Epact Scientific Instruments of Medieval and Renaissance Europe

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Glossary

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152 to 156 of 227 glossary terms

plumb line: a suspended thread with a weight at its end, indicating the vertical.

plummet: a form of plumb line in which the 'line' and weight are a single rigid piece.

polar dial: type of sundial, see article on the sundial.

polyhedral dial: sundial with hour lines on various faces of a solid figure, see article on the sundial.

prime vertical: celestial great circle passing through the east and west points and the zenith.

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