The Hurricane Guide: Being an Attempt to Connect the Rotatory Gale Or Revolving Storm with Atmospheric WavesJohn Murray, 1850 - 60 pages |
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Common terms and phrases
50th meridian Accumulations of Pressure ascertain atmospheric waves Axis line baro barometer falling barometer rising board vessels Cape Horn capillary action Caribbean Sea centre character cistern classes of phænomena commencement connexion correction course currents depression desiderata direction equator especial reference force gale half of storm hourly observations hourly readings HURRICANE MOVING important inch indicate instruments intervals of three James Clark Ross land and water last half latitude LEFT-HAND SEMICIRCLE line of country localities margin marked maxima and minima maximum means mercurial column meteorological N.W. wind neighbourhood neutral point Northern Atlantic northern hemisphere oceanic surface oscillation parallel particular attention portable barometer portion preceding present revolving storms RIGHT-HAND SEMICIRCLE rotation rotatory storms sailing series of observations ship six-hourly Southern Oceans storm increasing storm passing storm paths Straits of Gibraltar succeeding three hours three-hourly observations three-hourly series tions tube undulations veering vessels navigating voyage western Wind E.N.E. Wind W.S.W. zero
Popular passages
Page 22 - WIND 0 Calm. 1 Light Air 2 Light Breeze 3 Gentle Breeze 4 Moderate Breeze 5 Fresh Breeze 6 Strong Breeze — 7 Moderate Gale 8 Fresh Gale 9 Strong Gale 10 Whole Gale...
Page 24 - ... have barometers the capillary action of which has not been determined, a table of corrections for tubes of different diameters is placed in the Appendix, Table I. The next correction, and in some respects the most important of all, is that due to the temperature of the mercury in the barometer-tube at the time of observation, and to the expansion of the scale. Table II. of the Appendix gives for every degree of the thermometer and every halfinch of the barometer, the proper quantity to be added...
Page 48 - ... phenomena. At each station the observations must be continued one year, from September i to August 31. The meteorological observations will be made in conformity with the resolutions of the permanent International Committee, and will relate to atmospheric pressure, the temperature and humidity of the air, the direction and force of the wind, the state of the sky and its degree of clearness, and also to phenomena of condensation. The programme then gives detailed instructions as to methods and...
Page 24 - ... subtracted from it. In barometers furnished with a fiducial point for adjusting the lower level, this correction is superfluous, and must not be applied. The second correction required is for the capillary action of the tube, the effect of which is always to depress the mercury in the tube by a certain quantity inversely proportioned to the diameter of the tube. This quantity should be experimentally determined during the construction of the instrument, and its amount marked upon it by the maker,...
Page 22 - Triple-reefed topsails, &c. Close-reefed topsails, and courses. 10 Whole Gale Or that with which she could scarcely bear close-reefed main topsail and reefed foresail.
Page 26 - ... hour's quiet exposure, side by side, that they may have the same temperature. If compared by two observers, each should read off his own barometer in his usual manner, then each should verify the other's result. By this means the zero of one standard may be transported over all the world, and that of others compared with it ascertained. To do so, however, with perfect effect requires the utmost care in the transport of the intermediate barometer, and is by no means an operation either of trifling...
Page 50 - This depression is generally succeeded by two well•marked undulations, varying from one to two days in duration. The central undulation, which also forms the apex of the great wave, is of larger extent, occupying from three to five days ; when this has passed, two smaller undulations corresponding to those at the commencement of the wave make their appearance, and at the close of the last the wave terminates.
Page 31 - March, the 21st of June, the 21st of September, and the 21st of December, being those, or immediately adjoining to those, of the equinoxes and solstices, in which the solar influence is either stationary, or in a state of most rapid variation. But should...
Page 37 - Report of the Committee of Physics and Meteorology, appointed by the Royal Society in 1840, as follows: — "The barometer, at the level of the sea, does not indicate a mean atmospheric pressure of equal amount in all parts of the earth ; but, on the contrary, the equatorial pressure is uniformly less in its mean amount than at and beyond the tropics.
Page 15 - ... arrives at that line, when the maximum is attained. The wind now changes and the barometer immediately begins to fall, and continues to fall until the edge aa coincides with the line of country on which bb first impinged. During this process we have all the phenomena exhibited by an atmospheric wave ; when the edge bb, fig.