Acu-Rule Spring Design Slide Rule for Connecticut Spring Corporation

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Country of manufacture: USA,            Date of manufacture: c1946
Overall length: 31.5 cm,          Width: 3.9 cm,           Weight: 120.2 gms.
Materials: Magnesium core, vinyl laminate
Cursor: 3.0 X 5.5 X 1.0 cms; plastic; lines = single hairline, front & back
Scales: 12
Front: Wire Size [Wire Size, Ratio D/d (for Wahl Factor Correction), Rect. Ratio b/t, Load] Deflection
Back: Mean Diameter [Mean Diameter, Active Coils, G (modulus correction), Rect. Ratio b/t] Stress
Condition: C3-C4 (Very minimal to minimal signs of use)
Came with: nothing

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