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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    an arch in the north-west quarter, from which proceeded several beams; they converged to a point on the magnetic meridian, about 18° beyond the zenith. October 31.—At Kendal. A few beams were seen to run to and fro from E. to W. low, or near the horizon: the moon shone bright at the time, and the clouds coming on soon after, the whole was obscured. November 19.—At Kendal, the particulars of the observation were mislaid; at Keswick, the aurora rose to about 18° above the horizon, and was situate in the usual quarter. December 7.—At Keswick, a faint appearance ; about 5° high. 1793. January 11.—At Kendal, a small arch in the horizon ; it rose to 5 or 10° altitude, and was bisected by the magnetic meridian. January 12.—At Kendal, from 6 to 9 P. M. a horizontal lu- minous arch, 20° altitude, and bisected by the magnetic meridian. After 9, fine streamers struck out, and ran to and fro a while across the said meridian, and then were converted into flashes, as usual; some rose up to the zenith. The point of convergency, and every other particular, were, to all appearances, the same as have been described before. The needle was considerably agitated at the time. January 138.—At Kendal, very bright in the northern horizon, but clouded above.—The variation of the needle at 6 P., M. 25° W.; at 9 P. M. 24° 384’; at 10 P. M. 24° 54’; next morning 25° 4’. February 8.—At Kendal, bright northward at 83 P. M.: at 10, the luminous arch was 16° altitude.—The other circumstances relating to it follow, supposing the variation of the needle at the noon of that day 25° W. Variation of H. M. the needle. 10 OP. M. 25° O’W. the arch rising. 10 10 —— 24 54 — bright streamers, low, with clouds. 10 30 —— 24 42 — streamers risen; fine, westward.* * That is, relative to the magnetic meridian, here and elsewhere.