M. Daiiioiseau on the Remarkable Comet, ^c. 77 



At Offak, on the north coast of Waigiou, in long. 126"* 0' 

 50" E. and lat. 0° 1' 59" S. the definitive variation was 1° 1' 

 44% and the mean dip — 13° 41'.6 in September 1823. 



At Cayeli, on Bouzu, one of the Molucca Isles, in long. 

 Jggo 2V 41" E. and lat. 3° 21^ 8" S. the variation was 0° SV 

 48" N. E. and the dip — 20° 8' 4''. 



At Amboyna, one of the Molucca Isles, in October 1823, 

 [^ and in long. 123° 25^ 43" E. and lat. 3° 41' 41" S. the varia- 

 tion was 0° 28^ S" N. E. and the mean dip — 20° 32^3. 



During the passage from Amboyna to Port Jackson, the 

 following observations were taken. 



At Fort Macquarie, in Sydney, New South Wales, in lat. 

 33° 51' 41", the variation was 8° 55' 5T N. E., and the mean 

 inclination— 62° 17''.4. The variation obtained by Sir Thomas 

 Brisbane's needle was 9° 8' 8" N. E. and the mean of the two 

 9*^ 2' 2".5. 



M. Duperrey made the following observations on the mag- 

 netic intensity with a needle five decimetres long. 



In September 1823, at Ofikk, on the north side of Waigiou, 

 under the equator, the needle performed ten oscillations in 

 189".52oftime. 



At Port Jackson in January 1824, ten oscillations were 

 performed in 165". 443. 



The same needle observed in March 1823, at Bayta, on 

 the coast of Peru ; and at a small distance from the equator, 

 gave the same results as at Offak. 



Art. XV. — On the Remarkable Comet which revolves within 

 the Orbit of Jupiter, * By M. Damoiseau. 



On the evening of the 27th February 1826, M. Biela, resid- 

 ing at Josephstadt in Bohemia, observed in Aries a small 



• M. Daraoiseau's Memoir was read before the Academy of Sciences on 

 the 9th April 1827. The above abstract is from Le Globe, Avril U, 

 1827. 



