The Progress of the Development of the Law of Storms, and of the Variable Winds: With the Practical Application of the Subject to Navigation; Illustrated by Charts and Wood-cuts

الغلاف الأمامي
J. Weale, 1849 - 424 من الصفحات
 

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الصفحة 366 - Soon after midnight, our ships were involved in an ocean of rolling fragments of ice, hard as floating rocks of granite, which were dashed against them by the waves with so much violence that their masts quivered as if they would fall at every successive blow; and the destruction of the ships seemed inevitable from the tremendous shocks they received.
الصفحة 8 - that a whirlwind which sets an extended portion of the atmosphere, into a state of rapid revolution, diminishes the pressure of the atmosphere over that .portion of the earth's surface, and most of all at the centre of the whirl. The depth of the compressing column of air will, at the centre, be least, and its weight will be diminished in proportion to the violence of the wind.
الصفحة 172 - ... south, and moderated a little. It continued to blow hard from that quarter until noon of the 6th, when it moderated fast, and we began bending other sails in room of those that were split. When the gale commenced, which we consider it did at 1 PM on the 5th, we were about twenty miles east of the Lema ; where we were when it ended it is hard to say, as we saw nothing till the morning of the 7th, when we made Mondego Island.
الصفحة 79 - ... at the centre of the vortex, though heaped up towards the verge of the storm. But it may be possible, that a wave of a round or oval form, moving onward like a tidal wave, but at the rate of the storm's progress, may accompany the storm in its course, and that its height may depend on the degree of atmospheric pressure, modified by the revolving power of the wind. The impulse in the direction of the storm's course being given, and maintained for a few hundred miles, currents, very similar to...
الصفحة 356 - It is then unsafe to be near the land— as the gale that commences at NNE, invariably veers to the westward, making a lee shore of the whole line of coast, and between WNW and WSW blows the hardest. Fortunately these gales give ample warning; the barometer always foretells their approach, and generally begins to fall three or four days before the commencement of the gale — besides which, there are other never-failing indications of a northerly wind, such as, the change of the current, which, (owing...
الصفحة 6 - Ugly threatening appearance in thn weather. v Visibility of Distant Objects — whether the sky be cloudy or not. w Wet Dew. . Under any letter denotes an Extraordinary Degree. By the combination of these letters all the ordinary phe, nomena of the weather may be recorded with certainty and brevity.
الصفحة 360 - April the 29th,(the firstd ay of the fresh north-easterly winds), and May the 3rd, (when the gale was at its height, and the wind began to draw to the southward of west) the mercury had fallen 6-tenths. The change of current did not precede the wind, but changed with it ; when the gale was strong from NW and WNW the current ran a knot an hour to the SE, and when the wind changed to SW it ran with the same velocity to the NE The west coast of New Holland is at times visited by sudden squalls, resembling...
الصفحة 13 - ... masts and yards alone will produce this effect, should the wind veer ahead, and it is supposed that vessels have often foundered from this cause. ' When the wind veers aft as it is called, or by the stern, this danger is avoided, and a ship then...
الصفحة 13 - ... storm's course, as we look in the direction in which it is moving, just as we speak of the right bank of a river. The rule for laying a ship to, will be, when in the right hand semicircle, to heave to on the starboard tucfc, and when in the left-hand semicircle, on the port tack in both hemispheres.

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