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Artificial horizon of black glass

1830-1860
Platinotype print of plate of quadrant, from "Margarita Philosophica" 1535, p. 1345

Platinotype print of plate of quadrant

1914
18 inch repeating circle, by Troughton, engraved F5TO, 3 eyepieces 3 dark glasses, 1 plumb bob, 4 brass clips, 2 brass labels with chains, instrument is exhibited on stand with 3 levelling screws, circles are divided into twelths of a degree and read to 5" arc by vernier

18 inch repeating circle

1790-1826
Vertical repeating circle with stand of 8-inch diameter, with diagonal telescope and case (no key), by Troughton and Simms [RAS No. 39, Sheepshank No.13]. Presented to the Royal Astronomical Society in 1857 by Miss Anne Sheepshanks sister of the Rev. Richard Sheepshanks.

Vertical repeating circle with stand of 8-inch diameter

1824-1855
Artificial horizon; black glass 2 1/8" with 3 levelling screws, in black fish-skin case, with level (not original)

Artificial horizon; black glass 2 1/8" with 3 levelling screws

1840-1860