Pay in 4 interest-free payments of $4.49 Learn more
Ships within 48 hours · Estimated delivery Aug 12 - Aug 17
later as Balenus hameri with two enlarged details A-B showing open and closed states
12th August 1968
22nd August 1983
The plate is inscribed 'Pl
'Swearing at Highgate'
Astronomical quadrant Size:XL: 100 x 75cm later as Balenus hameri withA 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
