The Hawaiian gazette. [volume] (Honolulu [Oahu, Hawaii]) 1865-1918, 1911-07-18
Invention WILL.
SAVE MUCH
COAL
Pacific Mail Engineer Is
Granted Patent on
Device.
GREAT SAVING MADE
Superheated Steam Is
Basis for Important
Discovery.
GREAT SAVING MADE

the steamship Manchuria from 172 tons
per day, the amount burned when put
into commission, to 116 tons per day
on the present homeward voyage from
Hongkong, is the feat of Chief Engi-
neer William L. Bunker, of the big
liner, through an invention which has
untold possibilities.
Chief Bunker has invented process
of relocating the exhaust steam from
piston engines, after it leaves the cylin-
ders, by means of superheated steam,
with result that, if the apparatus be
installed on the six steamers of the
Pacific Mail Company plying across the
Pacific, there will be n saving in the
frel bill of Mt least ten thousand dol
lars a month.
Attorney M. f. Prosser of this city,
has secured a patent for Chief Engi-
neer Bunker on his invention, and after
the Manchuria locked Saturday after
noon he told the seafaring man of his
good luck in having the patent grant
ed by the United States Patent Office.
Comprehensive Patent.
The patent issued is most compre-
hensive. 1t is entitled, "Means for
Treating Exhaust Steam in Piston En-
gines,' and was issued ON june &c.
So comprehensive that it covers all
piston engines, is this patent. and no
one can treat exhaust steam in a sta
tionary, locomotive or marine engine
in this way without infringing upon
the patent issued to Chief Bunker.
The problem of saving fuel has al
LII - -. L.,
was an assistant, and he made up his
mind that when he became chief in an
engine room he would make some ex-
periments along that line.
For two years he has been expert
menting, and for the last three trips
the superheater has been in use on the
Manchuria in practically the same form.
At first the inventor called the ap.
paratus the Sunshine Steam Super
heater and Reevaporater,' to be ap,
piled to compound and multiple expan,
sion engines. to reevaporate moisture
in exhaust steam; to prevent condensa.
tion in receivers; and reheat steam in
exhaust passages.
What It All Is.
The superheater consists of coils Of
wrought-iron pipe placed inside at the
top of the combustion chamber in
Scotch and water tube boilers. II
takes steam direct from the boiler, ol
lowest place ON steam pipe, and super
heats it by gases on the way to tbs
stack and discharges the superheatej
steam through the re-evaporatOr inside
of the exhaust casing ON the engine.
Re-evaporator consists of stee
nozzle, attached to the superheate6
steam pipe, and is so constructed tina
Jets of superheated steam are broker
up by impact with each other on leav
ing the nozzle. The nozzle is aimed +,
reduce wearing effect of steam i'm
pinging against opposing walls of re
ceivers or steam pipes, and to create Z
mixing effect of superheated ant
saturated or exhaust 81 cam.
Briefly explained by Engineer Bunke
the condition is that the exha1s
steam from the cylinders is PARTIAL,
condensed AMI small drops of waite
form in thu exhaust pipe after the pis
ton has driven the steam from tn
cylinders.
Superheated Steam.
The s1perheated steam is injecte
into these pipes at a temperature 0
$50 degrees. This extreme heat trans
formed the Condensed water in tn
pipes back into high pressure steam an
capable of doing further work, whic
it does on the next stage of its jour
ney.
''Ib is simple proposition" sal
Engineer Bunker in telling of his IL
vention yesterday in his cabin on boar
the liner.
"There are no books on superheate
steam, however, for it is practically a
unknown quantity, and have had I
make my own experiments.
1.-THE superheater can be used 0
any compound or piston engine, b.
there is danger of getting the steal
too hot and then il win warp thing
generally,
f'Great care must be taken in nSin
Il, but 80 far have been able 70 WOF
II out satisfactorily although there o.
many improvements which can be mad
yeti
ia Great Saving
Tho Inventor l. extremely Teileei
about bis work aHd says that Il isn
mleh ~ . discovery, bat when n
realized that ~ nse " bic appaIatl
coal consumption can bs ent AZ lea
cen peF eent. a shows up ~ gre
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