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Filar micrometer by William Herschel, 1780-1800

Filar micrometer by William Herschel, 1780-1800

1780-1800
Cassegrain reflecting telescope, 1762-1774

Cassegrain reflecting telescope, 1762-1774

1762-1774
Brass filar micrometer for astronomical telescope

Brass filar micrometer for astronomical telescope

1751-1773
Positional filar micrometer by John Browning

Positional filar micrometer by John Browning

1875-1900
Trifilar eyepiece micrometer in brass

Trifilar eyepiece micrometer in brass

1775-1800
Brass moving wire filar micrometer by J. Sissons

Brass moving wire filar micrometer by J. Sissons

1740-1760
Wire micrometer

Wire micrometer

Portable transit instrument with striding level and accessories

Portable transit instrument with striding level and accessories

1816-1850
split object-glass micrometer, 1760-1780

split object-glass micrometer, 1760-1780

1760-1800
brass moving wire micrometer, 1740-1760

brass moving wire micrometer, 1740-1760

1740-1760
Part of surveying level, British, 1841

Part of surveying level, British, 1841

1841
Smythian telescope, refractor of 3 3/4 inch aperture, 50 inch focal length

Smythian telescope, refractor of 3 3/4 inch aperture, 50 inch focal length

1825-1829
Case, with accessories for Powell and Lealand No.1 microscope, 1874

Case, with accessories for Powell and Lealand No.1 microscope, 1874

1874
Eye-piece micrometer inscribed E.6 in wood mount with brass frame divided circle (120 divisions numbered from 0 degree to 60 degrees) and steel screw, 2 threads in position

Filar micrometer by William Herschel, 1780-1800

1780-1800
Filar micrometer, part of refracting telescope by John Smeaton on equatorial mounting with stand [RAS No.7] . Presented to Royal Astronomical Society in 1845 by Mrs Sommerville to whom it was left by Mrs Dixon, Smeaton's daughter.

Filar micrometer, from John Smeaton's refracting telescope

1770
Portable transit instrument of 2¼-inch aperture by Thomas Jones, London, with striding level, lamp and glass screen in a fitted box. Accessories include 7 glass levels, 1 magnifier, 2 eyepieces, 2 dark slides and a micrometer slide.

Portable transit instrument of 2¼-inch aperture by Thomas Jones

1816-1850
Surveyor's level, 23-inch (without tripod stand), by Troughton & Simms, London, England, 1841. Fitted with 12-inch alcohol bubble level, magnetic compass and filar micrometer. Used for 1st order levelling

Surveying level, British, 1841t, with accessories

1841
Early filar micrometer in leather case, Italian, 1700-1799.

Early filar micrometer in leather case

1700-1799
Refracting telescope of 1 1/2-inch aperture and 36-inch focal length by John Smeaton on an adjustable equatorial mounting with a tripod stand. The telescope is fitted with an integral filar micrometer [RAS No.7] . Presented to Royal Astronomical Society in 1845 by Mrs Somerville to whom it was left by Mrs Dixon, Smeaton's daughter.

Refracting telescope of 1 1/2-inch aperture and 36-inch focal length

1770
Accessories for Ramsden astronomical equatorial instrument, consisting of four eyepieces, two mirror digonals, a glass diagonal, two dark filter caps and a filar micrometer and reflector to illuminate the cross-hairs. Other miscellaneous parts include a small adjustor, loose parts in two pill boxes, a boxwood lid and a detached bar of unknown function.

Accessories for Ramsden astronomical equatorial instrument

1770-1780
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
Smythian telescope, c.1824, a refractor of 3 3/4 inch aperture and 50 inch focal length by Thomas Robinson, Portland Place, London with optics by Charles Tulley in fitted box but without equatorial mount or stand. Separate fitted box contains 6 astronomical eyepieces, terrestrial eyepiece, cometary eyepiece, filter wheel, Herschel wedge, split-lens micrometer by Dollond, double-image micrometer by Thomas Robinson and related items including an occulting bar, graticle and ring (annular) micrometer. First used by Capt. W. H. Smyth at Bedford then given by him to Dr Lee at Hartwell House in 1828, later used by Dr N R Pogson from 1857 until 1860 at the Radcliffe and Hartwell Observatories and then at the Madras Observatory, India until 1891. Presented to the British Astronomical Association by the widow of Dr C. Michie Smith.

Smythian telescope, c.1824, a refractor of 3 3/4 inch aperture, 50 inch focal length, and accessories

1825-1829
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
1 P & L goniometer eyepiece, 1 P & L Filar micrometer eyepiece, 1 P & L coverglass micrometer, 1 P & L substage condenser, 1 P & L Nicol prism, 1 Zeiss Browning eyepiece spectroscope, 1 set Leitz objective changers

Microscope accessories by Zeiss, Powell & Lealand, and Leitz