Year: 1888

page_text: I, GEORGE WILLIAM GARRETT, of Denzil Avenue, Southampton, Submarine
Engineer, do hereby declare the nature of this invention to be as follows:-
The object of this invention is the using of low pressure boilers or steam generators
in connection with highly expansive engines or motors. It will also be found of
great advantage in submarine boats, tramways &c. where heat magazined in super-
heated water is the power used to produce motion since the pressure can be kept up
in the motor for a longer period; or in other words, a greater part of the heat
magazined in the superheated water can be made use of by the motor.
For the purpose of this invention, I employ a vessel resembling an ordinary surface
condenser as used to produce the vacuum in marine engines, with the difference that,
instead of the cold water which is caused to pass through the tubes of a condenser,
steam or hot water or other liquid, which has been heated in any ordinary boiler or
steam generator, is caused to circulate; and so the surface, which in the condenser
is called cooling surface, would correspond with the heating surface of my vapour
generator.
In contact with the heating surface either in the liquid state or in the form of
spray is placed some substance having a lower boiling point and lower specific heat
than the water or other liquid which is circulating through the tubes, for instance
one of the volatile oils of Petroleum.
Such substance or oil by extracting heat from the heating surface of the
"Generator" would become a vapour having a greater tension than the steam,
water, or other heating medium at the same temperature.
This vapour of oil of petroleum, or other suitable substance can be used to
produce motion in an ordinary expansive steam engine or other suitable motor.

page_text: The invention therefore consists in using water or other suitable liquid to absorb
the heat produced by combustion of fuel and using this heat in the engine or motor
through the medium of another substance such as a volatile oil of petroleum which
has a lower boiling point than water or in other words whose vapour tension is
greater than the tension of aqueous vapour or steam.
COMPLETE SPECIFICATION.
Improved Means and Apparatus for Generating Vapour for Use in
Vapour Engines.
1 GEORGE WILLIAM GARRETT of Denzil Avenue, Southampton, Submarine
Engineer, do hereby declare the nature of my said invention and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement
:-
The object of this invention is the using of Low pressure boilers or Steam
Generators in connection with highly Expansive Engines or Motors. It will also
be found of great advantage in Submarine boats, Tramways etc. where heat magazined
in superheated water is the power used to produce motion since the pressure can be
kept up in the motor for a longer period or in other words a greater part of the
heat magazined in the superheated water can be made use of by the Motor.
For the purpose of this invention I employ a vessel A, see Figures 1 and 2 of the
annexed drawings resembling an ordinary surface condenser as used to produce the
vacuum in Marine Engines with the difference that instead of the cold water which
is caused to pass through the tubes of a condenser, Steam or Hot water or other
liquid which has been heated in any ordinary boiler or steam generator such as at B
is caused to circulate by the pipes CC and so the surface which in the condensor
is called cooling Surface would correspond with the heating surface of my vapour
generator.
In contact with the heating surface either in the liquid state or in the form of
spray is placed some substance having a lower boiling point and lower specific heat
than the water or other liquid which is circulating' through or around the tubes, D, D,
for instance petroleum.

page_text: Such substance or oil by extracting heat from the heating surface of the
"Generator" would become a vapour having a greater tension than the steam, water
or other heating medium at the same temperature.
This vapour of petroleum, or other suitable substance can be used to produce
Dotion in an ordinary expansion steam engine or other suitable motor.
The invention therefore consists in using water or other suitable liquid to absorb
the heat produced by combustion of fuel and using this heat in the engine or motor
through the medium of another substance such as petroleum which has a lower
boiling point than water or in other words whose vapour tension is greater at the
same temperature than the tension of aqueous vapour or steam.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
The employment of water or other suitable liquid to absorb the heat produced by
combustion of fuel and using this heat in the Engine or Motor through the medium
of another substance such as petroleum which has a lower boiling point than water
as hereinbefore described, and substantially by the apparatus shown in the annexed
drawings.