properties or amounts of various alloying elements; also contains a separate smaller slide rule (shown on the right below) called an "End-Quench Hardenability Curve Calculator".
Overall Folder Dimensions - Length: 30.4 cm,          Width: 13.8 cm,,          Thickness: 1.5 cm,           Weight: 449.5 gms
Curve Calculator Dimensions - Length: 23.6 cm,          Width: 7.7 cm,,          Thickness: 0.2 cm,           Weight: 44.5 gms
Slides in frame: Mn, P, S, Si, Ni, Cr, Mo, V, Grain Size, User Defined (blank), For Multiplying (or additional User Defined)
Scale on frame: C, Ideal Critical Diameter, Jominy Distance
Condition: C5 (Normal signs of use)
Came with: Original black folder case w/snap closures, instructions, plastic End Quench Hardenability Curve Calculator, graph illustrating relations between Jominy test distance and diameter of test round.

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