Greenwich Observatorium

Source: A.B. Clayton

Description

Museet viser fire marine kronometre udviklet af John Harrison. Disse blev brugt til at beregne længdegraden, mens man rejste over havet. Ved at sammenligne den lokale tid med tiden på kronometeret og tiden fra 'hjem' eller et referencepunkt, kunne rejsende beregne længdegraden på Jorden.

Indtil 1760 var der ingen præcise ure, der kunne rejse over havet. I 1707 var en stor del af den engelske flåde blevet strandet på et rev. Dette fik Admiraliteten til at handle. De lovede en belønning på £ 20.000 for et mere pålideligt kronometer. I 1736 skabte den ukendte urmager John Harrison Timekeeper No. 1. Uret var omkring en meter højt og vejede 36 kg. Admiraliteten fandt monsteret for stort og klodset. Så den geniale Harrison byggede i 1760 et nyt.

Elleve år senere blev kronometeret bevist til søs, og Harrison modtog de lovede £ 20.000.

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Contact information

Address: Greenwich, United Kingdom

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Source: A.B. Clayton

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Source: A.B. Clayton

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