The Eaton Democrat. (Eaton, Ohio) 1875-1903, 1877-11-29
Scientific and Useful.

A Welsh gentleman has invented a
new engine of warfare, which will be
likely to attract considerable attention.
1t consists of a cannon, % arranged as
to discharge a sharp sword blade cross
wise in the direction of the enemy, the
knife or cutter being so poised in its
career through the air as to cover the
whole space in a longitudinal direction
described by the blade itself. An eight
inch ball would carry a sword fourteen
feet in length six hundred yards now
ing down every human obstacle in its
path.
Muscular contraction is always accom-
panied with electricity phenomena. The
difference of electric force between two
points of muscle undergoes a diminu-
ton, which, according to Bernstein, pre-
cedes the contraction by 1-100 of a sec
ond. M. De la Roche has recently ex-
amined the electrical power of the
human heart. The electrodes consisted
each of a plate of amalgamated zinc
with a pledget of muslin saturated with
sulphate of zinc at the lower extremities.
These were applied, one with its muslin
wad opposite the heart on the left
breast, the other on another part of the
chest, and connection was made with a
capillary electrometer. The mercury
column executed a very distinct series
of periodic pulsations, synchronic with
the pulse. Each pulsation marked the
double movement Of the heart. The re-
suit obtained corresponded to 1-10O of a
Daniel element.
President Bodeker, with a view to ar
rive at certain results, has analysed the
milk of a healthy COW at different
periods of the day. The Professor found
hat the solids of the evenings milk I3
per cent? exceeded those Of the morn
ing's milk 90 per cent?; while the
water contained in the fluid was dimin-
shed from SO per cent. to Sc per cent.
The fatty matter gradually increases as
the day progresses. In the morning it
amounts to 24 per cent, at to 81
per cent, and in the evening to 81 per
cent. The practical Importance of this
discovery is at once apparent; it de,
velops the fact that, while 16 ounces OF
mornings milk will yield but half an
ounce Of butter, about double the guam,
tity can be obtained from the evenings
milk. The casein is also increased in
the evenings milk from q to "a pei
cent, but the albumen is diminished
from GA per cent. to OBJ per cent
Sugar is least abundant at midnight a!
per cent and most plenty at noon (9l
per cent? The percentage of the salt
undergoes scarcely any change at any
time of the day.
Gold is the most common metal found
in nature; it is more or less diffused in
the primary rocks in all parts of the
world. The question has not beer
where gold is to be found, but where il
can be obtained in sufficient quantities
to pay for the labor of extracting it
Gold is found in the tin streams of Corn
wall and is frequently associated witt
the oxides of this metal, in the schorla
ceous states and GRANTEES, and very com
mon in the grossans of iron and copper
it is detected also IN the ferrofelspathit
and slaty rocks of Scotland and Wales
and their intersecting r%avines. The re
vival of the gold discovery in the stream
of the BALM Valley, in the county o
Wicklow, in Ireland, caused almost thu
whole population of the neighborhood t.
neglect for the time the produce of thei
fields; all focked to the gold harvest
steam works were established, and con
tinued for a few years, and many hug,
Jumps were found; but the superficial
product was soon sunk in the quart
mining; and such has been the case il
many other parts of the world, wher
such works have been carried on b.
mining companies.