The Oxford History of Science Museum's own exhibition page independently dates Jevons's surviving Logic Machine to 1869
The History of Science Museum, University of Oxford — which holds the surviving Logic Piano, presented on the same page under catalogue reference HSM catalogue-6547 (the page records no bequest or acquisition history; corrected 2026-08-11, see audit_status) — states on its "Imagining AI" exhibition page: "Logic Machine by W. Stanley Jevons — Made in 1869 to William Stanley Jevons's design, this forerunner of the computer could solve logical problems by 'playing' them on the keyboard."
This corroborates the 1869 construction date independently of Jevons's own 1870 paper: different author (an institution rather than Jevons himself), different venue (an object catalog/exhibition page rather than a scientific journal), and a different kind of record (physical-object provenance rather than a scientific author's self-report). Paired with claim-jevons-1870-paper-received-16-oct-1869-read-20-jan-1870-royal-society, the 1869 build date now rests on two independent Tier 1–2 lines rather than one, and both supersede the Tier 4 Wikipedia sourcing claim-jevons-logic-piano-1869-mechanical-inference-machine originally carried.
The museum's page links onward to a Computer History Museum blog post ("Logical Piano Lessons," by historian David E. Dunning) and a video Show-and-Tell of the object — neither fetched this session, recorded as further leads rather than corroboration.
Source
“Logic Machine by W. Stanley Jevons — Made in 1869 to William Stanley Jevons's design, this forerunner of the computer could solve logical problems by 'playing' them on the keyboard.”
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