Papers on meteorology : relating especially to the climate of Britain, and to the variations of the barometer / by Luke Howard.

  • Howard, Luke, 1772-1864.
Date:
1850-1854
Catalogue details

Licence: Public Domain Mark

Credit: Papers on meteorology : relating especially to the climate of Britain, and to the variations of the barometer / by Luke Howard. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    decline of gravity to the moon’s south place, is replaced by one in which the loss of gravity by the north declination continues into the following week, and is restored (very nearly) in the fourth week; the moon yet full south. There must be some- thing then, the author concludes, in the more northerly latitude, affecting partially the mixed average 1824 to 1832, and more completely the northern average 1833 to 1841. Having in his former paper exhibited a set of averages upon the rohole solar year, from 1815 to 1832, in which the yearly mean pressure increases to the middle of a cycle of eighteen years, and then decreases with great regularity to its former amount, he inserts in the present paper a similar calculation, but with an opposite result: which shows the pressure decreasing from year to year, and then recovering in some measure its former level. He proceeds to consider, in conclusion, the nature of this contrast, pointing again to the difference of latitude as its possible cause. § III. A CYCLE OF EIGHTEEN YEAKS IN THE SEASONS OF BRITAIN; DE- DUCED FROM METEOROLOGICAL OBSERVATIONS MADE AT ACKWORTH, IN THE WEST RIDING OF YORKSHIRE, FROM 1824 TO 1841; COMPARED WITH OTHERS BEFORE MADE FOR A LIKE PERIOD (ENDING WITH 1823) IN THE VICINITY OF LONDON. [This Section is a reprint, with corrections and additions, of the author’s work bearing the same title, published at London, Leeds and Pontefract at the end of April 1842, in octavo. The Dedication, to the Earl Pitzwilliam, is dated “ Tottenham, March 31, 1842.” After the publication of this work, the author communicated a paper on the same subject to the Section of Mathematics and Physics of the British Association for the Advancement of Science, at its Twelfth Meeting, held at Manchester in June 1842. An abstract of this paper appeared in the Report for that year, in the Transactions of the Sections, p. 24, under the title of “ On a Cycle of Eighteen Years in Atmospherical Phenomena; ” accompanied by a Chart, showing the mean temperature, proportionate occurrence of the four classes of winds, and depth of rain, for each year of the cycle from 1824 to 1841.] The fact of a periodical revolution, bringing alternate warmth and coldness through successive trains of seasons in our variable climate, is now ascertained beyond con- troversy ; and it becomes in consequence an important object, to ascertain the nature