Slide Rules

K&E 4081-3 Log Log Duplex Decitrig

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    Volumes

    1. Vol 1 K&E 4081-3 Log Log Duplex Decitrig — Volume 1 — The Engineer's Rule Where the 4081 came from, how its scale set changed between 1937 and 1972, and how to date one from its serial number
    2. Vol 2 K&E 4081-3 Log Log Duplex Decitrig — Volume 2 — Anatomy and Every Scale Mahogany, celluloid and aluminium; twenty-one scales on two faces; and the small range legends that place the decimal point
    3. Vol 3 K&E 4081-3 Log Log Duplex Decitrig — Volume 3 — Using It, and Caring for It Eleven worked problems across both faces, every answer checked, then how to clean, adjust and store a celluloid-on-mahogany K&E