Mineral Point tribune. (Mineral Point, Wis.) 1869-1938, 1898-09-08

less than twc-thirds of percent Of
the power used, for :, the ,.parpass z9f
driving an air motor at 100 pounds
initial pres sure. This would be
loss of 80 per cent, which would, Of
course preclude the use of liquid
air for power in the present state of
the art of manufacturing It
On the subject of refrigeration, Mr.
Richards, stating that the best ice
making plants yield seven pounds of
ice per p und Of coal, assumes that
the Triplyr compressor would use four
pounds of ccal per horse power Muir.
which would De equivalent tor 2,044
pounds of ice, as compared to about
] per cent. of the extremely cold
liquid, which could only be used with
difficulty.
In its use as an explosive, under
certain conditions. LIQUID air may find
a practical application AS yet 1t has
been only used experimt ntally in
some German coal mines. But the
difficulty IN handling is serious. as 1t
cannot be confined in cartridges,
neither can it be kept when pre-
Jared for use, more than a very few
minutes, owing 10 evaporation. But
indic3t lons are that where 4 regular
amount Ct blasting is .dene on a
'arge scale this fluid has advantages.
cor this purpose the liquid, rich In
oxygen, is used to saturate charcoal
in small pieces, which is quickly made
into a loose paper cartridge and det-
Grated In the same manner as dyna-
mite, 1t has the advantage that the
thus avoiding the possible ignition Of
FIRE damp in coal mines 'r 'n.I
Liquid air is, however, a. mDst VAL
liable agent in laboratory work, scien-
tifc research and Investigation. BY
its use the temperature of absolute
zero no doubt, will be obtained. en-
aiding further investigation OF The
theory of heat, The eject OF tenn
perature on metals may be studied
70 advantage by its use The effect
OF extreme low temperature on colors
is another field for investigation. Its
powers as an analytical agent promise
an important field for development
Promises Il important uses in medi-
Cal science are made Tn this con-
nection, a Russian physician, by its
agency. maintained a room at la
temperature OF 100 degrees II. below
zero After a dog had been confined
under these Conditions for ten hours
be was found TO be In good condi-
tion, and had an enormous appetite.
The experimenter then subjected him
self TO a period OF ten hours In the
dry cold and stlll atmosphere. and
found that his system was greatly
stimulates and the intense com
bustion requ red by the system to
keep warm resulted in n great, desire
for food, Continuation u the ex-
periments had the effect OF making
both man and dog more vigorous.
III his case 1t Is assumed that an at
mosphere high in, oxygen was en-
ployed ~, i'''
In the way of commercial uses for
liquid air, Dr. Linde is now having
built for the Rhenania chemical
works at Aix-la Chapelle t2o-horse-
power machine, which is expected
TO produce alb ut eleven pounds of
liquid per horsepower ho,T. This
machine will be used, to. improve the
Deacon process for making chlorine.
The cifce Of the machine will be
to substitute gas rich in oxygen for
atmosphere, and 10 effect chlorine
separation by the agency Of cold,
without compression
1t is, OF course, true that where
cost is not an item of ,importance,
that very great refrlgoratng effects
may be pr duced by liquid air, This
holds true also of its use for power,
provided a means Of utilization Ia
secured, as the en- rgy that may be-
confined in small space 10 enor-
nous. and the possibilities in this
direction will appeal TO Scientific in