John Harrison: Perbedaan antara revisi

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* [https://web.archive.org/web/20081219102103/http://www.nmm.ac.uk/upload/pdf/Gould-Harrison-longitude-JBetts.pdf Excerpt from: Time Restored: The Story of the Harrison Timekeepers and R.T. Gould, 'The Man who Knew (almost) Everything']
* [https://www.telegraph.co.uk/news/uknews/1510333/Clock-from-1776-just-goes-on-and-on.html UK Telegraph: 'Clock from 1776 just goes on and on']
* [https://www.independent.co.uk/news/science/longitude-pioneer-was-not-a-lone-genius-1693503.html Andrew Johnson, ''Longitude pioneer was not a 'lone genius','' The Independent, 31 May 2009] {{Webarchive|url=https://www.webcitation.org/65Nx8vM7R?url=http://www.independent.co.uk/news/science/longitude-pioneer-was-not-a-lone-genius-1693503.html |date=2012-02-12 }}
* [http://www.thepirateking.com/bios/harrison_john.htm Excellent accounting of John Harrison and his H1, H2, H3 Achievements]
* [http://www.bbc.co.uk/ahistoryoftheworld/objects/arSAQ-UETSOyftkNWZTpVQ Harrison's precision pendulum-clock No. 2, 1727, on the BBC's "A History of the World" website]