The Cheyenne daily leader. [volume] (Cheyenne, Wyo.) 1870-1884, 1881-04-03
SCIENTIFIC.

Oil OF sleeps feet is said to be much
superior to horse-footo oil and neat's-foot
on, with which it is generally confound-
ed In commerce. When pure it is of a
very pale yellow color, and weighs 915
grms. per litre.
The extensive studies of DIR. Decaisne
have proven to him conclusively that i'm
moderate smoking of tobacco produces
in certain subjeets-especially in women
and children-an irregular action of the
heart, which quickly disappears when
the cause is removed.
C~aoutchouc may be utterly ruined by
lie use of impure solvents, and those
experimenting with India-rubber-solu-
lions should, in caseswhere it is desirable,
degenerate the caoutchouc by allowing
the solvent to e~vaporate, taking the
Utmost care not to employ any solvents
Which contain fatty or greasy matter.
Swedish meteorologists have furnish
cd material for unlimited speculation
ly preparing a catalogue of the auroras
seen during the space of more than
three centuries-that is, from 1886 to
1877. The record shows that in the
eriod from 1922 to 1899 auroras wero
observed on 4.245 nights.
The St. Gothard Tunnel furnishes
another striking example of accurate
surveying. Although the entire length
of the tunnel is nine and a quarter miles
the two galleries were bored with such
precision that they met with a differ
ence of only four inches in level and .
lateral deviation of less than eight
inches.
To prevent the oxidation of a new
iron tea-kettle, first wash it thoroughly
in sapolio soap. rinse well in clear hot
water, and dry over the back of tho
stove. Scald. out thoroughly before u.s.
ing. and put one or two clean oyster
shells in the kettle, and keep some
there all the time until the kettle begins
to grow smooth and shows no longer
any sign of rusting.
One drawback to the recentlysdiscoy-
cred audiphone has been its large cost.
but NJ. Colladen, of Geneva, has, after
considerable experimenting, so simpli-
fed and cheapened the instrument that
3 serviceable audiphone can now be
purchased for fifty centimes instead OF
fifty francs, the former price. He SUBJ
stitutes q variety Of thin p~asteboard fol-
the hardened rubber heretofore used.
Look to your lightning-rods before the
thunderstorm season comes. Insulat-
ed lightning-rods are a dangerous de-
fusion; they are reverse of a protection
ton. So is every rod that don't run to
every high point on the house, not wei.
connected with large masses of metal
roof ornaments, water spouts. ETC.
and well sunk in the ground. 1t ought
10 come in contact with the damp earth:
better yet, with water.
The nutritive value of milk is hardly
sufficiently appreciated. According TO
best and most recent analyses, good
Ii or. casein, 2f d.. milk sugar, / o.,
and salts, phosphate etc, } nearly I OF.
Two quarts of milk, therefore, with IL
o.. bread, contain sufficient nutriment
for a full grown nan daily. No cheaper
| food of equal value and easy assimila.
lion can be found.
From reports made by the German
railway companies it appears that about
81 per cent. of their coaching stock is
lit with rapeseed oil, 16 per cent. with
Eas, and Is per cent. with candles. For
) really good light, the gas appears to
be much the cheapest illuminant. 1t is
prepared from various Hydrocarbons.
yielding substances, and is compressed
INTO holders from five and one-half to
Tx atmospheres.
Brannot recommends the following as
; cheap indelible ink. Twenty parts
Of potash arc dissolved in boiling water.
len parts Of fine-cut leather-chips and
i've parts Of flowers of sulphur are add
ID. and the whole heated in an iron
| kettle until it is evaporated to dryness.
Then the heat is continued until the
mass becomes soft. care being taken
that it does not ignite. The pot is now
removed from the fire and allowed to
sool; water is added. the solution strain
ID. and !, we'd in bottles. The ink
Cows ca I'M the pen.