1823.] Col. Beaufoy's Astronomical Observations. 



57 



Article VIII. 



Astronomical Observations, 1822. 

 By Col. Beaufoy, FRS. 



Bushei/ Heath, near Stanmore. 



Latitude 51° ST 44'3" North. Longitude West in time 1' 20-93". 



Nov. 21. Immersion of Jupiter's first J 16H 



satellite { 16 



Nov. 23. Immersion of Jupiter's first <j 10 



satellite ( 10 



Nov. 25. Emersion of Jupiter's first <j 7 



satellite ( 7 



Nov. 27. Emersion of Jupiter's second C 9 



satellite \ 9 



Nov. 29. Immersion of Jupiter's third 



satellite.* 



Dec. 7. Emersion of Jupiter's first C 16 



satellite ( 16 



Dec. 1 1 . Emersion of Jupiter's second C 1 5 



satellite ; 15 



Mean Time at Bushey. 

 Mean Time at Greenwich. 

 Mean Time at Bushey. 

 Mean Time at Greenwich. 

 Mean Time at Bushey. 

 Mean Time at Greenwich. 

 Mean Time at Bushey. 

 Mean Time at Greenwich. 



Mean Time at Bushey. 

 Mean Time at Greenwich. 

 Mean Time at Bushey. 

 Mean Time at Greenwich. 



Article IX. 



Analysis of Llranite from Cornwall. 

 By Richard Phillips, FRS. L. & E. &c. 



This mineral has been found in several of the Cornish mines ; 

 the crystals are sometimes of a yellow colour, more especially 

 those which occur in Tin Croft copper mine, near Redruth ; 

 while in Gunnis Lake copper mine, at the eastern extremity of 

 the county, it is met with of a beautiful deep-green colour. 



The primary crystal of this substance is a right square prism, 

 and there is no difference in this respect between the yellow and 

 green crystals; the modifications of this form, with their 

 varieties, have been described by my brother (Mr. W. Phil- 

 lips), in the third volume of the Geological Transactions. 



Both varieties of uranite have been subjected to chemical 

 examination by the late Rev. Mr. Gregor. With respect to the 

 yellow crystals, he states (Phil. Trans. 1805),' that beside oxide 

 of uranium, they contain some lime, silica, and oxide of lead ; 

 and, he observes, that " the green crystals differ in no respect 



* According to the Nautical Almanac, the immersion of this satellite should have 

 taken place at 17* 26' 53"; but although I placed the telescope at I7h 09' 29", the 

 eclipse had previously occurred. 



