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2026-09-20

How 35 keys ended the slide rule

Retired Tech Museum Catalog
Retired Tech Museum Catalog@yuzichen13
HP-35 put logs, sines and powers in a shirt pocket, and retired the slide rule in a year. A charge lasted about three hours. 123456

References

  1. 1
    Hewlett-Packard — HP Virtual Museum: HP-35 handheld scientific calculator, 1972

    hp.com

  2. 2
    Smithsonian Institution — Hewlett-Packard HP-35 Handheld Electronic Calculator

    si.edu

  3. 3
    IEEE / ETHW — Milestone: Development of the HP-35, the First Handheld Scientific Calculator, 1972

    ethw.org

  4. 4
    The Henry Ford — Sparking Innovation: HP-35 Calculator

    thehenryford.org

  5. 5
    HP History — HP 35: Marketed to the Consumer

    hewlettpackardhistory.com

  6. 6
    Wikipedia — HP-35

    en.wikipedia.org

Retired Tech Museum Catalog
Retired Tech Museum Catalog@yuzichen13

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