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Allan Harris of QPR
American Wonders
12th August 1968
The plate is inscribed 'Pl
Scene showing William Boyd
Astronomical quadrant Size:XL: 100 x 75cm Allan Harris of QPRA 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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