Year: 1897

page_text: I, THOMAS WALTER BARBER, of 17 and 18, Tothill Street, Westminster, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention consists essentially of a boiler (or vaporizer), engine & condensing
apparatus combined, which work with a closed cycle of operations.
The boiler is constructed of a coil of pipe, or other suitable tubular arrangement
& the furnace is designed to burn either coal, oil or wood fuels or gas. It is further
so constructed that, where practicable, hot water or steam may be used in place
of the fuels above mentioned.
As a motor fluid, I use preferably an oil with a low boiling point, but water or any
suitable mineral oil may be used.
The boiler is supplied from the condenser by a feed apparatus actuated from the
governor & is so controlled that only sufficient fluid is injected with each stroke
of the engine to supply sufficient vapour for a similar subsequent stroke of the
engine.
The condenser is constructed of a coil or number of pipes, around which a cooling
medium is circulated. In such cases as the adaptation of this form of motor to
motor-carriages," the condenser is arranged to permit of the circulation of air
as the cooling medium.
66
The exhaust of the engine passes to the condenser & the greater portion of the
motor-fluid is kept in the condenser to be reinjected into the boiler-as above
described in small quantities as required.
I, THOMAS WALTER BARBER, of 17 and 18, Tothill Street, Westminster, Engineer,
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 consists essentially of a boiler, engine & condensing apparatus
combined, which work with a closed cycle of operations.
I construct the boiler of a coil of pipe or other suitable arrangement of tubes,
and the furnace is designed to burn either coal, oil or wood fuels or gas, and is
[Price 8d.1

page_text: further arranged so that where suitable, either hot fluids or steam may be circulated
through it, to take the place of fuel. In the drawing herewith the boiler is shewn
with a furnace adapted for hot fluids or steam circulation. A is the coil of tubes,
B is the furnace with the circulating pipes C attached, and D is the outer casing.
The boiler may be constructed as part of the engine base, as shewn, for small power
motors; but for large engines it will be more convenient to build it separately,
retaining however its characteristics as shewn in the drawing herewith.
The boiler is supplied from the condenser E by a feed arrangement actuated from
a governor, which arrangement permits of the introduction into the boiler at each
stroke of the engine of only so much motor fluid as will provide vapour sufficient
for a subsequent stroke of the engine. In the drawing-F is the feed apparatus
which consists of a modified form of plug cock--the plug G being provided with
cavities H of a proper size-which cavities fill with motor fluid from the condenser E
and in rotation deliver the fluid into the boiler A. A governor of any ordinary
form can be used and modifies the quantity of fluid delivered to the boiler by
checking or accelerating the speed of rotation of the plug G.
In place of this feed apparatus I may use an ordinary feed pump in which the
stroke of the plunger is varied by the action of the governor. This form of feed
will be more suitable to engines of large powers.
The condenser is constructed of pipe arranged for a circulation of water or other
cooling medium and the exhaust N from the engine enters it (the condenser) direct.
The greater portion of the motor fluid is retained in the condenser and is fed into
the boiler as required.
In the drawing E is the condensing coil, enclosed in a casing I through which
casing a cooling medium circulates. The exhaust N from the engine enters at K,
into a chamber or chambers constructed as shown at L. This construction is
adopted in order to ensure a circulation of the motor fluid with the exhaust vapour
in the condenser. By securing this circulation I greatly increase the efficiency
of the condenser. In a large engine I use a separate pump to assist in this circula-
tion, because the exhaust would become subject to a high back pressure, if saddled
with this extra duty (of circulating the motor fluid in the condenser).
The engine may be of any suitable type-having regard to the duties it is designed
to perform. As shewn at M it is a single action vertical motor adapted to the
development of small powers.
In the case where this invention is adapted for use on motor carriages the con-
denser may be constructed so as to utilize the air as a cooling medium and the
boiler will be preferably constructed of a series of pipes or coils enclosed in a
refractory casing.
As a motor fluid I use preferably a hydro-carbon such as petroleum or one of
its kindred "oils," naphtha, benzene, alcohol, ammonia, and the like. These "oils"
have a low boiling point & also a low latent heat and by the use of one of them in
a motor constructed in accordance with my invention I am enabled to produce
motive power with great economy.
Having now particularly described and ascertained the nature of my said
invention & in what manner the same is to be performed, I declare that what I
claim is:-
--
1. A boiler or evaporator constructed with a furnace suitable for the circulation
of a hot fluid or vapour substantially as herein before described.
2. A feed apparatus for use in conjunction with the said boiler and consisting of
a perforated plug cock with variable speed or feed pump with variable stroke
designed to feed the boiler at a rate equivalent to the consumption of the engine,
substantially as hereinbefore described.
3. A condensing apparatus with a chamber or chambers, or a circulating pump;
constructed for inducing a circulation of the exhaust vapour and the motor fluid
together through the said apparatus, substantially as herein before described.
4. A condensing apparatus in which the whole or practically the whole of the

page_text: motor fluid is retained and also utilised for circulation with the exhaust vapour―
substantially as hereinbefore described.
5. The utilization in a closed cycle apparatus, such as is herein set forth, of
hydro-carbons-petroleum, or one of its kindred "oils;" naphtha, benzene, benzoline,
alcohol, ammonia & the like-as a motor fluid substantially as hereinbefore
described.
6. The closed cycle apparatus consisting of engine, boiler, variable feed and circu-
lating condensing apparatus, utilising hydro-carbon oils" • as motor fluids,
substantially as hereinbefore described.
7. In a closed cycle apparatus as herein set forth, the method of controlling or
governing the speed and power of the engine by modifying the quantity of feed to
the boiler, (and as a consequence the pressure in the boiler); substantially as herein-
before described.