Meteorological observations and essays / By John Dalton.

  • John Dalton
Date:
1834
Catalogue details

Licence: Public Domain Mark

Credit: Meteorological observations and essays / By John Dalton. Source: Wellcome Collection.

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    be attended to; for, though many may be found afterwards to be trivial, and of little or no moment in leading us towards the dis- covery, yet some one or other of them generally happens to be of importance. It will be seen hereafter, that the exact bearing and extent of the large, still, horizontal arch of the aurora, and the point in the heavens to which the coruscations tend, are amongst the circumstances of much importance in the investigation of its cause. These circumstances, it must be confessed, were not accurately noticed, either at Kendal or Keswick, previous to the middle of October, 1792. As for myself, the only minute | usually made upon the still aurora was, that it was situate in the NW. by which I meant that its centre was between the N. and the W. without once attempting to ascertain the exact bearing of the centre; and the corona, when there was one, is often mentioned in my notes, as being south of the zenith, but the number of degrees was not ascertained. Mr. CrostuwatrTe, however, has been rather more particular, at times, with respect to the bearings, extent, &c. The centre of that on January 10th, 1788, he observes bore NNW.; that of the 28th of April, NW. b N.; the centres of all the rest are said to have been between the North and West, or else North; not one was observed to have its centre to the East of the meridian. N. B. The additional observations on the Aurore, beginning with that on the 13th of October, 1792, will be given after the next Section. :