At a glance
- Period
- 18th century
- Place
- United Kingdom
The watchmaking story
Useful places to start with John Harrison's work include H1, H2, H3, and H4. 1
Scope: Direct watchmaking
Why this person is included
Museum-documented foundational contribution
Background and working context
Affiliations and workshops: Independent maker
Documented origin: Yorkshire, England 12
Geographic ties: United Kingdom. Documented workplace / industry location
Brands, workshops, and other relationships
- Unnamed independent practice · Inherited source-linked record; relationship classification reviewed, sources not reopened
Independent maker — Own watchmaking practice. Watchmaker and chronometer pioneer 123
Legacy affiliation: Independent maker. Person-level contribution: Developed successive marine timekeepers to address longitude at sea, culminating in the portable H4 timekeeper.
Original affiliation wording: Independent maker. No present-day employment or ownership inferred.
Evidence and limitations
This dossier connects 8 field-specific evidence records with 3 public sources. Known links only; full career not established
Claim qualifications (8)
- Full name: Scoped reread of existing institutional/association or maker biography. No current membership/employment inference; editorial role classification is not a verbatim credential. 1
- Noteworthy contribution: Scoped reread of existing institutional/association or maker biography. No current membership/employment inference; editorial role classification is not a verbatim credential. 1
- Representative work: Scoped reread of existing institutional/association or maker biography. No current membership/employment inference; editorial role classification is not a verbatim credential. 1
- Specific role: Scoped reread of existing institutional/association or maker biography. No current membership/employment inference; editorial role classification is not a verbatim credential. 1
- Documented origin: Scoped reread of existing institutional/association or maker biography. No current membership/employment inference; editorial role classification is not a verbatim credential. Historical value snapshot; current People value differs. Reconcile before reusing. Post-consolidation gap-resolution pass: historical value snapshot differs from the current People value; retain as audit history. 1
- Birth year: Year-level biography only; technical claims are supported separately by Royal Museums Greenwich. 2
- Death year: Year-level biography only; technical claims are supported separately by Royal Museums Greenwich. 2
- Documented origin: Year-level biography only; technical claims are supported separately by Royal Museums Greenwich. 2
Sources
- Longitude found – the story of Harrison's timekeepersRoyal Museums Greenwich · Museum / archive · Not stated
[S0058] Royal Museums Greenwich. "Longitude found – the story of Harrison's timekeepers." Not stated. https://www.rmg.co.uk/stories/time/harrisons-clocks-longitude-problem Accessed 2026-09-13.
Source context
Relationship to subject: Museum / archive custodian
How it was checked: Page opened; relevant text read
- John Harrison (1693–1776)The Seiko Museum Ginza · Museum / institutional biography · Not stated
[S0247] The Seiko Museum Ginza. "John Harrison (1693–1776)." Not stated. https://museum.seiko.co.jp/en/knowledge/inventors_02/ Accessed 2026-09-13.
Source context
Relationship to subject: Institutional historical biography
How it was checked: Web page opened; relevant text inspected
Limitation: Used only for life years and Yorkshire origin. The page's wider technical and longitude narrative was not adopted.
- https://www.rmg.co.uk/stories/time/harrisons-clocks-longitude-problem https://museum.seiko.co.jp/en/knowledge/inventors_02/linked source
Corrections and stronger evidence
Names, dates, and workshop relationships can change as archives are digitised. If you have a primary source that clarifies this record, use the correction process.
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