The Baltimore County union. [volume] (Towsontown, Md.) 1865-1909, 1900-06-16
Corysspondsnes Baltimore County Union.
SCIENTIFIC MISCELLANY.

l.
The NaturalIsts' Telemicroscope-Anim
Temperature = Engineers Deafness =
Another Solution Of the Waste-Heat
Problem-A Useful Rubber Imitation
Gas Preservation Of Food-Riding Head
Downward-Sterility Of Flowed Land.
kind of combination telescope and micro
scope has been worked out by French micro
scopist for studying live insects and their habits.
The new apparatus is called the "telemicro-
scope" and is really small telescope having
an objective formed Of two achromatic lenses,
which can be moved nearer together or sepa-
rated by sliding the tubes. For the purpose in
tended, the magnifying power necessary is only
10 to Is diameters. Besides serving for watch
ing insects moving on the ground. the instru-
as deld-glass.
The slight variations in the body heat of ami
mails, even in the greatest changes Of atmos-
pheric temperature. is one of the wonders OF
physiology. NJ. Francois Stepinski finds that
the average temperature of man in health Is 96o,
and that the variation from this is rarely more
than to degrees, although there are regular
daily changes of temperature. slight seasonable
variations, and a slight rise after eating and
work Of any kind. Age makes much less diff
ference than Is usually supposed. Yet while
the average central temperature is so constant,
there may be striking local variations, and the
skin temperature sometimes differs four to
twelve degrees in few hours. Disease, as is
well known. greatly affects bodily temperature.
-
The deafness of locomotive engineers and fire.
men has been looked upon as effect Of the
whistle. Mr.. George Trebel points out that this
cannot be so, and finds that the engineers are
deaf in the right ear and fremen in the left.
leading him to suggest that the cause is the inn
pact of the wind on the ear-drum as the men
lean from the cab. The sound Of the whistle is
scarcely noticeable, while the men on the slow
moving yard engines are not affected.
AFs
strong dislike to the odor of peppermint
has been discovered In mice. Cotton soaked in
peppermint oil caused them to go away for q
considerable time. and after a second applica-
ton they disappeared completely.
a.
To double the capacityof apower plant, with |
out increasing the size of the boilers or the con-
sumption of fuel. is rather startling PROPOSE |
ton at the present day. This result, however, |
is what Prof. jesse, Of the Technical High |
School Of Berlin, believes be achieve |
through device that was tested unsuccessfully |
some ten years ago. the idea being to run sec I
ond engine, driven by sulphurous acid or other |
liquid of very low boiling point, with the heat |
of the exhaust steam from the first engine. In |
the new auxiliary engine the sulphurous acid is
made to pass through a complete cycle of |
vaporization and condensation. For each indi-
Gated horsepower hour the normal steam con-
sumption of the steam engine working alone |
was 1opounds and this was reduced to IL pounds |
when both machines worked together, while 1t |
is believed that a reduction to about s25 pounds
is practicable on large engines.
Every promising substitute for rubber and
Eutta percha is being eagerly investigated. |
Velvril, new artificial rubber lately described |
hnseed or castor oil with nitro-cellulose, the |
elastic and other properties being subject to |
great variation BY alterations in the proportions
moulded under heat and pressure, or applied in |
solution, the solvent being then evaporated. |
English climate better than rubber. it is superior |
to vulcanized rubber in its freedom from action |
have not been fully studied, it can Be recon-
mended already for great variety of purposes, |
such az machine betting, waterproof cloth, hose
and tubing, floor coverings, paints, etc.
Night-terrors in children are found by DIR. E.
dependent on digestive disturbances than is
generally supposed. They are largely due to
difficulty OF breathing. and are common in rheu-
matte children, and associated with ricketts,, en-
larged tonsils, errors of refraction, and tape
worms.
For zapon or celluloid varnish, product of
best results by dissoi7ine > parts Of coiorless
,elluloid waste in 20 parts of acetone, solution
and ADDING Is psrts days o IN acsas
The varnish is clarified by long settling.
By the newly patented process Of Herr F. W.
y. Graeff, of Berlin, animal or vegetable sub
.Ts Rfssfryfaf Blk nse1fc AZ
pregnating them with an inert gas-sucn as AZ AZ
sired pfessns and nnaliy healing up hermeti
oaily IN suitable receptaeles LIQUIDS may DC
to become industrially important, for it is
adapted to every kind of perishable material,
cream, milk, whey, etc. The liquids are restored
to their original condition by heating or boiling
In recent audacIous plan for a centrifugal
pleasure railway, 1t was proposed to have the
passengers travel head downward over portion
Riley, Doublin railway man. that such road
was actually built and operated in Liverpool |
about 40 years ago. 1t was of Is or inch gauge.
and the single car. holding one person, was
drawn up an inclined plane to the top OF high
tower by q windlass; then was allowed to run
a vertical loop of large diameter, then over
low tower and round circle to the starting |
point. The trip was not popular
Wood pulp and sawdust are made incom--
buBttble. according to q method just patented |
by Mr.. e. M. Fox of Westminster, Eng, by |
placing in boiler containing hot solution Of |
sulphate and phosphate of ammonia, and pro- |
vided with a stirring and mixing apparatus and |
q temperature regulator. The material is after |
ward COMPRESSED to free it from moisture. The |
treated pulp may be used for paper or other |
purposes and the sawdust for packing goods, |
beading walls, or jacketing steam-pipes.
80
The injury to soil from flooding by a high tide |
Is variously estimated to last for five to twenty
years. A late Investigation in Essex, Eng, |
showed that the soil was left with two per cent.
OF salt, twenty times the normal amount but |
that the damage was probably due mostly to the |
complete destruction of earthworms.
Property TransfersinB Baltimore County. |
Deeds. Leases Mortgages. Bills of Sale, etc., |