This Latter Case Is Remarkable, As The Electric
Fluid Must Have Turned Back At The Acute Angle Of 26 Degs.,
To The Line Of Its Main Course.
Besides the four tubes which
I found vertical, and traced beneath the surface, there were
several other groups of fragments, the original sites of which
without doubt were near.
All occurred in a level area of
shifting sand, sixty yards by twenty, situated among some
high sand-hillocks, and at the distance of about half a mile
from a chain of hills four or five hundred feet in height. The
most remarkable circumstance, as it appears to me, in this
case as well as in that of Drigg, and in one described by
M. Ribbentrop in Germany, is the number of tubes found
within such limited spaces. At Drigg, within an area of
fifteen yards, three were observed, and the same number
occurred in Germany. In the case which I have described,
certainly more than four existed within the space of the
sixty by twenty yards. As it does not appear probable that
the tubes are produced by successive distinct shocks, we must
believe that the lightning, shortly before entering the ground,
divides itself into separate branches.
The neighbourhood of the Rio Plata seems peculiarly subject
to electric phenomena. In the year 1793, [12] one of the
most destructive thunderstorms perhaps on record happened
at Buenos Ayres: thirty-seven places within the city were
struck by lightning, and nineteen people killed. From facts
stated in several books of travels, I am inclined to suspect
that thunderstorms are very common near the mouths of
great rivers. Is it not possible that the mixture of large
bodies of fresh and salt water may disturb the electrical
equilibrium? Even during our occasional visits to this part
of South America, we heard of a ship, two churches, and a
house having been struck. Both the church and the house
I saw shortly afterwards: the house belonged to Mr. Hood,
the consul-general at Monte Video. Some of the effects were
curious: the paper, for nearly a foot on each side of the line
where the bell-wires had run, was blackened. The metal had
been fused, and although the room was about fifteen feet
high, the globules, dropping on the chairs and furniture, had
drilled in them a chain of minute holes. A part of the wall
was shattered, as if by gunpowder, and the fragments had
been blown off with force sufficient to dent the wall on the
opposite side of the room. The frame of a looking-glass was
blackened, and the gilding must have been volatilized, for a
smelling-bottle, which stood on the chimney-piece, was coated
with bright metallic particles, which adhered as firmly as
if they had been enamelled.
[1] Hearne's Journey, p. 383.
[2] Maclaren, art. "America," Encyclop. Brittann.
[3] Azara says, "Je crois que la quantite annuelle des pluies
est, dans toutes ces contrees, plus considerable qu'en Espagne."
- Vol.
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