The Saint Paul globe., 1900-12-16
ton of chemicals is assured.

ton of chemicals Is assured.
Sixth-In medical science liquid air is
proving one of the most valuable aids. to
the prevention of disease and for the al
deviation of sufferlngS
This is just the beginning. In any one
of these branches there is ample scope
for lifetime of experiment and discov-
cry. Already scores of the most learned
scientific men Of the world have aban-
doned all other research, and are giving
up in devotion to some branch of the
advance Of liquid air as great factor in
the worlds progress. The first great OBJ
Stacle has already been removed. The
first ounce Of liquid air that was ever
made cost 5000 Today is is manufac-
tured for one and one-fifth cents per gal
Ion.
WHAT IT IS ALREADY DOING.
AS energy. one cubic foot of liquid air
Is proved to possess somewhat over ten
million foot pounds of power. 1t is al
ready running engines automobiles and
other machinery with success sattSfac-
tory both in the matter of power and
economy, especially when liquid air has
been used first for refrigeration. In the
matter Of refrigeration, with q temper
azure. of, BIZ degrees below zero, it can
not only manufacture Ice in Wfla tSOeVers
quantities desired, but also to .refrigerate,
meats and frEitS for transportation by
land and sea, supply of the air in q.
receptacle being now available for a perl
cold at the will Of the operator, at a cost
not. to exceed ice, and with the added ad-
vantage of the dry cold which is the
commodities
As a Producer. Of heat it is enough to
demonstrate with the simple experiment.
of burning a bar of steel In jet of
LIQUID air from the exhaust of an engine
after the air has passed Through all the
uses of refrigeration and power. At the
present time the combustion of coal bare
| kx- fEes 1o,. =
proved furnaces. but with combustion
of liquid air the combustion reaches
nearly 100 per cent. thereby affordfng the
most complete combustion Of any known
| agent.
AS an explosive, 1t Is only necessary to
state that liquid air in confinement has
a known pressure of IL. 700 pounds to the
square inch Is converted into gas at or
dtnary. tenlpera tlIre and constant volume.
and. in combination with a hydrocarbon
IT produces an explosive of such safety
and efficiency wttha1 that 1t is fast SUI
perseoinG nitroglycerine and other expIo-
siyes in mining and other industries
where safe explosives are of daily need.
AS A PURIFIER. OF CHEMICALS.
In the purifcation of chemicals we ap-
proach one OF the newest and most vaid-
able uses, to which liquid air has been
made available. The field here Is fncom-
parably vast In all liquids the COM
poEent ingredients. can be entirely sep
arated by LIQUID air and the Impure and
de4leterious matter eliminated.
| For instance, take a vessel containing
| whisky of doubtful purity. BY reducing
1. the temperature down to 80 above zero
| we separate the alcohol and other ingre-
| dents from the water which freezes at
! tins point Continuing the process, be-
! tween $50 and 120 below zero fliseI oil and
| other deleterious ingredients freeze, leav-
ing more alcohol, which itself freezes at
| 202 below zero. Thus at successive stages
OF 1reezlng the component parts of any
Hquld compound may be separated one
from the other, the impure elin:nat ted
and the pure recembined for practical
use.
This is a question of immense value
when We. consider that impurity enters
INTO almost all drugs. often having the
from the one Intended. The impurities OF
| ether for Instance, account for a large
per cent of the deaths during; sllrgi1 al
operations, when by the aid OF liquid air
the impurity may be enttrely eliminated.
Used AS AN ANAESTRETIC.
+ In medical and surgical science LIQUID
| air IS destined to. become absolutely in
come a, factor as a substitute for anaes-
thettess Slow freezing means death to
the tissues, whereas quick freezing dead
ems the parts temporarily, enables an op
Grafton to take place without pain and
/ recovery without Ill effects If a rese IS
| wither and collapse: if plunged into liquid
air and frozen Instantly, it Will thaW
out and be as fresh as ever.
But in the, separation of the component
/ parts of the compound nitrogen 80 parts
and oxygen 20 parishes the greatest use
in therapeutics aside from the purification
| of chemicals, as mentioned before The
/ problem of getting cheap liquid oxygen Is
one of constant concern.
i Moreover, highly ozggenated foods for