The Cheyenne daily leader. [volume] (Cheyenne, Wyo.) 1870-1884, 1881-08-25
P0PULlR scIEscE.

II Is always worth the trouble in Q
xrge library 70 take down the vol
ines when busting and examine for
gormG A mild solution Of carbolie
| cid, one part Of acid 20 forty parts
II water, Is valuable yermifuge 10
inject into the cracks Of the wood
work.
Two stations for scientific and hos
| 3ital purposes are to be established
,y the French section Of the Interna-
:ional African association One of
hem is to be at Oussagara, under the
direction OF Capt. Bloyet, and the
other on some tributary of the Ogooue
| liver, near the French colony of the
aahoon, under the charge of M. Mig
IN
1t seems that Vienna Is exporting
arge numbers Of false turquoises,
closely resembling genuine ones. Tho
aacks of every specimen are pecked
put and the holes filed with q black
cement to initiate the matrix of La
rielle Roche. The spurious are o
little lighter than the real t~urquoises,
but the specific gravity test Is not to
10 relied upon. An expert in gems
advises purchasers to scrape off the
matrix, and IL the specimen is spuri-
ous the artificial perforations will be
revealed.
A mixture OF sulphur and grease
has been in use for some time as q lub-
ricant for the bearings Of heavy shaft
ing. Sulphur alone, as Is we'll known
has the effect, when properly intro
iuced, Of cooling o hot bearing. But
why sulphur should 90 act has not
been we'll understood. Won Heeren
offers this explanation Fine metallic
lust Is formed when q journal be-
comes hot, and this dust combining
with the sulphur, produces q soft and
greasy compound of o decidedly anti
frictional character.
How closely Japan IL following in
the footsteps Of the west may be seen
In tho fact that the japanese work.
men have adopted q trades-union sys-
tenn, which they will find by and by
% not altogether 70 good . thing as
they suppose. In their first Struggle
with their employers, in the province
II Mino, where rice has risen In price,
! rise Of wages was obtained, so that
. carpenter who wal paid twenty-five
ven now gets thirty sen, and the labor
.r who wss paid sixteen sen, six rim,
o gets twenty sen
II seems that the introduction OF
magnets into the great grain mills OF
The west has fulfilled the highest ex-
oectations Of those who complained of
wire In wheat. Not only have tho
magnets captured all the stray pieces
pf Iron bands, and thus removed tho
last and only objection urged against
wire banding harvesters, but they
nave revealed the singular fact that,
Of tho scraps Of iron and steel which
lind their way to the mills mixed
with wheat, fully one-half are somc-
thing besides pieces Of wire, and q
larger proportion Of those are of such
. nature as TO be even more dangerous
10 mill machinery. The magnets
gather everything Of this kind with
uncrring certainty.
Nal. Majendi, in speaking Of the
ignition OF gCnpowder by simple
percussion, says: "There Is ample
testimony that gunpowder can be ex-
ploded by blow with comparative
case, the fact being that the tempera-
lure at which gunpowder explodes
(about $40 degrees to $50 degrees) IL
readily reached by percussion or fric.
ton II the powder be 90 placed that
there 10 no absorption Of the energy
by the cushioning of tho blow, that
this temperature 10 . long way within
that at which heat becomes visible
Copper tools may be made to give
out sparks. / have had much expert
ence of this in some experiments
I made. The great thing for young
men to avoid, whatever tools they
use, even wooden tools, 10 the exercise
Of force beyond what Is absolutely
necessary or disaster may follow.