
THE BAROMETER AT THE LEVEL OF THE SEA. 239° 
The greatest observed difference is between Madeira and Godthaab, 339/”:2 
—333/"3 = 5/”9; the formula gives only 4’”-0. According to this table I have 
constructed a curve, which represents the variation of from equator to the pole ; 
but it is too voluminous for a letter. 
If the observations are correct, there is a discontinuity between the eastern 
and western coasts of the Northern Atlantic Ocean ; for instance, Christiania, 
Bosekop (Norway), compared with Reikiavik (Iceland), and Godthaab, Godhaven 
(Greenland) ; as also St Thomas (West Indies), compared with Santa Cruz, Tene- 
riffe, and Madeira. If the whole globe was only an ocean, there would certainly 
be no such irregularities. 
The Norwegian Government has, according to the demand of the Royal So- 
ciety in London, resolved, that magnetical and meteorological observations, which 
stopped at the end of June 1843, shall be continued herea year. They were again 
commenced the 15th August this year, and will be continued to the same date in 
1847. The unifilar is observed every tenth minute, mean time Gottingen; the bi- 
filar and meteorological phenomena, every full hour. I am, Sir, sincerely yours, 
CHRISTOPHER HANSTEEN. 
