Astronomical quadrant mb-width 3790 flowers and leaves of Astragalus

flowers and leaves of Astragalus caulescens

National Discount Company's offices

showing James Broughton and another fighter at Marylebone Fields

'Ladies buy your leaf

Showing an improvement proposal for sea-water swimming pools

Astronomical quadrant mb-width 3790 flowers and leaves of AstragalusA 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