Bozeman avant courier. [volume] (Bozeman, Mont.) 1872-1882, 1879-02-20
Improved Steam Eagine.

I'm making s-slEn motors Of al kinds
the tendency has t<e. o. late 10 cccr-tr-:e
engines with ! Liya .>toa sr.ee-i. BIZ
high initial >g@-ti in the mo-o- rllch o
the gearing ne--iei ID cbtSgirl s-ee~l IN n,
m4'fiinery that il moves Is dispensed with
The steam i More thoroughly employed
and The Size and weight ot the engine for
( given power are ret,s1-l. Tie most I'M
portan- Improvement in THIS direction has
sprung from rahsl ehznge in the coa-
stFlci.oa OF the steam cvlin Ter and is
moving par-s. The cylinder i Increased
n length AMI - IcS-l il diameter. and in
p--ce OF one tae.8 aze two pissoas. de
signed to nlsve in oppose directions. TIE
first piston has nd passing through The
center OF the second. and the second piston
has TWO rods. Each piston has is pi.,a1-
nd connected with crank on ! tl4-ee-
throw crank shaft. TteS4 era Is an
placed opposite ,e-ch other. lie single rod
OF one piston h-la-N.-- lie two OF the
other. / VII h deserved thar. bv Til,
change Z .ls construction Of the sagiue
the TEs.@-. Elust travel in opposite jire,-
lions each mixing : to-and-fro excursion
over i-ll the leii--.h OF TIE cylinder. For
--Sta7ce: L the two ;Jisco1S are eaca a.
one end q the cylinder. the steam nav t.e
admitted behind them both. AMI thus
drive them ,ortsser. Wren thew me-, ar
the center. the steam enters 1T = central
port and drives them apart till they reach
their original position when tie excursion
is finished AMI one revolution of the crank
i accomplished. Il ne e.f.,t Of this dispo-
sitioa Of the moving parts i 10 create
perfect balance in 5ile rec;rrs>atin- acton
OF the engine. The pull Of one piston
balances tire thrust O: the Other. Its no
longer a series Of pulls a1l r'ir7i<ts. a in
the ordinary engine. buc resulting motion
o. the combined pull md thrust Of the
two pistoaS. The advantages obtained BIZ
this bailndfe OF ne pis-ons S-a found in
the reduced l-=n 9Th ard weight o; the coz
lecting rotls AMI ths hsi-p Plate Of the Ell
zine, StealineSs OF motion. as there * no
pull or thrust OF Tie shaft xld irs bearings. :
higher speed AMI greatly increased DOW
:. A there Is no sir4ining between the
y linde-s and the shaft the engine rests
e-JEely On IL tel. AZ the two p!stons
ravel over one-balf Of the length Of the
yLnier II the s,line time. and IS the ana
i the piston surface is double that of q
IL g!c-piston engine the power is more
han doubled for given speed. The
Train caused By the expansion of the
team between ;hs piston and he end of
ne erlinier. Is he ordinary engine, in
ne balanced eass-e Is spent OF the two
nds Of the cylinder in one-haff of the 9
,roke. and hatwe> / the two pistons in the !
tier half. In either case the strains are +
1actly balanced. Thus the engine NAV
IN at high speei without producing a
Earring or shaking of the mo-
Y. In the marine work If is thought the
danced engine viii prove advantageous.
i may he driven II high speed with :.
1t sirrkins' the shin. anl by giving the
lgine higher speed. a screw OF more
iectiTe pitch ray he employed. The
MY disadvantages found in this form of
otor lie in the multiplication Of the con-
ecting-ro1s and : fling-boxes. but these :
fleets are more than balanced BIZ the
eatiness and ns-easei 4eetaSl poxerl
the engine.