In the pi’esent case, however, the controlling
engine not designed nor adapted per
form other work than the regulation the 125
period the other, and moreover en
gine defined character which has the capa
bility oscillating movement constant
period.
The exhaust ports howevei’, constitute the
inlet ports the cylinders and the ex- 10c
haust the latter effected through the
,ports which are controlled the pis
tons and respectively. such engine that just above de
scribed the normal pressure will produce a
stroke determined length, which may be
increased diminished according the in-
50 crease pressure above the reduction of
pressure below the normal and due allowance
is made constructing the engine for va
riation the length sti’oke. The inlet port
for the admission the steam the control
ling engine similar that Fig. The special construction this de
vice may varied considerably, but de-
5 sirable that all the ports, and more particu
larly, the exhaust ports made larger than
is usually done, that force due the ac
tion the steam compressed air the
chambers will tend retard accelerate the
i movement the piston either direction.
If steam gas under pressure admit
ted through the port either side the
piston b,the latter, will understood, may
be maintained reciprocation, and free to
25 move, the sense that its movement either
direction ceases only when the force tending
to impel and the momentum which has
acquired are counterbalanced the increas
ing pressure the steam that end the
30 cylinder toward which moving, and in
its movement the piston has shut offat given
point, the pressure that impelled and estab
lished the pressure that tends return it, is
then impelled the opposite direction, and
35 this action continued long the requi-. the figure have shown two cyl
inders placed end end with piston
B and each. The combination with the cylinder and
reciprocating piston and controlling valve of
an engine adapted operated steam
or gas under pressure independently
. much
more perfect regulation and uniformity ac- no
tion secured, while the engine simple
and its weight fora given capacity very
greatly induced. The movements of
the piston compress and rarefy the air the
cylinder opposite ends the same alter
nately, and this results the heating the
40 cylindei'. this case the piston the
controlling engine constitutes the slide valve
of the main engine, that the latter may be
considered operated the exhaust the 90
former.
What claim is— 130
1. 1.6. will serve an
illustration.
An engine the kind described possesses
many and important advantages. The cylinder with
out ports any kind and air-tight except
that leakage may occur around the piston rod
which does not require very close fitting,
20 and constitutes ordinary form air spring.
In. Since the only work which the
small engine has perform the reciproca- 75
tion the valve attached the piston rod,
its load substantially uniform and its pe
riod reason its construction will con
stant.
The piston secured rod which ex
tends through the cylinder heads, the lower
end carrying the slide valve above described
and the upper end having secured a
15 plungery cylinder fixed the cylinder
a and line with it. The reciprocating move
ment the piston may converted, the
ordinary mechanisms into rotary motion 115
it may utilized and applied any other
manner desired, either directly indirectly.
site pressure applied. The cylinder the con
trolling engine formed the casing
intermediate the two main cylinders but 95
allotheressentialrespectstheconstruction and
mode opei’ation ofthe controllingengine re
mains described connection with Fig.517,900
municate through openings the same with
the cylinder chambers opposite sides the
piston.
The control the main engine the en
gine constant period may effected 85
other ways—of which Fig. and 105
indicated the dotted cii’cle the center
of the piston.very wide limits by
properly proportioning these factors, by
varying the dimensions the air chamber
which maybe equivalent varying the rigid
ity the spring, adjusting the weight 70
of the moving parts. The rate or
period reciprocation the piston, however,
55 more dependent upon the pressure ap
plied drive it, than would the period of
oscillation pendulum permanently main
tained vibration, upon the foi-ce which pe
riodically impels it, the effect variations in
60 such force being merely produce corre
sponding variations the length Stroke or
amplitude vibration respectively. Whatever may the load the
main engine therefore the steam admitted 80
to the cylinder defined intervals, and thus
any tendency change the period of
vibration the main engine overcome. The pe
riod mainly determined the rigidity of
the air spring and the inertia the moving
65 system and may therefore secure any pe
riod oscillation within.
In another application even date here
with have shown and described two recip
rocating engines combined such manner 120
that the movement operation one de
pendent upon and controlled the other. But since variation the tem-
perature the air the chamber would af
fect the rigidity the air spring, maintain
the temperature uniform surrounding
the cylinder with jacket which open
45 the air and filled with water. This latter readily
accomplished making provision for the at
tachment the piston rod one more
weights h'
