TIL in 1714 the British government offered £20K (~£2m today) to solve the longitude problem - which had cost thousands of lives due to a lack of ship positioning. John Harrison, a
The First Global Positioning System Was This Marine Chronometer Watch | Pendant watches, Antique watches, Chronometer watch
H4 | Royal Museums Greenwich
1854 John Harrison Silver Fusee Pocket Watch - Watches - Pocket & Fob - Horology (Clocks & watches)
H4 | Royal Museums Greenwich
In-Depth: The Microscopic Magic of H4, Harrison's First Sea Watch | SJX Watches
Chrome H4 Inspired Pocket Watch | Pocket Watches | RMG Shop – Royal Museums Greenwich Shop
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Lot - A John Harrison open-face pocket watch
Marine Timekeeper known as 'H5' by John Harrison and Son 1770 | Science Museum Group Collection
John Harrison - Wikipedia
A portrait of Mr Harrison and his timekeepers - Science Museum Blog
Marine Timekeeper known as 'H5' by John Harrison and Son 1770 | Science Museum Group Collection
Royal Observatory Greenwich John Harrison's H4-Inspired Gold Pocket Wa – Smartify
Mid-19th century silver fusee lever pocket watch, London 1846, the movement signed John Harrison, Liverpool, no. 31321, with Massey type III escapement, engraved balance cock, diamond endstone, steel three arm balance' Bosley
Harrison's H4 Inspired Chrome Pocket Watch || PressFix || PressFix.co (Formerly Gift Guide Portal)
Royal Observatory Greenwich Harrison's H4-Inspired Gold Pocket Watch | RMG Shop – Royal Museums Greenwich Shop
Derek Pratt's Reconstruction Of John Harrison's H4, The World's First Precision Marine Chronometer (Part 1 of 3) - Quill & Pad
H4 | Royal Museums Greenwich
Bonhams : John Harrison, Liverpool. An 18ct gold key wind full hunter pocket watch Movement No.9215, Chester Hallmark for 1837
John Harrison Liverpool - Wrist and Pocket Watches 2018/11/30 - Realized price: EUR 1,875 - Dorotheum
H4 | Royal Museums Greenwich
Royal Observatory Greenwich John Harrison's H4-Inspired Chrome Pocket – Smartify
Attractive 19th century 18ct engine turned pocket watch, Chester 1833, the fusee detached lever movement signed 'By John Harrison, Liverpool' with engraved balance cock, diamond endstone, regulator and gilt three arm balance,
The John Harrison Foundation for the Study of Timekeeping Practices - H4: The Ultimate Achievement By 1755 John Harrison had been attacking the Longitude Problem for twenty-seven years. H3 had been abandoned
