The Houston daily post. [volume] (Houston, Tex.) 1886-1903, 1900-04-17
The Posts Popular Reading Coutl
DECENT SCIENTIFIC DISCOVERIES.
,convriaht 1900 by Seymour Eaton)

choice OF substances, very low \.
lures have been produced. Tia go
still used and must continue n ~
past 1t has been an expensiye ns.x
cause the substances which -.ss
as cooling agents were themsclys' !,
fed or solidified with more d n.
Guilty 1t Is not necessary. now.
a substance should be In a llomx Z
form to produce a cooling efiea
may be made to cool itself.
Heat Changes In Compress,..
Expansion.
Everybody who has ever nu,nr..
bicycle tire with hand pump ~
the compressed air is hot The W.
upon the air by the pumping Ine,s..1
store of heat and raises its tems-sl
II the air thus compressed Is allorss :.
cape into the atmosphere, Il "a Z. \
away the outside air. doing wori ~
and is cooled In the process. Mor.s.9
the compressed air has been sIl,s',
cool TO the ordinary atmospheric Nv
ture before it Is released, the its,.'
Of expanding air will be fell "A h.
tinctly cold. This is the actIa, \
which the modern "regenerativs ~
Tbo Rcgenerative Metbox
This method Is used on a con,a.
scale. chiefly by three experimental n
/ in Germany, Hampsin in Eprls,s ,
Tripler in America. AS Trlplerf =
tons seem to be the most extenB,'
we'll as the most interesting to u r. \
reasons. his method will be descyh,
far as 1t is publicly known. It i n
absurdly simple. There is an Is p
pressor operated by steam power. Nj,
which the compressed air Is coolx !
! temperature OF the water runnsy
them, and a ''liqueier,' as II Il A.
I from which liquid air is drawn ~ 4
Ion when the plant is In operation.
The air is compressed three tina
cooling between; first, to about r
pounds above the atmosphere prr1
then to about 400 pounds, aud lasi ii
pounds to the square inch. The II
filtered from the air before II entss
compressor and there is another sepssti
at the highest pressure to take out IN :
traces of foreign matter. The eli M
pounds pressure and at the ,empssl
of the cooling tanks then passes |,
liuuefers, of which there are two. ;
what the construction OF the liore5s|
is not publicly known. Their esx
parts are long coil OF copper !uh \
rounded by cylinder which Is tAuuy
wrapped in insulating material TED
pressed air passes through the ccpps !
and is released at the end by mean
needle valve, said to be Of soma pu1]
larly advantageous design. AT this 4
/ 1t expands to about the atmosphstie n
sure, and is very greatly cooled h 4
process. This expanded and so,hl
then passes backward over TIE oil
pipe and escapes, cooling the tonp%
air within, which, in its turn, tifi
ut the valve and Is still further NJ
The process is, therefore, prcgressiwi
! cumulative in Its cooling effect u.
lowering of temperature at the n
point soon becomes so great that r'|
the air liquefles and collects In The
end of the liquefiers, from which ~
!, drawn off like SO much water BY ~
a tap.
Not the least wonderful thing shces9
/, that this liquid air, at a temperate!
below any OF which we can have i
! uuate conception, is handled IN appsl
the most careless fashion without
!, poured about like water, and .rlr'F
hundreds of miles in open bucisa