Scientific American Supplement, No. 520, December 19, 1885Various
Science
Scientific American Supplement, No. 520, December 19, 1885
Various
Science -- Periodicals
Dr. Grangier, surgeon in the French army, writes from Algeria: "A few
days after the occupation of Brizerte, when the military authorities had
forbidden, under the severest penalties, the discharge of firearms within
the town, the whole garrison was awakened at three o'clock one morning by
the tremendous explosion of a heavily loaded gun in the neighborhood of
the ramparts; a guard of soldiers rushed into the house from whence the
sound had come, and found a woman lying on the floor with a newly born
babe between her thighs. The father of the child stood over his wife with
the smoking musket still in his hand, but his intentions in firing the
gun had been wholly medical, and not hostile to the French troops. The
husband discovered that his wife had been in labor for thirty-six hours.
Labor was slow and the contractions weak and far apart. He had thought it
advisable to provoke speedy contraction, and, following the Algerian
custom to _scare the baby_ out, he had fired the musket near his wife's
ear; instantanously the accouchement was terminated. After being
imprisoned twenty-four hours, the Arab was released."--_Cincinnati
Lancet._
* * * * *
"ELASTIC LIMIT" IN METAL.
The _Engineering and Mining Journal_ raises the question whether steel,
which is becoming so popular a substitute for wrought iron, will, when it
is subjected to continuous strain in suspension bridges and other similar
structures, do as well as iron has proved that it can. Recent tests of
sections from the cables at Fairmount Park, Philadelphia, and at Niagara
Falls show that long use has not materially changed the structure. The
_Journal_ says: "It is a serious question, and one which time only can
completely answer, whether steel structures will prove as uniformly and
permanently reliable as wrought iron has proved itself to be. In other
words, whether the fibrous texture of wrought iron can be equaled in this
respect by the granulated texture of steel or ingot iron. In this
connection it is interesting to note that the fibrous texture referred to
is imparted to wrought iron by the presence in it of a small proportion
of slag from the puddling furnace, and that this can be secured in the
Bessemer converter also if desired. The so-called _Klein-Bessemerei,_
carried on at Avesta in Sweden for several years past, produces an
exclusively soft, fibrous iron by the simple device of pouring slag and
iron together into the ingot mould. This requires however a very small
charge (usually not more than half a ton), and a direct pouring from the
converter, without the intervention of a ladle, which would chill the
slag."
The effect of the introduction of slag would seem to be to retrace the
steps usually taken in producing steel, viz., to separate the iron from
its impurities, and then to add definite quantities of carbon and such
other ingredients as are found to neutralize the effects of certain
impurities not fully removed.
Public-domain text, read in full here on John Shaqi.
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