Improvements in Obtaining Motive Power by Means of Steam.
Year: 1893

page_text: Date of Application, 31st Oct., 1893
Complete Specification Left, 30th Aug., 1894--Accepted, 31st Jan., 1895
PROVISIONAL SPECIFICATION.
Improvements in Obtaining Motive Power by Means of Steam.
We, SAMUEL CHATWOOD, of 76 Newgate Street, in the City of London,
Bankers' Engineer, and SAMUEL RAWSTHRONE CHATWOOD of The Lancashire
Safe and Lock Works, Bolton, in the County of Lancaster, Manager, do hereby
declare the nature of this invention to be as follows: -
This invention has for its object improvements in obtaining motive power by
means of steam.
For this purpose we take superheated steam obtained in any way, as by passing
steam through a superheater. We pass this steam through a steam engine causing
it to do work at the expense of the heat which it contains the steam being
expanded largely in its passage through the engine. The exhaust steam which is
of low pressure and temperature but uncondensed we cause to be compressed by a
pump or by like means and driven back into the generator. Thus we retain the
latent heat which the steam contains in place of allowing it to escape with the
steam as in a non-condensing engine or with the water which in condensing engines
is passed through the condenser.
Dated this 30th day of October 1893.
SAMUEL CHATWOOD.
SAML. R. CHATWOOD.
Improvements in Obtaining Motive Power by Means of Steam.
We, SAMUEL CHATWOOD, of 76 Newgate Street, in the City of London,
Bankers' Engineer, and SAMUEL RAWSTHRONE CHATWOOD, of The Lancashire
Safe and Lock Works, Bolton, in the County of Lancaster, Manager, do hereby
declare the nature of this invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement :-
This invention has for its object improvements in obtaining motive power by
means of stearn.
:
For this purpose we take superheated steam obtained in any way, as by passing
steam through a superheater. We pass this steam through a steam engine causing
it to do work at the expense of the heat which it contains the steam being
expanded largely in its passage through the engine. The exhaust steam which is
of low pressure and temperature but uncondensed we cause to be compressed by a
pump or by like means and driven back into the generator or source.
retain the latent heat which the steam contains in place of allowing it to escape
with the steam as in a non-condensing engine or with the water which in condensing
engines is passed throngh the condenser.
Thus we
Figure 1 of the annexed drawing is a sectional elevation and Figure 2 is a plan
of a combination of apparatus for obtaining motive power in accordance with our
invention.

page_text: A is a steam generator, B is a superheater or reheater, C is a steam engine and
D is a pump or compressor.
The steam from the generator passes through externally heated pipes in the
superheater or reheater and it is then admitted to the engine; it drives the engine
and the exhaust steam from the engine is compressed by the pump or compressor
into the return pipe E. The pipe E communicates both with the generator and
the superheater or reheater so that the steam can return to the generator or source
and afterwards again pass to the engine. The engine is represented in the drawing
as driving the pump by means of an intermediate shaft and driving belts and
similarly it may drive other shafting in order to perform the work required of it;
but these and other details may be varied without departing from the invention and
the superheater may in some cases be so arranged that the added heat increases the
pressure of the steam.
A separate pump is not necessary in all cases; when the fly wheel is sufficiently
heavy and the exhaust valves suitably arranged the piston of the engine itself
will act as a pump and discharge the exhaust steam into the superheater or
reheater.
In engines with several expansions the steam may be reheated after leaving one
cylinder before entering the next.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
Obtaining motive power by means of a combination of apparatus consisting of a
steam generator, a superheater or reheater, a motor engine and a pump or com-
pressor (either separate from the engine or otherwise) the whole so arranged and
operating that superheated steam having passed through the engine is returned to
the generator or source substantially as described.
Dated this 27th day of August 1894.
SAMUEL CHATWOOD.
SAML. R. CHATWOOD.