6 degrees, I have found the regularity of the ebb and flow of the aerial
ocean undisturbed by storms, hurricanes, rain, and earthquakes. The amount
of the daily oscillations diminishes from 1.32 to 0.18 French lines from the
equator to 70 degrees north latitude, where Bravais made very accurate
observations at Bosekop.*
[footnote] *Bravais, in Daemtz and Martins, 'Meteorologie', p. 263. At
Halle (51 degrees 29' N. lat.), the oscillation still amounts to 0.28 lines.
It would seem that a great many observations will be required in order to
obtain results that can be trusted in regard to the hours of the maximum and
minimum on mountains in the temperate zone. See the observations of horary
variations, collected on the Faulhorn in 1832, 1841, and 1842 (Martins,
'Meteorologie', p. 254.)
The supposition that, much nearer the pole, the height of the barometer is
really less at 10 A.M. than at 4 P.M., and consequently, that the maximum
and minimum influences of these hours
p 315
are inverted, is not confirmed by Parry's observations at Port Bowen (73
degrees 14').
The mean height of the barometer is somewhat less under the equator and in
the tropics, owing to the effect of the rising current,* than in the
temperate zones, and it appears to attain its maximum in Western Europe
between the parallels of 40 degrees and 45 degrees.
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