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Home > Objects > Cronòmetre

Cronòmetre

Description: Caixa de fusta amb tapa, tancadura i inscripció frontal i anses laterals de metall. A l´interior en suspensió de ´cardari ´el rellotge d´esfera blanca amb xifres horàries romanes i minutera àrab. Al centre de l´esfera inscripció de la casa de fabricació, marca i ciutat: Parkinson Frodshom change Alley London 2831. El rellotge protegit per un vidre i a la tapa interior un mirall per veure el rellotge.
Inventory: 00315
Place of production: Londres
Material: Fusta
Metall
Vidre
Technique: Caixa: Emmetxar
Guarnicions: Fosa
Caixa: Marqueteria
Measurement: Caixa: Altura = 20 cm
Profunditat = 19 cm
Amplària = 19 cm
Cultural context: Edat contemporània
Chronology: 1845
Generic classification: Instruments científics
Reasoned classification: Aquest tipus de cronòmetre servia per medir la longitud quan un vaixell sortia d´un port. A través de l´hora del port i l´hora astronòmica es podia saber la longitud. El rellotger anglès George Harrison va descobrir la longitud, ja que abans de 1730 els vaixells nomès podien calcular la latitud. Harrison va calcular l´hora del vaixell en el lloc amb l´hora astronòmica i amb un tipus de rellotge semblant a aquest va poder calcular la longitud.

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