Astronomical quadrant Size:XS: 25 x 20cm after the Royal Exchange was

after the Royal Exchange was destroyed by fire in 1838

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The woman on the left is wearing a mantle over her dress

Anarchy and lawlessness were rife

Astronomical quadrant Size:XS: 25 x 20cm after the Royal Exchange wasA 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