Slide Rules

K&E 4071-3 Duplex Decitrig

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sten gun
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    Volumes

    1. Vol 1 K&E 4071-3 Polyphase Duplex Decitrig — Volume 1 — The Log Log's Plainer Sibling K&E's general-purpose duplex of 1939–1967: what it was for, how it changed, and why my example is probably ten years older than its serial number suggests
    2. Vol 2 K&E 4071-3 Polyphase Duplex Decitrig — Volume 2 — Anatomy and Every Scale Fifteen scales on two faces of celluloid-covered mahogany, a pre-1956 glass cursor, and the old ST scale that dates the rule
    3. Vol 3 K&E 4071-3 Polyphase Duplex Decitrig — Volume 3 — Using It, and Caring for It Nine worked problems without log-log scales, every answer checked; then cleaning a 1950s K&E and replacing a cracked glass cursor window