IMPROVEMENTS IN GAS ENGINES
Year: 1884

page_text: I, GEORGE CAMERON DOUGLAS St Mary's Terrace, Pleasance, Dundee Assistant
Engineer Douglas Foundry, Dundee, do hereby declare the nature of my invention
for IMPROVEMENTS IN GAS ENGINES, to be as follows:-
While the explosive mixture of gas and air is being ignited in the Motor Cylinder
of Gas Engine I propose to pump in air to said Motor Cylinder by means of a
pump and suitable valves until said pump has completed its stroke; the radiation
of heat from said Motor Cylinder being retarded by suitable clothing. By this
means the heat rendered latent by disociating the gases within the Motor Cylinder
will be made available to raise the temperature of the air which is being pumped
in by Pump to said Motor Cylinder. By adjusting the volume of air pumped into
Motor Cylinder the mean temperature within said Motor Cylinder, may be kept
within working limits and there will be no necessity of cooling the Motor Cylinder:
by abstraction of heat through sides of Motor Cylinder which heat will be made
available to increase the power of said Gas Engine.

page_text: I GEORGE CAMERON DOUGLAS St Mary's Terrace Pleasance Dundee Assistant
Engineer Douglas Foundry, Dundee, do hereby declare the nature of my invention
for IMPROVEMENTS IN GAS ENGINES and in what inanner the same is to bo
-performed, to be particularly described and ascertained in and by the following
statement:-
While the explosive mixture, of gas and air is being ignited, in the Motor
Cylinder of Gas Engine, I propose to pump in air, to said Motor Cylinder by means
of a Pump and suitable valves; until said Pump has completed its stroke; the
radiation of heat-from-said-Motor-Cylinder-being-retarded-by-suitable-clothing.
By this means, the heat rendered latent, by disociating the gases within-the-Motor-
Cylinder, will be made available, to raise the temperature of the air which is being
pumped in by Pump to said Motor Cylinder. By adjusting the volume of air
pumped into Motor Cylinder, the mean temperature within said Motor Cylinder,
may be kept within working limits, and there will be no necessity of cooling the
Motor Cylinder; by abstraction of heat through sides of Motor Cylinder, which
-heat will be made available,-to-increase-the-power of said Gas Engine..
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Fig. 1. represents a transverse horizontal section of a cylindrical valve, together
with the motor cylinder and pump of a gas engine; and Fig. 2. is a diagram
showing the relative positions and motions, of the valve, motor and pump pistons.
A is the motor cylinder; B the inlet, for the mixture of the gas and air; C the
exhaust port; D the motor piston; E the communication ports, between motor
cylinder A and annular space F. G is the cylindrical valve, having grooves with
rings H fitted therein. I is inlet port; by which air enters into annular space K
and thence, into pump cylinder L through ports M. N is pump piston and
O cominunication ports, from pump cylinder L to annular space F. The motor
and pump cylinders, are covered with a non-conducting substanco; to prevent
radiation of heat. The valve cylinder P, and the valve G, aro open right through
longitudinal axis, so that they may be kept cool.
The action is as follows:-
Referring to Fig. 2.
The direction of revolution, is shown by arrow,
1 Motor piston D at in end of stroke; just at the moment ignition of mixture of
gas and air takes place.
1, Position of pump piston N, when valve opens.
111 Valve G commencing to open, and let air from pump L, into motor
cylinder A.
2 Position of motor piston, when pump stops forcing air into motor cylinder.
2, Position of pump piston, when stopped forcing air, into motor cylinder.
211 Position of valve, when shutting off admission of air, into motor cylinder.
7 Position of motor piston, when products of combustion commence to exhaust,
from motor cylinder.

page_text: 6 Position of motor piston, when admission of air, from atmosphere, into pump
stops.
6₁ Position of pump piston, when admission of air from atmosphere, into pump
stops.
6 Position of valve, when admission of air from atmosphere into pump, stops.
4 Position of motor piston, when valve closes communication, between pump and
motor cylinder.
4 Position of pump piston, when valve closes communication between pump
and motor cylinder.
4 Position of valve, when communication between pump and motor cylinder,
is closed. Pump piston and motor piston, are both compressing air; and gas and
air, respectively.
5 Position of motor piston, when pump communicates with atmosphere.
5 Position of pump piston, when pump communicates with atmosphere.
5₁₁ Position of valve, when pump communicates with atmosphere.
3 Position of motor piston, when valve opens communication, between pump and
motor cylinder.
3, Position of pump, when valve opens communication, between pump and motor
cylinder.
3 Position of valve, when communication opens, between pump and motor
cylinder.
Having now particularly described and ascertained, the nature of my said
Invention; and, in what manner the same is to be performed, I would have it
understood; that I do not limit myself, to the exact details, or configuration of the
parts, I have explained and shewn, as the same, may of course be varied or
modified; without in any way departing from my Invention, I declare that what
I claim is
The application, of the introduction of air, into the motor cylinder of gas engine,
while combustion is taking place therein, for the purpose of using the latent heat,
of the disociated gases to heat said air, and thus increase efficiency of gas engine,
as hereinbefore described.