Description

Behind can be seen Lord Derby's crown and

Interior view of the dining room at Charterhouse

Fordhook House

by Sydney Parkinson (London

Astronomical quadrant Product:Fine art poster Behind can be seen LordA 12 inch astronomical quadrant made by John Bird. Astronomical quadrants were used to measure the angle of a celestial object from the zenith. Operated in conjunction with a transit instrument, they could be used to check the running rate of astronomical clocks known as regulators. At sea a quadrant can be used to help fix a ship's position and to determine latitude. ca. 1767

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Astronomical quadrant Product:Fine art poster Behind can be seen Lord

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