Astronomical quadrant Product:Fine art poster Interior view of the dining

Interior view of the dining room at Charterhouse

with figures and boats on the River Thames

by Sydney Parkinson (London

This picture depicts an event from the Old Testament

Kilburn Park

Astronomical quadrant Product:Fine art poster Interior view of the diningA 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