L The combination with cylinder and a
piston adapted reciprocated steam
or gas under pressure cylinder and a
20 plunger therein reciprocated the piston
and constituting with its cylinder air
spring, and open jacket receptacle
around the said cylinder and containing wa
ter preserve the temperature the air
spring uniform, set forth.517,900 S
controlled engine constant period operat
ing the said valve, described.
.
Witnesses:
A rthur Smith,
Ernest Hopkinson. The combination with cylinder, re
ciprocating piston and valve mechanism for
controlling the admission and exhaust the
steam gas under pressure, cylinder, a
piston connected with and operating said 30
valve mechanism, and air spring vibrated
by the piston, the spring and piston being
related substantially the manner described
to produce reciprocating movement con
stant period.
3. 25
5.
NIKOLA TESLA.
2. The combination engine cylinder,
a piston adapted reciprocate therein, a
5 slide valve for controlling the admission of
steam said cylinder, and independently
controlled engine constant period opera
tively connected with said valve. The combination with the cylinder, pis-
i ton and valve mechanism main work
ing engine, independent controlling
engine comprising cylinder, piston con
nected with'the valve mechanism the main
engine, and spring acting upon the said
15 piston and controlling the period its recip
rocation, set forth
