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Refracting telescope on stand by Ramsden, Dollond and Miller, 1769

Refracting telescope on stand by Ramsden, Dollond and Miller, 1769

1769
Mahogany and brass sextant.

Mahogany and brass sextant.

1785-1795
Pocket brass framed sextant

Pocket brass framed sextant

1785-1795
Achromatic prospect glass telescope

Achromatic prospect glass telescope

1795-1805
Double image wedge micrometer by Dollond

Double image wedge micrometer by Dollond

1754-1769
Selection of eyepieces and other accessories in fitted mahogany case for (Smyth) refracting telescope

Selection of eyepieces and other accessories in fitted mahogany case for (Smyth) refracting telescope

1830
Split object-glass micrometer by Dollond

Split object-glass micrometer by Dollond

1760-1800
Achromatic prospect glass telescope

Achromatic prospect glass telescope

1795-1805
Solar microscope with screwbarrel

Solar microscope with screwbarrel

1750-1775
Dip circle with 11 inch needle, c 1820.

Dip circle with 11 inch needle, c 1820.

1820
split object-glass micrometer, 1760-1780

split object-glass micrometer, 1760-1780

1760-1800
Divided object-lens micrometer by Peter Dollond for cassegrain reflecting Telescope of 2 1/2-inch aperture

Divided object-lens micrometer by Peter Dollond for cassegrain reflecting Telescope of 2 1/2-inch aperture

1754-1757
Mahogany case for double-image object glass micrometer by Dollond

Mahogany case for double-image object glass micrometer by Dollond

1754-1770
Ramsden's astronomical equatorial instrument, with 2-1/4 inch aperture and 18-inch focal length

Ramsden's astronomical equatorial instrument, with 2-1/4 inch aperture and 18-inch focal length

1770-1780
Mahogany case, for split object-glass micrometer

Mahogany case, for split object-glass micrometer

1760-1800
Transit instrument of 3-inch aperture and focal length of 42 inches, with striding level by Dollond. This Royal Society instrument was used by Captain Kater for his experiments on the pendulum at the principal stations of his trigonometrical survey.

Transit instrument of 3-inch aperture and focal length of 42 inches

1815-1818
Double image object glass micrometer by Dollond, engraved Dollond, London.

Double image object glass micrometer by Dollond

1754-1770
Ellis type aquatic microscope, by Peter Dollond, London, England, c. 1765; in fishskin case with accessories: 3 objective lenses, 3 bone slides, 1 ivory container, 2 pieces of glass, 1 pair of tweezers, 1 adjustable probe, 1 spare crosspiece for mounting microscope. Compound and simple microscope attachments.

Ellis type aquatic microscope

Dip circle, 11 inch needle, by Dollond, c.1820

Dip circle with 11 inch needle, c 1820.

1820
Double-image object glass micrometer by Dollond, engraved Dollond, London with mahogany case.

Double-image object glass micrometer by Dollond

1754-1770
Transit instrument of 3-inch aperture and focal length of 42 inches, with striding level by Dollond with wooden case. This Royal Society instrument was used by Captain Kater for his experiments on the pendulum at the principal stations of his trigonometrical survey.

Transit instrument of 3-inch aperture and focal length of 42 inches

1815-1819
Brass quadrant of 18-inch radius on a tripod stand, with levelling screws and two telescopes.

Brass quadrant of 18-inch radius on a tripod stand

1780-1820
Pocket brass framed sextant, with mahogany keystone box, made by Jesse Ramsden, Piccadilly, London, England, 1785-1795. Polished brass frame and limb, no handle. Signed on the crossbar: ‘Ramsden London’. Brass scale from -2° to 145° every 30', measuring to 125° (digits read from the pivot). Brass vernier to 1', zero at the left. The tangent screw is on the front of the index arm; the clamping screw is on the back. Two shades (both red); no horizon shades. Index-glass adjustment by screw; adjustment of the horizon glass by fixed milled screw and by Dollond's extended lever and clamp, operated from beneath the telescope bracket. Detached telescope bracket, to be fit to the frame by a dovetail mount; perpendicular adjustment by rising-piece and a milled screw. Detached magnifier on a 35-mm swivelling arm. Telescope (62 mm) erect image. Shaded eyepiece (red).

Pocket brass framed sextant

1785-1795
Brass quadrant of 18-inch radius on a tripod stand, with levelling screws and two telescopes.

Brass quadrant of 18-inch radius on a tripod stand

1780-1820
Astronomical refractor with 3 3/5-inch (92mm) triplet objective of 45-inch focal length by Peter Dollond, without stand [RAS No.16]. Used by the Rev. Francis Wollaston (c.1770-1820) and presented to the Royal Astronomical Society in 1828 by William Hyde Wollaston. Later given to the British Astronomical Association in 1957.

Astronomical refractor with 3 3/5-inch (92mm) triplet objective of 45-inch focal length by Peter Dollond

1771
Ramsden's patent (No.1112, 1775, Dec.30) Astronomical Equatorial Instrument with glazed Sheraton case, c.1775. Refracting telescope, 2-1/4 inch aperture and 18-inch focal length (probably by Peter Dollond), on an adjustable equatorial mounting with tripod stand. The stand is equipped with 3 spirit levels, 3 levelling screws and 2 scales read by verniers. Accessories include 5 eyepieces, two diagonal mirrors, glass prism, two dark filter caps and a filar micrometer with reflector to illuminate the cross hairs.

Ramsden's patent (No.1112, 1775, Dec.30) Astronomical Equatorial Instrument, with equatorial mounting, accessories, tripod and case

1770-1780
Astronomical refractor with 3 3/5-inch (92mm) triplet objective of 45-inch focal length by Peter Dollond, without stand [RAS No.16]. Used by the Rev. Francis Wollaston (c.1770-1820) and presented to the Royal Astronomical Society in 1828 by William Hyde Wollaston. Later given to the British Astronomical Association in 1957.

Astronomical refractor with 3 3/5-inch (92mm) triplet objective of 45-inch focal length by Peter Dollond

1771