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You are here: Home / Ein Casgliad / Gwrthrychau Morwrol / Cronomedr

Cronomedr

Chronometer

Er mwyn cyfrifo lledred ar wyneb y ddaear, mae’n rhaid bod Amser Safonol Greenwich cywir ar gael.

Mae’r cronomedr neu’r cloc llong hwn, a wnaed gan B. R. Hennessy o Abertawe, yn gloc sbring-yriant trachywir.

Mae symudiadau cwarts modern yn golygu bod clociau fel hyn wedi darfod amdanynt.

Cedwir yr eitem hon yng Nghanolfan Gasgliadau Amgueddfa Abertawe yng Nglandŵr, yn Storfeydd yr Amgueddfa.

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