The progress of the development of the law of storms, and of the variable winds, with the practical application of the subject to navigation. / by Lieut-Colonel William Reid.

  • Reid, William, 1791-1858.
Date:
1849
Catalogue details

Licence: Public Domain Mark

Credit: The progress of the development of the law of storms, and of the variable winds, with the practical application of the subject to navigation. / by Lieut-Colonel William Reid. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    On the annexed Chart will be found engraved, chap. two Tropical storms, one on each side of the Equator, L which exhibit in a more complete manner the coun- ter-movement of storms in the northern and southern hemisphere, since these two hurricanes have been traced over nearly 40 degrees of longitude. That one north of the Equator, was traced by Mr. Piddington, and the other by Mr. Thom, which he calls the Rodriguez Storm. Some description will be given of these storms in a subsequent chapter. The mode of recording the wind’s force, by a scale of numbers, and denoting the state of the weather, by letters of the alphabet, as practised at the Royal Observatory, at Greenwich, and now adopted by the Royal Navy, is found of great use in the study of the winds. This scale of numbers and the symbols denoting the state of the weather will be given below. It is much to be desired that they should be generally used throughout the commercial marine, as well as in observations on shore. Figures to denote the Force of the Wind. 7 8 yy yy yy yy yy yy yy Light Air . . just sufficient to give.. Steerage-way. T io-ht Urppyp r with which a well-con-| 1 to 2 knots, j ditioned man-of-war. I 0denotes Calm. 1 2 3 4 5 6 Gentle Breezed Modere Breeze Fresh Breeze Strong Breeze L ditioned man-of-war, | under all sail, and )>3 to 4 knots, clean full, would go in | smooth water, from J 5 to 6 knots. in which the same ship ModerateGale y could just carry closed Fresh Gale . hituled 9 „ Strong Gale.. Royals, &c. Single-reefs and top- gallant sails. Double-reefs, jib, &c. Triple-reefs, courses, &c. Close-reefs & courses.