The Washington herald., 1921-07-03

OF These will be used tor making
liquid air There also vertical submarine type COM
presor with capacity of twelve cubic feet of free per
minute to be used in connection with the liquid hydrogen
cycle and similar compressor with capacity of eight
cubic feet of free air minute for in connection with
the liquid helium cycle These compressors will all be
driven by variable speed motors and be equipped with
loading valves that the capacities be varied within
wide limits In addition, there will be adequate equip
mcnt of gas holders machine shop, and chemical and
physical laboratory
A IL Thermometers would be useless such low
perature will be reached in this laboratory Even
thermometers which gas would be vaueiess as
nitrogen Thermometers would Qufy 1857 degrees cent?
grade below and hydrogen thermometers would be
useless after temperature OF 2528 degrees centgrade be-
low zero had been reached Temperature is measured by
of thermo- couple" consisting of metals which
have the to create electrical The poten.
aly of the electrical varies according empera-
and this difference is measured by of finely ad
Jused apparatus and the tempe thus determined
There a number of laboratories in the country
that have liquid air machines" Dr. Moore said. There
three four that have equipment for making liquid
hydrogen, although up-todae liquid hydrogen has only
been made twice in this country very small guam
titles. There is laboratory outside of the in the
United States Bureau of Mines that has equipment for
liquifying heIium"
1t has been discovered in connection with helium that
it may be purified after in the drigbes, stored and
used again This of vital importance in view of the
initial expense in the production.
The army has constructed a republication outfit on
railroad The first contains the power plant
and the second contains the compressors and reg
Grafton equipment The Bureau Of Mines has been asked
to design and install charcoal republication unit this
car, and this work is under way, the equipment being
partially constructed in the cryogenc laboratory and the
whole will be tested this laboratory before installa-
ton the car If this work is it is probable
that will be Of sufficient value install in the production
plants also in order step up the cruder product which is
obtained in the plants to per heum which be
obtained by of the charcoal The importance of
having the higher product exceedingly great dirigble
filled with per heum rather than % per will
have much greater lifting power. and also wider range
of operations
A LTHOUGH the production of helium has not reached
~ a stage where it may be SAD to be available fer
dirigble air ships a large scale there is every
believe that will be- In fact there are
fifteen twenty tanks of heum gas stored in the
laboratory of the Department Of the Interior Each of
those tanks holds times much helium was in the
world at the beginning Of the recent And this guam
tty is only small part of what is being produced at the
army and navy plants in Texas.
The commercial value of helium is without limit for
it absolutely the danger Of fire to the huge gas
filled air ships 1t also makes greater radius of flight
possible, helm does not leak through the fabric as