1767 John Harrison & marine timekeeper H4
Numéro d’image : 11598302
| John Harrison,English clockmaker and inventor of the marine chronometer that solved the longitude problem (b. 24 March 1693 - d. 24 March 1776). An engraving by W. Holl in "The Gallery of Portraits" 1835,with later colouring,from an engraving by Tassaert - itself from a painting by Thomas King 1767. Harrison with his famous watch 'H4' that solved the marine longitude problem by keeping time accurately enough to gauge Greenwich noon during a long voyage. The watch became embroiled in a dispute when the Board,responsible for awarding the longitude prize,took it for further testing. Their concern was that its accuracy was a freak and could not be duplicated by another watch of the same design. Partly this was a result of their own bias towards astronomical methods of longitude reckoning. A copy of H4 (K1) was used on Cook's second and third voyage and he praised its accuracy | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Stewart, Paul D. |
| Taille de l’image : | 3761 px × 4647 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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