The Baltimore County union. [volume] (Towsontown, Md.) 1865-1909, 1903-11-07

New Parasite-EIectric Speed-Indica-
tor-Aero-nautica1 Progress-zebra Do
mestication-Diving of Whales--Noise
Abating.
Mapping the magnetic fields of force by sprink-
ling iron filings over sheet.of paper resting on
magnet is a familiar experiment. In study
ing the diffusion of liquids, NJ. Stephane Leduc
has made photographs Of the phenomena, and
the pictures reveal fields of force so strihngly
like those of the magnet as to suggest that the
manifestations must be related. drop OF
aques solution in distilled water radiates mole
cules in many directions. this being positive
pole of diffusion. drop of water in an
aqueous solution, on the contrary, gives mega
tive pole of diffusion, and bipolar fields Of force
of the same or opposite waves may be produced
with two drops of water or solution about an
inch apart. When similar poles of diffusion
produce spheres that meet, they form polyhed-
ra, giving kind of artificial cell.
-
The finding in meteorite of the only known
perfect diamond is held by e. NJ. Souvielle as
sustaining his theory that all diamonds are Of
meteoric origin. The carbon must first have
been intensely heated in the absence of
oxygen and It must then have been submitted
to great pressure through the sudden external
cooling of the matrix rock. The necessary con-
ditions cannot have existed on the earth.
Sc
Some beautiful experiments in the produo-
ton of mercury bubbles have been described
by Henry H. Dixon, of Doublin. The mercury
is covered by water to the depth of about three
fourths Of an inch, and the bubbles are pro-
duced by boiling the water or by forcing cur
rent of air or water under the mercury through
a small tube The bubbles rise to the top Of
the water, linger a moment, then slowly sink or
are whirled around the vessel.
sSs
"A French milking machine consists of a conf
cal brass receptacle, with sucker-terminated
rubber tubes, and an electric motor for initial
ing the suction of the calf.
-
Not least among the terrors Of war Is the
spread of disease to new places. The new para
ritic worm discovered by Prof. ]. d. Whites,
an English dental instructor, seems to have
been brought to England by soldiers returning
from South Africa, and to have been distributed
to COWS through forage plants from a sewage
farm, the milk from these COWS carrying infec-
tion to human victims. The parasite, which has
been named Filariensis whitteleri was first de-
tected in young woman dental patient who had
acquired her maady through fondling and kiss
ing pet dog. Since then it has been found in
the blood of many persons it's presence being
indicated by troublesome itching of the skin Of
the upper and lower extremities and the chest.
80
A novel German speed-indicator for machine
tools is simply small electric generator and
voltmeter, the generator being driven by the
shaft whose speed is to be measured. The volt
age varies with the speed of the driving ma
chimes, and the dial of the voltmeter can be
marked off In revolutions per minute. Not
least among the advantages is the fact that the
indicators may be placed at distance or in any
position most convenient to the managers.
IS
Some important improvements by Mr.. Fox, of
the British Aeronautical Society are claimed to
enable the aeronaut to ascend and descend
many times with the same gas and to propel
his balloon in every direction at greater speed
than heretofore. The balloon is inflated with
condensed gas, which can be heated or again
condensed as local atmospheric conditions may
make necessary. The propellers are novel, and
by combined action of gearing and shafts can
be made to give thrust in any direction.
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Both German and British experiments on the
domestication and training of the zebra are be-
ing made in East Africa. Among the probable
dufduIdBcS VI ILLS dultudl dEO lbo HcSlSIduCo W
the deadly tsetse fly, thirty zebras intended for
export to Germany, having been taken safely
across an infested tract of country that is most
disastrous to horses.
Whales are credited by naturalists and whalers
with diving to great depths, even to thousand
yards, but DIR. Racovitza, a Belgian writer shows
reasons for believing that they never go below
a hundred yards. They dive to obtain food,
which they could not well do in the darkness of
great depths. A pressure of three atmospheres
is the greatest human life can endure, and while
we may assume that whales can stand three
times this pressure. or nine atmospheres, it is
hardly conceivable that they can resist ten
times the latter. 1t seems scarcely possible,
moreover, that with body only slightly heav-
Ter than the water at ordinary pressure, whale
could exert sufficient muscular force to propel
that body to depth of thousand yards.
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Much complaint is made on account of the
noise of the Berlin elevated electric railroad,
which was opened last year. The first attemptto
lessen the sound consisted in placing three lay
ers of felt between the rails and the wooden
cross-ties, but this, while giving improvement,
was insufficient. Another partially successful
remedy was the substitution of sand-flled hol-
were then laid on lead cushioned sleepers with
out cross-ties, the sleepers running lengthwise
and finally the car-wheels have been lined with
wood. Tests are still in progress, the ideal
remedy being yet unknown.
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Discarding gargles, DIR. Bergman conveys
drugs through the medium of the saliva. The
flow of saliva is promoted by chewing tablets
which are specially indicated or adapted for
throat affections, dyspepsia obesity and adema.
The alkaline saliva is particularly beneficial in
acid dyspepsia.
The solar engine of Capt. w. A. Jaques has
small steam boiler In the concentrated rays of
the sun and a condensing steam engine. A
motor of 10-horse-power, costing about $4,000,
has refectors So feet in diameter and containing
10000 square feet of surface.