356 SEC. 11. ASTRONOMY. 



1831a. Telescope, by Dolland. 



The telescope is the " Dollond," so often mentioned in Humboldt's 

 account of his travels in America. 



The sextant and the universal instruments was taken by Humboldt in 

 all his journeys in Asia and America, and on the former depend nearly all the 

 determinations of position. It contains an inscription to this effect, and in 

 the case may still be found the paper in Humboldt's handwriting with 

 instructions for the engraver. 



This instrument, together with No. 805, and No. 1766 form a portion of 

 the Humboldt collection, with which friends in Berlin enriched the new 

 observatory of Strasburg, erected in the year 1873. 



1831b. Telescope by Campani. 



Royal Museum at Cassel (Director, Dr. Pinder). 

 The tube is wood ; it measures, when drawn out, 16 feet. This was bought 

 in Rome by Landgrave Charles. 



183 Ic. Universal Instrument and Goniometer, by Ro- 

 binson. Prof. Winnecke, Strassburg. 



1831g. Two Telescopes (Achromatic), made by Dollond, 

 about 1765, for the Russian expeditions to observe the transit of 

 Venus in 1769. 



The Imperial Academy of Sciences, St. Petersburg. 



Object glasses of 3-6" and 2-8" aperture, focal length 11-2' and 8'5'. There 

 are several of each size in possession of the Academy. As they are not 

 designated by numbers or other distinct marks, it cannot exactly be made out 

 which of them has been used by the different observers. 



1832. Terrestrial Refractor, made by Van Deyl, at Am- 

 sterdam, in the year 1781. Foundation Teller at Haarlem. 



1833. The Herschel 7-foot Telescope. The original in- 

 strument constructed by Sir W. Herschel. 



Royal Astronomical Society. 



The tube is 7 inches in diameter and 7 feet long. Both mirrors were 

 finished by Sir W. Herschel's own hands ; they are sound and whole, but are 

 much tarnished, and the large mirror was damaged in a fire some years since. 

 The framework of the stand is entire, but the moving screws, cords, &c. are 

 useless in their present condition. 



1784a. Newtonian Telescope, belonging to Sir W. 

 Herschel, and used by him while living in Bath. He is said to 

 have discovered the planet Uranus by its means. Focus, 7 feet ; 

 diameter of speculum, 6^ inch. Edwin Smith. 



This telescope was purchased at Sir W. Watson's sale, Pulteney Street, 

 Bath, about 1860. It had apparently remained after Sir W. Watson's death 

 for some time in a lumber room of the house, and when purchased by Mr. E. 

 Smith, he discovered in the drawer of the stand a paper of directions for the 

 use of the different eye-pieces, which paper he encloses with this. 



Mr. Smith adds that there was a portrait in oil of Sir W. Herschel in one 

 of the rooms of the same house, which was sold at the same time. Dr. Brabant, 

 of Marlborough Buildings in this city, who was a great friend of Sir W. 

 Herschel, has often called on Mr. Smith to see the telescope, and repeatedly 

 declared to him that this was the same instrument by which the planet Uranus 

 had been discovered in 1781. It is supposed to have been made by Sir W. 

 Herschel, while organist in the Octagon Chapel, Bath. 



