182 Scientific Intelligence. 



Breadth of the outer ring - - - - 2".43 



— ■ space between . - _ o .407 



— — inner ring - - - 3 .903 



Distance of the ring from Saturn - - - 4 .339 



Equatorial radius of Saturn - - - - 8 .995 



The inclination of the ring to the plane of the ecliptic is 28° 5' 54" 

 App. to Mr Bailee's Astronomical Tables, p. 272. 



3. Professor Struves new measurements of Jupiter and his Satellites. 



4. Encke's Comet. — This comet, which was first re-discovered in Great 

 Britain on the 26th October, by Mr Dunlop, at Sir Thomas Brisbane's Ob- 

 servatory at Makerston, in Roxburghshire, was observed by Mr South on 

 the 30th October, in R. Asc. 23^ 13' and N. Decl. 25° 43'. On the 4th No- 

 vember, it was in R. Asc. 22'* 49' and N. Decl. 23° 48'. On the 4th No- 

 vember, it was seen at Greenwich Observatory by Mr Richardson, and on 

 the 5th at Slough by Mr Herschel. 



5. On the Constant of the Aberration of Light. — Mr.Richardson of Green- 

 wich Observatory has found the constant of aberration to be 20" 505, by 

 Troughton's Circle, and 20" 502 by Jones's Circle, from 4119 observations 

 made during the years 1825, 6, 7, and 8. 



OPTICS. * 



6. I^arge Polyzonal Burning Lens, — Our optical readers may remember, 

 that we formerly proposed that a large burning lens built up of zones and 

 segments should be constructed by the joint aid of public societies, or by 

 individual subscriptions. This idea is now likely to be realised. Through 

 the scientific zeal of George Swinton, Esq. and James Calder, Esq. and se- 

 veral other ardent friends of science at Calcutta, we have received nearly 

 L. 150 towards defraying the expence of constructing such a lens. This 

 sum alone is sufficient for executing a larger lens than any that has yet 

 been made ; so that there is now every probability that a splendid burning 

 instrument will speedily be constructed in this country. This will be ef- 

 fected by a scientific committee, and by arrangements which will be fully 

 described in our next Number. 



MAGNETISM. 



7. Professor Hansteens Magnetic Journey. — Letters have been re- 

 ceived from Professor Hansteen and his companions to the 18th February, 

 —On the 12th of September the left Tobolsk and travelled on sledges. 



