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.

    119/280 (page 93)
    inches. (Vide Martyn’s Abridgment of the Parisian Memoirs.) At Kendal, in latitude 54° 17’ N. the mean range for 5 years was 2.13 inches; the greatest range was 2.65 inches. A comparison of the observations made at London, Kendal and Keswick likewise corroborates the same.—In Sweden and Russia, the range is still greater. 3. In the temperate zones the range and fluc- tuation of the barometer is always greater in winter than in summer. See the observations, particularly the tables, p. 15 and 16. 4. The rise and fall of the barometer are not local, or confined to a small district of country, but extend over a considerable part of the globe, a space of two or three thousand miles in circuit at least. See the general observation, page 15. In the French Philosophical Transactions for 1709, there is a comparison of observations upon the barometer made at Paris and Genoa, for 3 years; the distance of the places is at least 350 miles ; notwithstanding this, it was found to rise and fall almost universally on the same day at both places, only the variation was less at Genoa than at Paris, because its latitude is less; no differ- ence in time was perceived, whether the fluctuations were sudden or gradual, except in one instance, when the rise was one day later at Genoa than at Paris. The precise extent to which the fluctuations of the barometer reach, has not, that I know of, ever yet been ascertained in any one instance, for want of cotemporary observations made at a great number of distant places. 5. The barometrical range is greater in North America than in Lurope, in the same latitude. From the American Philosophical Transactions we find the range is as great in New England as in this country, though it is 10° nearer the equator. Also, at Williamsburgh in Virginia,