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ANNUAL BAROMETRIC VARIATIONS.
221
siderably, and thus, counterbalancing the normal effect of dry air, gives to
the barometric curve a maximum of summer which corresponds to the diurnal rise of ten o'clock in the morning, or else complicates the series of
monthly variations by very numerous irregularities. Each one of these
inflections corresponds to some important phenomenon in local climate,
cold or heat, storms or tranquillity of the air, dryness, or a great quantity of watery vapor. In general, it is at the epoch of the equinoxes, when
the temperature is nearly equal to the annual mean, that the mean barometric pressure of the year is established.
30.515m4
(50.119 y
260
(29.922 ms)
255
(29.72510*)
250
(29.528nuO
24,5
(29.S51ms)
(29J34ins)I>
Fig. 101.—Monthly Variations in the Pressure of the Atmosphere at Cairo, Calcutta, Berlin,
St. Petersburg, Benares, Paris, and Halle.
As to the irregular variations, they are also accomplished according to
a certain rhythm in various regions of the globe. At the* equator they
are almost nothing, but in proportion as we approach either of the poles
the irregularities become more marked, and the leaps produced in the column of mercury by sudden changes of temperature, and by the alternations of winds and storms, succeed each other more frequently. In tropical regions these differences of barometric height are hardly a few fractions of an inch, while in the temperate latitudes they have exceeded 2*1
inches at Milan for a period of eighty-one years, and 2*6 inches at St. Petersburg for a period of nineteen years. In order to obtain figures more
comparable with each other, Kiimtz has calculated the monthly amount
of the oscillations of the barometer for every station, and*in this way has
been able to draw up the following table:
| Title | The ocean, atmosphere, and life |
| Creator | Reclus, Elisée |
| Publisher | Harper |
| Place of Publication | New York |
| Date | 1873 |
| Language | eng |
| Type | Books/Pamphlets |
| Title | 00000244 |
| Type | Books/Pamphlets |
| Transcript | ANNUAL BAROMETRIC VARIATIONS. 221 siderably, and thus, counterbalancing the normal effect of dry air, gives to the barometric curve a maximum of summer which corresponds to the diurnal rise of ten o'clock in the morning, or else complicates the series of monthly variations by very numerous irregularities. Each one of these inflections corresponds to some important phenomenon in local climate, cold or heat, storms or tranquillity of the air, dryness, or a great quantity of watery vapor. In general, it is at the epoch of the equinoxes, when the temperature is nearly equal to the annual mean, that the mean barometric pressure of the year is established. 30.515m4 (50.119 y 260 (29.922 ms) 255 (29.72510*) 250 (29.528nuO 24,5 (29.S51ms) (29J34ins)I> Fig. 101.—Monthly Variations in the Pressure of the Atmosphere at Cairo, Calcutta, Berlin, St. Petersburg, Benares, Paris, and Halle. As to the irregular variations, they are also accomplished according to a certain rhythm in various regions of the globe. At the* equator they are almost nothing, but in proportion as we approach either of the poles the irregularities become more marked, and the leaps produced in the column of mercury by sudden changes of temperature, and by the alternations of winds and storms, succeed each other more frequently. In tropical regions these differences of barometric height are hardly a few fractions of an inch, while in the temperate latitudes they have exceeded 2*1 inches at Milan for a period of eighty-one years, and 2*6 inches at St. Petersburg for a period of nineteen years. In order to obtain figures more comparable with each other, Kiimtz has calculated the monthly amount of the oscillations of the barometer for every station, and*in this way has been able to draw up the following table: |
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