![JOHN HARRISON AND THE CALCULATION OF LONGITUDE "The inventor of the marine chronometer" - PERPETUAL PASSION JOHN HARRISON AND THE CALCULATION OF LONGITUDE "The inventor of the marine chronometer" - PERPETUAL PASSION](https://www.perpetualpassion.com/wp-content/uploads/2018/04/large-1-e1522833725342.jpg)
JOHN HARRISON AND THE CALCULATION OF LONGITUDE "The inventor of the marine chronometer" - PERPETUAL PASSION
![John Harrison's first marine timekeeper, 1735. It took self-taught English clockmaker John Harrison (1693-1776) five years to build Harrison Number One or H1, which kept time so precisely that navigators were able John Harrison's first marine timekeeper, 1735. It took self-taught English clockmaker John Harrison (1693-1776) five years to build Harrison Number One or H1, which kept time so precisely that navigators were able](https://c8.alamy.com/comp/G15J2D/john-harrisons-first-marine-timekeeper-1735-it-took-self-taught-english-G15J2D.jpg)
John Harrison's first marine timekeeper, 1735. It took self-taught English clockmaker John Harrison (1693-1776) five years to build Harrison Number One or H1, which kept time so precisely that navigators were able
![John Harrison,inventor del primer cronometro marino de alta precisión,con su cronometro H-4 en 1.764. | Cronómetro marino, Cronómetro, Inventos John Harrison,inventor del primer cronometro marino de alta precisión,con su cronometro H-4 en 1.764. | Cronómetro marino, Cronómetro, Inventos](https://i.pinimg.com/736x/aa/a0/b7/aaa0b7f6b1d55939854f6a20e0cb8298.jpg)