Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 1 - By Alexander Von Humboldt And Aime Bonpland.
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The
Noise Seemed To Come From The Bottom Of The Well; A Very Curious
Phenomenon, Though Very Common In Most Of The Countries Of America
Which Are Exposed To Earthquakes.
A few minutes before the first shock there was a very violent blast
of wind, followed by electrical rain falling in great drops.
I
immediately tried the atmospherical electricity by the electrometer
of Volta. The small balls separated four lines; the electricity
often changed from positive to negative, as is the case during
storms, and, in the north of Europe, even sometimes in a fall of
snow. The sky remained cloudy, and the blast of wind was followed
by a dead calm, which lasted all night. The sunset presented a
picture of extraordinary magnificence. The thick veil of clouds was
rent asunder, as in shreds, quite near the horizon; the sun
appeared at 12 degrees of altitude on a sky of indigo-blue. Its
disk was enormously enlarged, distorted, and undulated toward the
edges. The clouds were gilded; and fascicles of divergent rays,
reflecting the most brilliant rainbow hues, extended over the
heavens. A great crowd of people assembled in the public square.
This celestial phenomenon, - the earthquake, - the thunder which
accompanied it, - the red vapour seen during so many days, all were
regarded as the effect of the eclipse.
About nine in the evening there was another shock, much slighter
than the former, but attended with a subterraneous noise. The
barometer was a little lower than usual; but the progress of the
horary variations or small atmospheric tides, was no way
interrupted. The mercury was precisely at the minimum of height at
the moment of the earthquake; it continued rising till eleven in
the evening, and sank again till half after four in the morning,
conformably to the law which regulates barometrical variations. In
the night between the 3rd and 4th of November the reddish vapour
was so thick that I could not distinguish the situation of the
moon, except by a beautiful halo of 20 degrees diameter.
Scarcely twenty-two months had elapsed since the town of Cumana had
been almost totally destroyed by an earthquake. The people regard
vapours which obscure the horizon, and the subsidence of wind
during the night, as infallible pregnostics of disaster. We had
frequent visits from persons who wished to know whether our
instruments indicated new shocks for the next day; and alarm was
great and general when, on the 5th of November, exactly at the same
hour as on the preceding day, there was a violent gust of wind,
attended by thunder, and a few drops of rain. No shock was felt.
The wind and storm returned during five or six days at the same
hour, almost at the same minute. The inhabitants of Cumana, and of
many other places between the tropics, have long since observed
that atmospherical changes, which are, to appearance, the most
accidental, succeed each other for whole weeks with astonishing
regularity. The same phenomenon occurs in summer, in the temperate
zone; nor has it escaped the perception of astronomers, who often
observe, in a serene sky, during three or four days successively,
clouds which have collected at the same part of the firmament, take
the same direction, and dissolve at the same height; sometimes
before, sometimes after the passage of a star over the meridian,
consequently within a few minutes of the same point of true time.*
(* M. Arago and I paid a great deal of attention to this phenomenon
during a long series of observations made in the year 1809 and
1810, at the Observatory of Paris, with the view of verifying the
declination of the stars.)
The earthquake of the 4th of November, the first I had felt, made
the greater impression on me, as it was accompanied with remarkable
meteorological variations.
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