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
Hand speculum grinding/polishing machine constructed and used by Sir W. Herschel for polishing specula of 6-inch aperture. Hand speculum grinding/polishing machine 1780-1820
Newtonian reflecting telescope of 10-foot focal length, made by William Herschel, England, 1812. The telescope has an 8-inch speculum mirror, mahogany tube and altazimuth stand. It was installed at the Radcliffe Observatory, Oxford, in 1813. Newtonian reflecting telescope made by William Herschel for the Radcliffe Observatory 1812
[Building the Disley Tunnel on the New Mills to Heaton Mersey branch of the Midland Railway/G. S. F. Rutty.] 1899. [Drafts of a paper on the construction of the Disley Tunnel dealing with the technical details of tunnellingWith 18 photos of the New Mills - Heaton Mersey branch nearing completion. 41 leaves ms.] Includes photographic prints. Building the Disley Tunnel on the New Mills to Heaton 1899
[Note, 1791, to Sir William Hamilton / Dr [William] Herschel, asking him to assist in persuading King of Naples to have one of Herschel's 20ft telescopes erected in Naples for astronomical observations to be taken. 1p. With offprint from Journal of Royal Astron. Soc. of Canada describing the letter and its significance] Note, 1791, to Sir William Hamilton 1791
[Letter] 1800 Mar 20, Slough [to an unnamed correspondent]/William Herschel. [Refers to his solar observations which "have lately connected caloric with light"; is waiting for better weather to complete experiments which will "go to clear up our conceptions about caloric".] Letter 1800 Mar 20 1800
Six and a half inch glass mirror in original brass cell, with close fitting tin cap with handle cell 1 1/16" deep outside, exact focal length 7ft 1.75 in, "D" painted on cell and lid Six and a half inch glass mirror in original brass cell 1780-1820
The first 48-inch speculum mirror cast with metal cover by Sir William Herschel in 1785 for his 'Forty Foot' telescope at Slough, England. Original mirror for William Herschel's forty-foot telescope, 1785. 1785
Brass foot tool in painted tinplate case used by William Herschel to polish his metal speculum mirrors used in his telescopes. Brass foot tool in painted tinplate case 1770-1820
Pitch polisher used by William Herschel to polish his metal speculum mirrors used in his telescopes. Pitch polisher 1770-1820
Eyepiece in brass mount inscribed "63" and "320" focal length 0.825 - in 1 3/16 long 7/8 long, 7/8 in diameter Eyepiece in brass mount inscribed "63" and "320" focal length 0.825 - in 1 3/16 long 7/8 long 1780-1820
Nine inch mirror of speculum metal (exact diam" 8 15/16 in) in tin cell with close fitting cover 9 1/2" diam, 1 1/2" deep, focal length 10' 1", cell and cover each painted " J" Nine inch mirror of speculum metal (exact diam" 8 15/16 in) in tin cell with close fitting cover 9 1/2" diam 1780-1820
Elliptical plane mirror (diagonal flat for Newtonian telescope) minor axis 1 1/2", major axis 2" in (full) soldered in usual way to circular brass disc, cylindrical cover of brass 1 3/4" deep, cover of brass 1 3/4" deep, cover and brass disc inscribed 1 "A4" Elliptical plane mirror (diagonal flat for Newtonian telescope) minor axis 1 1/2" 1780-1820
Selection of twenty six eyepieces, in wooden mounts inscribed D1 to D26, no lens visible in D25 (possibly slipped between brass plates) Selection of 26 eyepieces by William Herschel, 1780-1800 1780-1800