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Quadrant, 1756.

Quadrant, 1756.
3 3 c m
actual image size: 32cm x 25cm


This quadrant was produced as a paper plate for a book which could be removed and pasted on to a board. It was designed in 1700 by John Rowley, but was out of date in 1756 when it was published, since it is based on the old calendar. A star was viewed through the sights, and a plumb bob gave its altitude. The positions of principal stars and other astronomical and mathematical data are also provided.

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© Science Museum / Science & Society Picture Library

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