NORTHERN HEMISPHERE. Axis line, wind N.E., barometer falling, first half of storm. Axis line, wind S.W., barometer rising, last half of storm. RIGHT-HAND SEMICIRCLE. Wind E.N.E., E., E.S.E., S.E., barometer falling, storm increasing.
In sketching out a system of observation having especial reference to atmospheric waves and rotatory storms, regard has been had--_first_, to the instruments that should be used, the observations to be made with them, the corrections to be applied
TABLE I.--Correction to be added to Barometers for Capillary Action. +--------------------+---------------------------------+ Correction for Diameter of Tube. -----------------+---------------
Figures 1 and 2, enlarged and printed on narrow rings of stiff cardboard, are employed for this purpose. The letters outside the thick circle are intended to distinguish the points of the compass, and in use should always coincide with those point
In sketching out a system of barometric observation having especial reference to the acquisition of data from which the _barometric character_ of certain large areas of the surface of the globe may be determined--inasmuch as such areas are distingui
NORTHERN HEMISPHERE. Axis line, wind N.E., barometer falling, first half of storm. Axis line, wind S.W., barometer rising, last half of storm. RIGHT-HAND SEMICIRCLE. Wind E.N.E., E., E.S.E., S.E., barometer falling, storm increasing.
In sketching out a system of observation having especial reference to atmospheric waves and rotatory storms, regard has been had--_first_, to the instruments that should be used, the observations to be made with them, the corrections to be applied
When the Wind turns to North East, and it continues two Days without Rain, and does not turn South the third Day, nor Rain the third Day, it is likely to continue North East for eight or nine Days, all fair; and then to come to the South again. I
In Summer or Harvest, when the Wind has been South two or three Days, and it grows very hot, and you see Clouds rise with great white Tops like Towers, as if one were upon the Top of another, and joined together with
IN the old Almanacks we have this Sign of the Weather thus expressed. When Clouds appear like Rocks and Towers, The Earth's refresh'd by frequent Showers. THE Reason of this seems to be, that the watery Vapours are then condensed, or co
THIS is differently expressed by other Authors. My Lord Bacon tells us, that if Clouds appear white, and drive to the N. W. it is a Sign of several Days fair Weather. OUR old English Almanacks have a Maxim to this Purpose. If woolly Fleeces
Fair Weather for a Week, with a Southern Wind, is like to produce a great Drought, if there has been much Rain out of the South before. The Wind usually turns from North to South, with a quiet Wind without Rain, but returns to the North, with a stro
Although the preceding remarks are probably sufficient for their principal purpose--these pages may fall into the hands of persons familiar with the subject, to whom the following observations may be addressed, as some of the reasons for what has be
The daily movement of the barometer may be noted (in a form or table of double entry) at the time of each observation, by a dot at the place corresponding to its altitude, and the time of observing; which dot should be connected with the previous on
Familiar as the practical use of weather-glasses is, at sea as well as on land, only those who have long watched their indications, and compared them carefully, are really able to conclude more than that the rising glass USUALLY foretells less win
In this part of the world, towards the higher latitudes, the quicksilver ranges, or rises and falls, nearly three inches--namely, between about thirty inches and nine-tenths (30.9), and less than twenty-eight inches (28.0) on extraordinary occasions
On the recommendation of the Kew Observatory Committee of the British Association for the Advancement of Science. This instrument should be suspended in a good light for reading, but out of the reach of sunshine or the heat of a fire or lamp. It
Either the prolonged effect of the atmospheric pressure upon the thin glass of the bulbs of thermometers, or the gradual restoration of the equilibrium of the particles of the glass after having been greatly disturbed by the operation of boiling the
Subsequently the aneroid has been further reduced in size and it can now be had from an inch and a quarter to six inches in diameter. The smallest size can be enclosed in watch cases, fig. 35, or otherwise, so as to be adapted to the pocket. By a be
In order that the instrument may be portable, it must be made a fixture and mounted on a support; and, further, to render it scientifically or even practically useful, many precautions are required in its construction. The following remarks apply to
A form of rain-gauge, very well adapted for expeditious observation at any time, has been designed by Admiral FitzRoy, and extensively employed by his observers. It is cylindrical in shape, with the funnel let into the top; and the rainfall is coll
The directions given on the scales of these barometers were drawn up by Admiral FitzRoy, F.R.S. They appear to be founded on the following considerations:— Supposing a compass diagram, with the principal points laid down, the N.E. is the w