Atlanta tri-weekly journal. [volume] (Atlanta, Ga.) 1920-19??, 1924-04-12

| l1tioniZing conceptions of steam en-
cheering, has been given a trial
at Rugby. 1t is capable of producing power
from coal at an overall efficiency of some
thing like % to 80 per cent. This approach
es the efficiency of the DIESEL oil-burnng
engine, which is about 35 per cent and is
in contrast to II to 18 per cent efficiency
for the most modern super power station at
$50 pounds pressure and 700 degrees Fab
renheit superheat. It's efficiency rivals that
of the mercury vapor boiler recently
developed in America.
The generator is the invention of M. Ben
son, of the Benson Engineering company of
London. It's principle is the production of
steam at pressure of 5000 pounds per
square inch and at the critical tempera-
ture" of water, 706 degrees Fahrenheit.
This is by far the highest pressure ever
uesd in steam production.
The Critical temperature" of any liquid
is the temperature above which it no longer
can exist as a liquid, no matter how high
the pressure. Above that point the whole
of the liquid changes suddenly and COM
pletely into gas without alteration of
volume The phenomenon can be observed
in q labOratory using liquid carbon diOXide,
from which soda water is made, sealed in \
thick glass tube and heating it slowly to 80
degrees Fahrenheit, when the whole of the
liquid suddenly changes into gas The APP
plica ton of this principle to water is the
basis of the Benson generator, which Is de-
scribed by Chemistry and Industry here
as follows:
I'm the Benson generator water is con-
verted into steam at the critical tempera-
ture of 706 degrees Fahrenheit, that is the
whole mass of the water in the coils is
bodily changed into steam at the same vol
ume without the absorption of any latent
heat, since the volume remains the same.
1t will be obvious that as no latent heat is
absorbed there is no ebullition or boiling, -
that is, the sudden conversion of small parti-
cles of water in comparatively large bub-
bles of steam. the energy required for this
increase in volume constituting the latent,
or lost heat
1T is on these highly ingenious lines that
the essential trouble of the small-bore coil
steam-g generator has been overcome, the fact
that because of the absorption of latent heat
and consequent boiling the water will not
remain in contact with the sides of the
tube, and the generation of steam is spas
modic and apt to be explosive. The gem
GRAFTON of steam at the critical temperature
has, of course, completely eliminated this
difficulty that narrow-bore steel coils can
be used which will withstand almost any
pressure; in fact, the present installation is
/ said to have been tested automatically to
6,400 pound pressure.
The actual installation at Rugby, which
is only one of number of different arrange
ments possible, consists of generator coils of
| q Inch steel tube, 4 inch thick, placed 10
a height of feet, round an inner vertical
cylinder of friedrich. This is surrounded
! by an outer casing and a superheater, con-
face was stern and set his voice cold and
his lips were drawn into a straight line.
And if l may ask" Mrs. Breen was say
ing dryly, what is this work Anthony?
Now that the cat is out of the bag, l sup
pose l am entitled to know. Are you a
stenographer, my dear. perhaps a mani
curst. or a department store clerk"
Miriam drew long breath. She felt sud
denly as If the restraint that had held her
all evening had dropped from her, and she
was free at last.
II design dresses for the firm of Carson
& Holland, Mrs Breen. l not ashamed
Of it, and it was wrong to keep it from you.
| There is no reason why you should not
| know"
| Her young eyes looked directly into the
/ old ones opposite. and it was Mrs. Breen
who first looked away, but she never after
! Tuesday, Temporary REIMBURSEMENT
and suspicion"
ward forgot that fact as Miriam was to
| realize later.