, 1860-07-18

fr,cu Y. T. umtt Correspondent
Losnos Juns II, 1870.
Should IN enthusiastic inventor have pro-
posed 70 our conservative Bteau'enRine people,
t1elre months ago, to dispense with the iced"
pumps which keep up the water' supply IN steam
boilers; should he hare promised the accom-
pl:shment Of this all Important function oy a.
lowing simple jet of steam to dow out Of the
boiler In pne place, como ia contect with tie
feed.water, carry it through the open air, aSd
inject it into the same boiler ut another place
without the aid Of pistons, plungers Or movable
been set down aulong the self.propelliug pro-
pel!er and perpetual motion enthusiasts:
But 1t 4 time when the archives Of patent
offices we're crammed with the most hope essly
unpromisiug schemes for producing visible ef-
feels without apparent causes, it vas reserved
for French@sn By the name Of o,if1Id to &C.
tuafly accomplish The very result have first
mentioned.
The G.ifard injector consists Of brass tube,
soms twenty incnes long and three inches in d.
ameter, locomotive size,) provided with pipes
loading to the boiler and tank, and internally
with simple system Of compartments and ncz-
zles, which may be briefly described. Steam
from The boiler, regulated in torcs and quantity
BY coci. enters this tube or barrel near one
end, and issues ont Of 4 nozzle, eaJ one quarter
Of an inch in diameter, into the large end OF
another trumpstshaped nozzle OF similar size,
both these uozz!es being within the outside
barrel 6rst named. Water from the tank enters
the annulsr space left between its m 'u'h and
the point Of the frat. The water entering heso
must be under slight outside pressure, sutfi-
cient to keep up the supply until the steam
is j.. let on, and then the action OF the
steam will draw = supply from q depth Of
several feet. The steam and water, then enter
the large end Of the second nozzle together, and
the stenu,. by its force AID condemnation. car
RES the water with greater velocity out Of tha
small, end, where the jet Of water aud condeas.
ed steam jumps across space OF from to
an inch, through tbs open alr, where II all en-.
ters, without spatserin4 or escape, the small
end Of third similar nozzle. which leads II d.
rectly to the boiler. The steam il all condens-
ed. as it comes in contact with the water in the
second nozzle impartng from 60 to 1u0 degrees
of heat to the wAter before it enters tie boiler.
am not aware that Any one fully understands
the principles OF this strange phenomenon: The
force aud the condensation Of the solid It Of
steam entering the hollow jet Of water are The
only appsrent causes, as The apparatus will net
work with very hutor boiling water. There is
a check-yalse between the Last nczzle and the
boiler, So that the water in the boiler will nut
escape when the feeder is not working. There
Is also casing around the place where the
stream jumps from the second to the third
nozzle, which may be opened or closed at pleas
use, without affecting the operation Of the in-
strnment. From this casingis an overao~.pipe,
| which carries of the steal and water before
The work b,gens while it is getting started. for
| ii the instrument is entirely cold, or if the
| wateris very hot, it will not go instantly 10
work. It can be started, however, as quickly
manipulating, stopping. starting. aud generally
"fussing" with one Of them to MT hearts con
| tent, aud find it sure to work in al cases kelly
| to arise in the normal conditions Of any varie-
ties Of bai!ers and pressuns.
That this mode Of feeding is reliable and
trustwor,hy-as much SO as any models now
settled beyond question. It haa been to work
under all circumstances, in France, for two
years, and in England for ten months. Engi-
| ueers here are applying it to locomotives, sta
tionary and marine boilers, as fast as the iu-
struments can be manufactured hE Messrs.
Sharp, S ewart & Co., Of Manchester, the owners
| Of the license in this country. Jhe question OF
economy of this mode OF feeding, however, on
large boilers, is not settled. 1t is indeed pos
sible that Oh the grand scale where the economy
| Of the fuel required for the water supply is an
object, the Worthinston duplex pump, for In
stance, would be the best means. Bu: for ag-
Ticuisural engines, where trorEing parts are
especially liable to arrangement, an! at the
| same time lar away from machine shops and
operatiyes-where the amount Of extra fuel
| required is necessarily too small 10 be Of Rc-
count, where independent feed is particularly
| desirable for city cars, s!eam-car1iakts, light
| locomotives and al small uses wh+Fe these Coli
d,tious exist, the Gihard injector is likely to be
Of very DECIDED and permanent TalCe. be
sides, the instruments nre 30 simple thut tleil
cost, though now excessive tor obvious reasons
must soon be a halt or q third that OF a CON,
mon pump driven By the engines, and the
fourth or sixth Of that Of good independent
pump.
uaf1Ds the past six months several attempt:
| r.. - - ,