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.

    64/280 (page 38)
    SECTION FIFTH. Observations on the height of the Clouds. Mr. Crostuwaite, of Keswick, has availed himself of his situation in the vicinity of high mountains, to make observations on the height of the clouds ; for which purpose he has chosen Siddaw, the highest mountain in the neighbourhood, a very fine view of which his museum commands. By means of marks on the side of the mountain, and with the assistance of a telescope, he can discern, to a few yards, the height of the clouds, when they are below the summit, which is very often the case.—Perhaps the following series of observations is the only one of the kind extant, as the labour and difficulty attending such observations in a champaign, or flat country, are sufficient to deter any one from making two or three daily observa- tions for a series of years; and when the whole sky is clouded, they are quite impracticable. He has determined, by trigonometry, the per- pendicular height of Skiddaw, above the level of Derwent lake, to be 1050 yards, which agrees very nearly with Mr. Donatp’s observations; and he has noted, in a column of his meteorological journal, every morning, noon, and evening, the height of the clouds, in yards, above the level of the said