Astronomical quadrant mb-width 3790 Buckingham Palace forecourt

Buckingham Palace forecourt

boats with wheels and boats transformed into sledges

'Ladies buy your leaf

View of the east end of the church before restoration

Showing an improvement proposal for sea-water swimming pools

Astronomical quadrant mb-width 3790 Buckingham Palace forecourtA 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