The Delaware ledger., 1883-08-18
solenoei

Americans.
Geology is said to be the most popular /
of science In Spain. The
mining exhibition at Madrid is a great
success.
The smell of fresh paint in room
may he effectually gotten rid of by |
placing therein pail of water in which
a few onions have been sliced.
Water used in wool-washing yields |
4.50 per cent. of very dry potassium,
which can be recovered, as NJ. Delattre
has shown, at considerable profit.
DIR. Siemens calculates that the pres
ent annual yield of all the coal mines of
the earth would suffice to keep up the
fire of the sun, at its present intensity of
light and heat, for about the forty-mil-
lionth part of second.
According to the Scientific Californian
an instantaneous remedy in cases of
poisoning consists of heaping tea
spoonful of salt and the same quantity
of ground mustard stirred in teacup
of warm or cold water and swallowed
instantly.
A writer in the Scientific Californian
suggests safe method of drinking out
of cups at fountains erected for public
use. 1t is to put the lower lip inside of
the cup and sip the water, instead of
placing the edge of the cup between
the lips.
A substitute for India-rubber has
been invented by NJ. M. Dankworth and
Landers, of st. Petersburg. 1t is COM
posed of mixture of wood and coal
tar, linseed oil, ozokerit, spermaceti and
sulphur, which are thoroughly mixed
and heated for long time in large yes
sells by means of superheated steam.
At a meeting of the Linnean Society,
London, last month, Mr.. G. Murray ex-
hibited specimens of dace killed by the
fungus disease (SoprOlegnia ferar), the
result of inoculation. He asserted that
this was the first recorded experimental
proof of the possibility that this disease
could he communicated to fishes.
Messrs. Elster and Geitel state that
the views of Hankel ON the electricity
of flames, published in 1858, but only
recently come to their knowledge, have
been confirmed by their own expert
ments, which show that galvanic ele-
ments may be formed of heated gases
and metals without the introduction of
a flame.
\ contemporary maintains that the
persistent use of the microscope is the
only means whereby the necessity for a
: change of yeast in brewing can be as.
5 certa.ned, and that the examination
= must be kept up from day to day. As
soon as the cells are seen to become
| elongated and lose their rotund shape
there is something wrong.
] At Nakskov, in the Danish island OI
: Lapland, the gas company lights the
! streets gratuitOusly, as a return for thu
e monopoly which enables it to suppl,
: nearly all the houses with gas for cook
a ing, heating and lighting. For heating
y purposes the price is 9l cents per thou
$ sand but for lighting, the compan!
t charges $l20.
Il Within the last few years the devel
l opment of the coal-felds Of Asturia
u has greatly advanced. In 1852, 2l9, so
/ tons were raised, against l67, $50 il
Z 1878. But the near future, with tn
demands of railroads and industrial es
Il tablisnments, will soon make the pro
duct much greater than the former fig
ures even give any idea of.
>, Mr.. j. f. II. Gordon, not late
than three years ago, was a strong ad
: vocate, as he acknowledges himself, G
:, dynamo-electric machines occupyin
very small space and driven at
high rate of speed. Now, after a cost
y ly series of experiments, lie finds tina
large machine driven at compare
- lively slow rate gives incomparably tn
- - best result, and does not endanger lif
;, by flying to pieces.
,r Six Algerian engineers who hay
n been consulted by NJ. de Lesseps on tn
O. inland sea scheme, report that the cut
r ting could he made within five Years :
cost of $50, ,000,0 900. Anaverage widt
OF eighty or 100 feet would be sufficient
rs the current would widen the canal
and since it would be nearly in
straight line the navigation would
10 devoid of difficulty. A vast tract
W country lacking only moisture to becou
en- very productive would thus be hroupl
ed under cultivation.
u II has been observed by Swedish q,
q, gineers that the quantity of phosphor,
In the pig-ron manufactured vii
- charcoal is larger than that in the O
- and fuxes, even assuming that all
. 1t had gone into the pig. Jansen foll
that when he melted ores in crucibl
20 =. the metal obtained ran lower in pho
m phorus than the pig obtained from d
az az same ore. Sarnstron, in 1881, ma
a M some analyses in charcoal, which see
y to lead to the conclusion that the G
10 cess of phosphorus is due to that specj
10 of fuel.
he Nickelcrucibles, instead of silver on,
for are recommended by NJ. Mermet
res use in chemical manipulations. Nicl
ars indeed is slightly attacked by melt
val potash, but so is silver itself. Mel
20 crucibles cost at first much less th