On three several hurricanes of the Atlantic, and their relations to the northers of Mexico and Central America, with notices of other storms . everal academies in the state of New York, and various profes-sors and other gentlemen have furnished me with copies of theirprivate journals. I am indebted, also, to many merchants, ship-masters, and others, for important aid, and can only hope that theresults attained may prove useful to those who may be engagedin commercial and other pursuits. Practical Deductions.—It was my purpose to add some furtherpractical exposition of the law of rotation and p
On three several hurricanes of the Atlantic, and their relations to the northers of Mexico and Central America, with notices of other storms . everal academies in the state of New York, and various profes-sors and other gentlemen have furnished me with copies of theirprivate journals. I am indebted, also, to many merchants, ship-masters, and others, for important aid, and can only hope that theresults attained may prove useful to those who may be engagedin commercial and other pursuits. Practical Deductions.—It was my purpose to add some furtherpractical exposition of the law of rotation and progression instorms, which might aid the mariner in avoiding their destruc-tive violence, and render the rotary winds and gales more sub-servient to navigation ; but my proposed limits have already beenexceeded. It is necessary, however, that the character and gen-eral extent of the rotation, and the usual courses of progression,be once clearly understood. Perhaps no one case can better il-lustrate these conditions than the Cuba hurricane, viewed in its ??iinit/iit . i,r >;!? .111,1 7,/„i, v-v «\^ \ ? .1 %V l- ? w. Choice of Courses and Tack, in a Gale. 115 successive positions and local changes of wind, as shown inCharts IV to X, and compared, also, with the varying courses ofprogression which are shown in Chart I. Let the mariner sup-pose himself in any position which may fall under the approach-ing gale as there delineated, and he may perceive the successivechanges of wind which must necessarily take place, as the galepasses onward. This gale, in its various local phases, may betaken as illustrating pretty fairly, nearly all the great storms inthe northern temperate latitudes, as well as the successive localchanges of a large portion of the common winds of these lat-itudes. The chief difficulty, in some latitudes, may be in determiningthe actual course of the gales progression; for the choice of anycourse for avoiding the heart of the gale must depend partly ont
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