Posts Tagged ‘marine clock’


Wednesday, August 9th, 2017

‘But by reason of the motion of the Ship, the Variation of Heat and Cold, Wet and Dry, and the Difference of Gravity in different Latitudes, such a watch hath not yet been made”. And not likely to be, either, he implied’.  Isaac Newton cited, Dava Sobel, Longitude, Fourth Estate, London, 1998

‘Not likely’ – not so – as early as 1736, on a timed voyage, England to Lisbon aboard HMS Centurian, H-1 a marine clock had shown itself a reliable time-keeper.

‘He [Harrison] succeeded, against all odds, in using the fourth – temporal – dimension to link points on the three-dimensional globe’. Sobel ibid.

Accurate time-keeping was essential to the calculation of longitude that gave a ship’s precise position at sea when beyond sight of land.

‘John Harrison, the man who solved longitude in 1759’. Peter Ackroyd, Revolution, Macmillan, 2016

Harrison was the carpenter from Yorkshire whose invention, the sea-going watch, solved the problem of longitude.