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Transit circle by Edward Troughton, London, with a micrometer eyepiece and accessories

Transit circle by Edward Troughton, London, with a micrometer eyepiece and accessories

1806
Brass framed repeating circle with case.

Brass framed repeating circle with case.

1815-1825
Brass pillar-frame sextant.

Brass pillar-frame sextant.

1810-1820
Ebony and brass sextant.

Ebony and brass sextant.

1785-1795
Mahogany and brass octant.

Mahogany and brass octant.

1775-1785
Sector by Troughton

Sector by Troughton

1801-1830
"Souths" balance

"Souths" balance

Zenith sector telescope by Edward Troughton, London, 1800-1822. Used in America and later in Denmark

Zenith sector telescope, British, 1800-1822, with components

1800-1822
Hassler's reflecting circle, 11-inch diameter with counterpoise stand, by Troughton, London in case, no key [RAS No.43, Sheepshanks No.17]. Presented to the Royal Astronomical Society in 1857 by Miss Anne Sheepshanks sister of Rev. Richard Sheepshanks.

Hassler type reflecting circle with case.

1790-1826
Altazimuth theodolite, 4.5-inch, with box, by Edward Troughton, Fleet St., London, England, 1780-1826

Altazimuth theodolite, 1780-1826

1780-1826
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
Circular instrument dividing engine made by Edward Troughton, London, England in 1793 and described by him in 1809. It was later modified by William Simms, his business partner after 1826, with the additional of a self-acting mechanism, the details of which Simms published in 1843. The engine has a 34-inch cast brass dividing plate with 2,160 teeth and a worm with 20 threads to the inch, all mounted on a wooden tripod base.

Circular instrument dividing engine.

1793
Drawing in glazed frame of an early transit instrument made by Edward Troughton for his friend, Sir James South [see 1931-352].

Drawing in glazed frame of an early transit instrument made by Edward Troughton

1820
18-inch reflecting circle made by "Troughton, London" with counterbalanced stand and tripod base with accessories

Reflecting circle with stand

1790-1826
Circular protractor by Edward Troughton, London, 9 inch with folding arms, divided on silver to 1/3 degree reading by vernier to 1-inch, engraved "Troughton, London" & "F^O 40", in case

Circular protractor by Edward Troughton

Beam compasses by Ed. Troughton (1753-1835)

Beam compasses by Ed. Troughton (1753-1835)

Reflecting circle made by Edward Troughton, London, about 1823. Signed on the index arm: Troughton | 219 | London. Polished brass limb with inlaid silver scale from 140° to 0° to 140°; the entire circle is divided every 20'. Three silver verniers reading to 20", zeros at the left. Circular lacquered brass frame with a wooden handle. A detached U-shaped bracket holds a second handle with a brass-lined threaded hole for a third handle, which can also be screwed on the front of the frame. Three rigidly connected index arms on the back of the frame, a double-ended tangent screw and clamping screw are on the back of one of the arms. Three shades (two red, one green); three horizon shades ( two red, one green). Index glass without adjustment; adjustment of the horizon glass by a screw and a capstan screw. One detached magnifier on a 55 mm swivelling arm, for all three verniers. Threaded telescope bracket in two parts, fitted for correcting collimation error; perpendicular adjustment by rising-piece and a milled collar. Telescope (77 mm) erect image; telescope (179 mm) inverted image two parallel cross-wires; extra draw tube (90 mm) inverted image; extra draw tube (90 mm) inverted image, two parallel cross-wires. Sight tube (132 mm); sight tube (131 mm, probably from a different instrument); three shaded eyepieces (one red, two orange); a magnifying glass. Three unidentified parts. Box not seen WMB. The circle is mounted on a lacquered brass column on a tripod stand with three milled levelling screws. The counterbalanced swinging mount can be locked into the desired position by milled screws.

Brass framed reflecting circle with case.

1820-1825
7 inch altazimuth theodolite by Troughton, early 19th century

7 inch altazimuth theodolite by Troughton

1801-1850
Refracting telescope of 2 1/4 inch aperture and 36 inch focal length by Troughton, London on an adjustable equatorial mounting with spirit level and tripod stand and box. Accessories include, 2 eyepieces, key , diagonal and filar micrometer.

Refracting telescope of 2 1/4 inch aperture and 36 inch focal length by Troughton

1790-1826
Case for 18-inch reflecting circle and artifical horizon with boxwood mercury bottle

Case for reflecting circle with stand and artifical horizon.

1790-1826
Artifical horizon and cover with boxwood mercury bottle for 18-inch reflecting circle

Artificial mercury horizon for reflecting circle.

1790-1826