Scientific American Supplement, No. 388, June 9, 1883Various
Science
Scientific American Supplement, No. 388, June 9, 1883
Various
Science -- Periodicals
Eleven eruptions occurred during the night, and shot into the air
fiery scoriae which, in a short time, formed three hillocks from forty
to fifty meters in height. The jet of scoriae was accompanied with
strong detonations, and the oscillations of the ground were of such
violence that the bells in the villages of Nicolosi and Pedara rang of
themselves. The general consternation was the greater in that the
locality in which the eruptive phenomena were manifesting themselves
was nearly the same as that which formed the theater of the celebrated
eruption of 1669. This locality overlooks an inclined plane which is
given up to cultivation, and in which are scattered, at a short
distance from the place of the eruption, twelve villages having a
total population of 20,000 inhabitants. On the second day the
character, of the eruption had become of a very alarming character.
New fissures showed themselves up to the vicinity of Nicolosi, and the
lava flowed in great waves over the circumjacent lands. This seemed to
indicate a lengthy eruption; but, to the surprise of those interested
in volcanic phenomena, on the third day the eruptive movement began to
decrease, and, during the night, stopped entirely. This was a very
fortunate circumstance, for this eruption would have caused immense
damages. It cannot be disguised, however, that the eruptive attendants
of this conflagration remain under conditions such as to constitute a
permanent danger for the neighboring villages. It has happened, in
fact, that in consequence of the quick cessation of the eruption,
those secondary phenomena through which nature usually provides a
solid closing of the parasitic craters have not occurred. So it is
probable that when a new eruption takes place it will be at the same
point at which manifested itself the one that has just abated.--_La
Nature_.
* * * * *
PHYSICS WITHOUT APPARATUS.
Take an ordinary wine bottle and place it in front of and within a few
inches of a lighted candle. Blow against the bottle with your mouth at
about four or six inches distant from it and in a line with the flame.
Very curiously, notwithstanding the presence of the bottle and its
interception of the current of air, the candle will be immediately
extinguished as if there were no obstacle in the way. This phenomenon
is readily understood when we reflect that the bottle receives the
current of air on its polished surface and divides it into two, one of
which is guided to the right and the other to the left. These two
currents, after separating and driving back the surrounding air, meet
again at the very spot at which the flame is situated, and extinguish
the candle.
[Illustration: MODE OF EXTINGUISHING A CANDLE PLACED BEHIND A
BOTTLE.]
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