Heath & Co. Carmody Navigational Slide Rule

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Country of manufacture: England,            Date of manufacture: ____
Overall length: 31.0 cm,          Width: 3.7 cm,           Weight: 111.8 gms
Materials: all plastic; closed form simplex
Cursor: 3.7 X 3.6 X 0,5 cm; all plastic;        lines: three
Scales: 12, extensions on A, B, C, R, D
Front: 0-10 in // U.L., A [ B, R, C ] D, L.L.
Back: 0-25 cm, Table of Natural Haversines and differentials
Slide Back: S, ST, T
Gauge Marks: [ π, δ (.984), Z (1.15), σ (291), H (.565), Q (232; unknown) ]
Condition: C5 (Normal signs of use)
Came with: Orig. black wooden hinged case

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