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Observatory regulator, 1676. The chapter ring is calibrated in hours, with an outer ring divided into minute divisions, all numbered and calibrated from 1 to 60 twice (for a minute hand completing one rotation in two hours). The subsidiary dial above is for seconds, divided into single seconds and also numbered from 1 to 60 twice (for a second hand completing one rotation in two minutes).
Location
British Museum/London/Great Britain
Unique Identifier
ART303297
Type
Image
Purpose
Public
Size
4170px × 4183px
Photo Credit
© The Trustees of the British Museum / Art Resource, NY
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Tags
17th century CE
Clock
Minor Arts
Royal Observatory, Greenwich, Great Britain