The Cheyenne daily leader. [volume] (Cheyenne, Wyo.) 1870-1884, 1881-01-26
POPULAR SCIENCE.

Gerard-Lescuyer finds that when
the current FROM Q dynamo-electrie
machine Is sent into . magnetic cleo
tTic machine the latter moves with
Increasing speed, then IT, slaekens,
tiolL aud so on The polarity Of the In
dnetors Is reversed.
j. A Pabst publishes this eoRtinu-
ous method Of preparing seetie ether.
He introduces intoa nton & cold mix
ture of IS C. C., Of sulphurie acid, and
the same quantity of alcohol. When
the mixture has arrived at the tempo
nature of lao degrees centigrade, he al
lows to flow slowly into the retort .
mixture of equal equivalents Of alco-
hol and glacial acetic acid At first .
little sulphuric distils over, and these
then passes q liquid containing IS per
cent of acetc ether.
An improvement on the Bunsen
photometer has been devised by Herr
Tepler, and 1t is no longer necessary
to use but one eye or that the observer
take q certain determined positio-.-
The ordinary thin sheet of paper with
the oil-spot is replaced by two thin
sheets of parchment paper placed one
on each side of stout sheet of paper
perforated by o hole about an inch in
diameter. The sheets are stretched on
o frame between two sheets of clear
glass. When the lights are properly
opposed, the hole in this arrangement
disappears, just as the oil-spot does in
the old device, but with much less in
convenience TO the observer.
An exchange publishes the follow
ing as o means of ~silyering by cold
rubbing /: Make q paste by thoroughly
grinding In q porcelain mortar, away
from the light, water, 5 to 8 ounces T;
chloride of silver ounces; potassium
oxalate, 10.5 ounces +; common table
salt, Is ounces, and sal ammoniac, 3.75
ounces. Or, chloride of silver, s;
ounces; cream of tartar, 2 ounces /,
common table salt, 1915 ounces, and
water enough TO form a paste. Keep
the paste in o covered vessel, away
from the light Apply 1t with q cork
Oh brush to the clean metallic "copper"
surface, and allow it to dry. When
rinsed in cold water the silver pre-
sents Q fine frosted appearance, the
brightness Of which may be increased
by immersion Cor a few seconds in di-
lute-sulphuric acid, or in q solution
of potassium cyanide. The silvering
bears tho action of the wire brush and
of the furnishing tool very well, and
it may also be "oxidizcd."
NJ. Lcsserteur, says tho British Mol
ical Journal has just given publicity
to q plant which has q great reputa-
dom of AMMAN. This plant, of which
tlc IL IAo.-o. L. N Ef,1 -
Llama, closely akin to the false angos-
tura its effects are similar to those Of
'strychnine and brucine. M. Bouley,
in speaking of this new remedy In tho
Receua de Medicine VeSeslnaire, re-
grets that no facts corroborative of its
efflcaciousness are given, but is of
opinion that the property recently
shown to belong to rabbits, of easily
contracting hydrophobia by inocula-
ton, should be utilized for making OK
periments thus SO easily performed.
In reference to this subject, nj. Bouley
substance which has always had a
great reputation among remedies
against rabies, and is constantly found
a a principal integral portion In a
large number of formula long kept Sc
lcret. A young man had been bitten
by q mad'dog, and symptoms of rabies
speedily appeared. Ills family, in a
state OF the greatest alarm, scarcely
knowing what to do with the sufferer
shut him up in a loft where some gar
lie had been left to dry. In his deiir-
ium tho poor fellow seized the bun
dies of garlic, ate grccdily Of them, and
coon became exhausted and fell into q
deep sleep. When he awoko hc was
cured, and tho symptoms of rabies had
disappeared.