The progressive farmer. [volume] (Winston, N.C.) 1886-1904, 1896-12-08

Another FORM GubG GuS 400AAn6 H"0
taken is the arrangement IN burial
vaults of an electrical annunclator,
which is Immediately excited to give
an alarm should there be the slightest
movement inside the coffin. The latest
of making assured the fact that
death has taken place is the use OF the
r Dentgen ray. Hands OF the living
and of the dead, taken on the same
plate by the x ray show a decided diff
ference. The bones of both are about
equally we'll defined, but the soft parts
of the dead hand are n~oticeably darker.
If the picture be taken within a few
hours after death it is some times not
a to diff rentiate between the living
and the dead hands; but as the charge
in the tissue begins to take place the
x ray show a decided difference in
penetration. DIR. Carl Brown states
that this method will determine p >sit
lively whether death has occurred or
whether the patient is in a trance.
ESSAYS ON ELECTRIC HEATING
American electricians have been max
ing great strides in the various depart
ments of electric heating, and it is by
no means unlikely that emOng them
will be found competitors for the prize
of $1,000 offered by the G 4rman Ry-
gienic association for an essay on the
efficiency Of electric heaters. The fol
lowing are the terms; The heat given
out by the heaters in various heating
installations is to be ascerteined. The
invests ations are to be described IN
detail in respect to the arrangement Of
the heaters, the nature Of the heating
agents and the observations made; and
they are to be illustrated by drawings.
The heating values obtained are to be
stated in units Of heat given eff per
hour per unit Of surface. In the case
OF heat given out to air, the inves5iga
ton must b8 conducted with currents
Of s;r ct speeds as different as possible.
T1e heaters are to be described IL de
tell as regards form and measurement
ard the relation Of their heating eff
cheney to their weight is also to be as
certained.
ELECTRICITY USED IN SURGERY "A
washer woman in St. Petersburg al a
broken needle into her hand and was
unable to extract it. After two months,
when the baud had become so inf4med
and painful as to be useless, che called
in her doctor. He Immediately said it
was no case for him, but for an cleo
trician. The electrician was sent for
and the hand Of the woman was placed
on the pole Of a weak electro-magnet,
which was excited by three cells. The
object was to draw the needle out,
point first, and by degrees. According
~ the experiment was repeated day
after day for an hour or two at a time,
the current being interrupted SO as to
urge the needle forward. At the end
of nine days it issued from the skin
without the loss Of a drop Of blood. and
stuck to the magnet. The current
acted for twenty hours altogether end
there was little or no pain. 1t may be
noted that the electro magnet is now
an indispensable part of the equipment
Of the o~culist, by whom it is used for
the extraction Of metallic substances
from the eye.
PHOTOGRAPHIC MARvELs. In making
instantaneous photographs of the
splash formed by q falling liquid, Prof.
Worthington has succeeded in giving
an exposure of less than three one
millionths Of a second. This is effected
by an electric spark, which can be so
accurately timed that the operator can
select any desired stage in the progress
Of a splash within limits of error not
exceeding two one thousands Of a sec
ond. A Photographic printing ma.
chine, exhibited at a recent ''conver.
s~azione" of the Royal society, had a
roll of prepared bromide paper fed in
at one end and turned out finished
Photographic prints at the other at the
rate of 2. 600 or 8 900 per hour. These
photographs are used for illustrations
in newspapers and magazines.
CHAINLEss BICYCLES. -Cheinless bi
cycles, in which two pairs of bevel
gears are used, instead of a chain, are
reported, according to Engineer News,
20 have proved their superiority over
the present style of wheel in a test in
which a wheel was run 0 1000 miles
without adjustment or appreciable