K&E 4012 Thacher Cylindrical Calculator

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Country of manufacture: USA,            Date of manufacture: ____,           Serial No.: 3494
Overall length: 57.0 cm (including knobs), 46.0 cm (scale segments);           Diameter: 9.8 cm (Inner Cylinfer), 11.5 (Outer rotating frame)
Materials: Mahogany, brass, cloth, and paper
Scales: 3
Inner Cylinder: 40 A-scale segments
Outer Rotating Frame: 20 slats, each with 2 B-scale segments and 2 C scale segments.
Condition: C5 (Signs of normal use)
Came with: Original wooden box and manual
Notes: Effective scale length approx 30 ft.

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