IMPROVEMENTS IN GAS ENGINES
Year: 1883

page_text: LETTERS PATENT to Charles Max Sombart, of the firm of Buss Sombart and
Company, Engineers, of Magdeburg in the Empire of Germany-for an
Invention of "IMPROVEMENTS IN GAS ENGINES"
PROVISIONAL SPECIFICATION left by the said Charles Max Sombart at
the Office of the Commissioners of Patents on the 29th December 1883.
CHARLES MAX SOMBART of the firm of Buss Sombart and Company, Engineers
of Magdeburg in the Empire of Germany "IMPROVEMENTS IN GAS ENGINES"
These Improvements relate to gas Engines which on the one hand are composed
of two working cylinders with only one gas pump and disposed in such a manner
that according to the amount of work required, either the one or the other of
the working cylinders or both together may be put into action and which on the
other hand are composed of only one motive cylinder and one gas pump.
It is a well known fact that there are many gas-engines which do not work
advantageously because they are constructed for a quantity of work which is
almost in all cases greater than that generally required.
This unfavourable working of gas engines results partly from the fact that the
consumption of gas does not decrease in proportion to the diminution of the useful
work really required and partly that the working is excessively irregular because
the engine is regulated in such a manner as to suppress several explosions one after
the other that is to say to receive a new impulsion only at each fourth sixth
or eighth revolution of the crank shaft.
In order to avoid these inconveniences under one arrangement according to this
Invention two cylinders are combined together in order to get a gas engine which
at its normal working and by using both working cylinders, receives one impulsion
at each semi-revolution of the crank shaft whilst in the event of only half or less
of the normal power being required one or the other of the cylinders can be put
out of action during working without prejudicing the combined function of the
remaining parts of the Engine-In thus working with one cylinder one explosion.
only is produced at every revolution of the crank shaft and only about half the

page_text: amount of gas required for the engine when working with both cylinders will be
consumed.
An Engine constructed according to this Invention with two working cylinders
is arranged and works as follows.
When the piston of the first motive cylinder moves forward in virtue of an
explosion of the compressed explosive mixture in the space behind the said piston
the charge of fresh air enclosed in the space in front of the said piston and
which was drawn in at the preceding stroke by way of a tube and admission
valve and an aperture in the side of the cylinder is forced through a channel
into an air chamber beneath the cross head guides The pressure which the air
sustains in this chamber is a little higher than that of the atmospheric air.
Before the piston has performed its forward stroke and when it has moved
over an exhaust opening in the cylinder the exhaust valve is opened by a lever
and cam thus permitting the residues of the explosion to escape almost instan-
taneously through the said valve because the products of the burnt gases possess
a higher pressure than that of the atmospheric air-However as soon as this
pressure becomes lower than that in the air chamber the air compressed and
enclosed in the said chamber flows into the working cylinder to the rear of the
piston by way of a tube, back-valve and channel
As the air enters the cylinder with a great velocity the remainder of the products
of combustion will thus entirely be expelled from the cylinder through the exhaust
valve which is kept open until the piston has passed the exhaust opening during
its return stroke. It will be understood that the back valve has been already
closed when such a quantity of air has passed from the air chamber to the working
cylinder that the said pressures are mutually.in a state of equilibrium.
The piston after having passed the exhaust opening on its return stroke compresses
the atmospheric air which is enclosed in the space behind the piston of the cylinder-
During the time of compression the exhaust valve is kept closed.
At the beginning of the compression of air in the explosion cylinder the piston of
the gas pump simultaneously presses gas into the working cylinder by a channel
valve and tube which before, during the forward stroke, has been drawn in from a
gas receiver through a valve and tube-By this means air and gas are at the same
time compressed and intimately mixed in the explosion cylinder.
The piston rod of the gas pump is firmly connected with the bolt of the cross
head of the piston rod of the working cylinder When the piston has reached the
end of its back stroke the compressed mixture of gas and air is ignited by the
hereinafter described iguiting apparatus or any other means suited to this purpose
as for instance by electricity.
The same operation as just described is also accomplished in the second working
cylinder with the difference that the process is performed in a reversed order at
equal intervals, the cranks being diametrically arranged at an angle of 180 degrees.
Of course the valves as well as the parts by which they are operated upon must be
disposed accordingly.
The gas pump is double acting and destined for feeding the first working cylinder
by the one side and the second working cylinder by the other side.
During the forward stroke of the piston of the gas pump the gas in the space in
front of the said piston is pressed into the combustion chamber of the second
working cylinder through tubes a channel and a valve whilst gas is drawn into the
space behind the said piston from the gas receiver through tubes and a valve
On the return stroke of the gas pump piston the volume of gas in the space
behind the gas pump piston is forced into the combustion chamber of the first working
cylinder whilst gas is sucked in at the other side of the said piston.
The igniting apparatus consists of a small cylinder with a piston which is operated
upon by a crank at the end of a shaft rotated from the crank shaft.
The bottom of the cylinder contains two small air valves and a gas valve-
The said cylinder is also provided with two clack valves one of which serves for
establishing a communication between the igniting cylinder and the working

page_text: cylinder while the other is destined for putting the outside in communication with
the igniting cylinder-The flame of a gas burner burns constantly in front of the
latter or second clack valve.
The piston on leaving the cylinder bottom draws in air and gas through the
valves At the moment when it passes over the opening of the second clack valve
the flame of the gas burner is sucked in also to ignite the mixture of air and gas in
the cylinder By virtue of the explosion thus caused the pressure in this cylinder
exceeds that in the motive-cylinder so that the ignition is propagated into the latter
through the clack valve kept closed during the compression of gas and air in the
working cylinder.
As the ignition of the mixture of gas and air in the working cylinder must take
place at the moment when the piston thereof has reached the end of its stroke it is
necessary that the piston of the igniting apparatus on moving outwards occupies
at this moment a position wherein it is just about to uncover the second clack
valve.
In the pipes which conduct the gas from the gas receiver to the two ends of the
gas pump two taps are inserted-By closing either the one or the other of them it
is rendered possible to stop either of the working cylinders the other only
remaining at work when the engine works as a single acting engine and under
the same conditions as a gas engine of only one motive cylinder and a gas pump.
The working of the gas engine with two cylinders is regulated in the following
manner.
When the engine runs above its normal speed a centrifugal governor operates
on the suction valves so as to keep them open. On the return stroke of the
pump piston the quantity of gas drawn in during the preceding stroke is pressed
back into the gas receiver through the pipes and their respective valves kept open.
When both cylinders are in action the volume of gas which is pressed back
through one or the other of the suction valves kept open is at the same time drawn
on by the other side of the piston of the pump and the reverse.
In this case the same quantity of gas is somewhat moved from the space in
front of the piston of the gas pump to the space at rear thereof (or the reverse) in
passing through the suction valves pipes and gas receiver.
Supposing one of the taps with which the pipes are provided to be closed only
one of the motive-cylinders can remain in action the volume of gas then pressed
back through the suction valve kept open into the gas receiver is compressed in
the latter and afterwards drawn again from there by the same side of the piston
of the pump during its return stroke.
The gas receiver must be so large that the pressure of the volume of gas pressed
back into it remains always much inferior to the pressure of the mixture of gas
and air in the motive cylinder securing thus a positive shutting up of the delivery
valves during the time the regulation is performed.
The mechanism for regulating the working of the engine consists as follows.-
By means of a bell crank lever the sleeve of the governor is connected with
slides which slide in the guides of the valve case These slides are provided
with projecting pieces and displaced by the action of the governor according to
the speed of the engine-When it runs too fast these projecting pieces come just
above the rod of the valves being thus kept open until the slide recedes.
It will be evident that the principle of the herein before described gas engine can
be applied to gas engines which have only one working cylinder and a gas pump
the latter being open at the one end. The other parts remaining nearly the same
as in the described engine.
In this case it would however be preferable to employ a gas pump constructed
as follows.
The piston of this pump which is also closed at both ends, is designed so as to
constitute a sucking valve at the same time-When it moves forward the quantity
of gas in the space at the front of the piston will flow through a passage of the
piston to the other side of the latter-On the return stroke the piston rod moves

page_text: firstly independently in the piston until a conical end of the rod head reposes upon
the valve seat in the opening in the piston
The moment the valve is closed the piston partakes of the motion of the
rod and the volume of gas in front of the piston is driven into the working
cylinder.
The entrance of gas takes place through a hole in the forward end of the pump
cylinder By means of a valve inserted between the motive cylinder and the gas
pump it is possible to regulate the working of the engine by subjecting the
said valve to the influence of the governor in nearly the same manner as herein-
before described.
For instance if the engine run too fast the entrance of gas into the explosion
cylinder is interrupted by causing the gas to flow through the said valve kept open
by means of a cam or angle lever joined to the governor and through a channel to
the other side of the piston-On the forward stroke the same volume of gas passes
again through the piston and so on till the valve is closed The following is a
construction of a self acting lubricator which can be employed-It contains two
partitions so that the vessel is divided in two separate compartments destined for
receiving the lubricating material-Between these partitions are arranged two
wheels made to rotate by a grooved pulley on the shaft of one of the wheels.
The two prolongated ends of the axis of the other wheel are provided with a
right and left hand screw thread respectively passing through sockets in the vessel
the said sockets having a clearance between themselves and the screws so that a
spiral channel is obtained between the sockets and the screw threads of the
extensions of the said axis-On putting the latter into rotation the lubricant
which enters the first screw threads by gravity is conveyed through the said
spiral channel to small tubes which conduct the lubrifying material to the desired
places

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles Max Sombart in the Patent Office on the 16th June
1884.
CHARLES MAX SOMBART of the firm of Buss Sombart and Company Engineers
of Magdeburg in the German Empire "IMPROVEMENTS IN GAS ENGINES
"
These Improvements relate firstly to Gas Engines which have two working
cylinders with only one Gas pump and disposed in such a manner that according
to the amount of work required either the one or the other of the working
cylinders or both together may be put into action. The said improvements also
relate to Gas Engines which have only one motive cylinder and one Gas pump.
It is a well known fact that there are many Gas Engines which do not work
advantageously because they are constructed for performing an amount of work
which is in almost all cases greater than that generally required.
This unfavourable working of Gas Engines results partly from the fact that the
consumption of Gas does not decrease in proportion to the diminution of the useful
work really required and partly from the fact that the working is excessively
irregular because the Engine is regulated in such a manner as to suppress several
explosions one after the other that is to say to receive a new impulsion only at each
fourth sixth or eighth revolution of the crank shaft.
In order to avoid these inconveniences under one arrangement according to my
Invention two Cylinders are combined together in order to obtain a Gas Engine
which at its normal working and by using both working Cylinders receives one
impulsion at each semi-revolution of the crank Shaft, whilst in the event of only
half or less of the normal power being required one or the other of the cylinders
can be put out of action during working without prejudicing the combined function
of the remaining parts of the Engine-In thus working with one cylinder one
explosion only is produced at every revolution of the crank shaft and there is
consumed only about half the amount of Gas which is required when working with
both cylinders.
A Gas Engine constructed according to my Invention is represented in the
accompanying drawings wherein Figure 1 shows a horizontal section of the Engine
with two working cylinders. Figure 14 shows a vertical section of the Engine
with only one working cylinder. Figure 2 is a longitudinal section through the
gas pump shewing also the valve case of the Engine, Figure 1. Figure 2 shews
the engine with only one cylinder in plan partly in section in combination with a
small dynamo electric machine-Figure 3 is a longitudinal section through the
motive cylinder A-Figure 3ª is a cross section through the cylinder of an engine
with only one working cylinder shewing the mechanism for regulating the
working of the Engine and also the gas inlet valve. Figure 4 is a transverse
section through the two motive-cylinders the centrifugal governor I and the valve
for the ádmission of the air. Figure 5 is a transverse section through the cross head
guides of the two cylinder engine. Figure 6 is a plan of this Engine, the valve
case O of the gas pump being shewn in horizontal section-Figure 7 is a transverse
section through the two motive cylinders shewing the exhaust valves d and d' and
valve case 0-Figure 8 is a front elevation of the engine shewing the igniting
apparatus Figure 9 shows a gas pump provided with a piston forming at the
same time a valve and so disposed as to interrupt the admittance of gas into the
motive cylinder when the engine runs too quickly-Figures 10 and 11 show the
construction of an automatic oil lubricator hereinafter described.
Gas engines constructed according to my Invention with two working cylinders,
work as follows. When the piston D of the first motive cylinder A moves forward
in consequence of an explosion of the compressed explosive mixture in the space Br

page_text: the charge of fresh air enclosed in the space C (which air was drawn in at the
preceding stroke by way of the tube fa admission valve g and the aperture 7) is
forced through the channel (f figure 4) into the air chamber M beneath the cross
head guides. The pressure which the air sustains in this Chamber is a little higher
than that of the atmospheric air.
Before the piston D has performed its forward stroke and when it has moved
over the opening d², figure 1, the exhaust valve d is opened by the lever d³ and
cam h, thus permitting the residues of the explosion to escape practically
instantaneously through the said valve d, because the products of the burnt gases
possess a higher pressure than that of the atmospheric air. However as soon as
this pressure becomes lower than that in the chamber M, the air compressed and
enclosed in the said chamber flows into the working cylinder A to the rear of the
piston by way of the tube i, back valve b, and channel e, figure 3. As the air
enters the cylinder with a great velocity the remainder of the products of
combustion will thus be expelled from the cylinder through the exhaust valve d
which is kept open until the piston D has passed the opening d² during its return
stroke. It will be understood that the back valve b, figure, 3 has been already
closed when such a quantity of air has passed from the chamber M to the working
cylinder A that the said pressures are mutually in a state of equilibrium or
nearly so.
The piston D after having passed the opening d² on its return stroke compresses
the atmospheric air which is enclosed in the space B of the cylinder A. During the
time of compression the exhaust valve d is kept closed.
At the beginning of the compression of air in the explosion cylinder the piston F
of the gas pump E simultaneously presses gas into the said cylinder by a channel 9,
valve t, and tube p, figures 2. 3. 4 and 6, which gas has during the forward stroke
been drawn in from the gas receiver T through a valve n and tube m By this
means air and gas are at the same time compressed and intimately mixed in the
explosion cylinder
The piston rod of the gas pump is firmly connected with the bolt x of the cross
head figure 1. When the piston D has reached the end of its back stroke the
compressed mixture of gas and air is ignited by the hereinafter described igniting
apparatus or by any other means suited for the purpose as for instance by
electricity Such an electrical igniting device is shewn in Figure 2A and will be
readily understood without further description.
An operation like that herein before described is also accomplished in the motive
cylinder A¹ with the difference that the process is performed in a reversed order at
equal intervals, the cranks being arranged diametrically opposite-Of course the
valves and other parts of the cylinder A¹ corresponding with those of the cylinder A
must be disposed in accordance with the position of the crank to which the piston
rod of the said cylinder is connected.
The Gas pump figure 1 is double acting and destined for feeding by the one side
the motive cylinder A. and by the other side the cylinder A¹
During the forward stroke of the piston F of the said pump the gas in the
space E is pressed into the combustion chamber B₁ of the Cylinder A through the
tube m², channel q' valve t', and tube p¹, figure 6, whilst gas is drawn into the
space E¹ from the receiver T through the tube m, valve n, and tube 8¹ Figure 2.
On the return stroke of the piston F the volume of gas in the space E¹ is forced
into the combustion chamber B of the cylinder A whilst gas is sucked in at the
other side of the said piston of the pump.
The igniting apparatus Figures 1, 2 and 3 consists in the case of each of the
working cylinders of a small cylinder or chamber H with a piston k which is
capable of sliding therein and is operated upon by a frame a² 63 moved to and fro
by the crank a at the end of the shaft G, Figures, 1 and 8, rotated from the crank
shaft.
The bottom a¹ of each cylinder H contains two small air valves c and c¹ and a
gas valve e', Figure 3, and each said cylinder H is also provided with two clack

page_text: valves one of which (b') serves for establishing a communication between the
igniting cylinder H and motive cylinder A or A' whilst the other (62) is destined
for putting the inside of the said cylinder into communication with the flame of a
gas burner which burns constantly in front of the clack valve b³.
The piston k on leaving the cylinder bottom a¹ draws in air and gas through the
valves c c and e'. At the moment the said piston passes over the opening of the
second clack valve be the flame of the gas burner is sucked in to ignite the mixture
of air and gas in the cylinder H. By virtue of the explosion thus caused the
pressure in the cylinder H exceeds that in the motive-cylinder so that the ignition
is propagated into the latter through the clack valve b² kept closed during the
compression of gas and air in the motive cylinder A or A¹.
As the ignition of the mixture of gas and air in the motive cylinders (A or A¹)
must take place at the moment when the piston (D or D¹) has reached the end of
its stroke, it is necessary that the piston of the igniting apparatus in connection
with each cylinder on moving in the direction of the arrow occupies each time at
this moment the position indicated in Figure 1.
In the pipes which conduct the gas from the gas receiver T to the two ends of
the gas pump E, two taps S and S¹ are inserted. By closing either the one or the
other of them it is rendered possible to stop either of the motive cylinders A or A¹
the other only remaining at work, so that the Engine works as a single acting engine
and under the same conditions as a gas Engine of only one motive cylinder and a
gas pump as shewn in the Figures 1° 2° and 3ª hereinafter described.
The working of the Gas Engine with two motive cylinders is regulated in the
following manner,
When the Engine runs above its normal speed the centrifugal governor I,
Figure 4, operates on the suction valves n and n³ so as to keep them open. On
the return stroke of the piston F the quantity of gas drawn in during the preceding
stroke is then pressed back into the receiver T through the respective valves, n
or n¹, kept open and through the pipes s¹ and 8².
2
When both cylinders are in action the volume of gas which is pressed back
through the suction valve, n or n¹, kept open is at the same time drawn on by the
other side of the piston F and the reverse In this case the same quantity of gas
is somewhat moved from the space E2 of the gas pump to the space E¹ (or the
reverse) in passing through the valves n and n¹, pipes 81 and 82, and receiver T.
Supposing one of the taps S and S₁ to be closed only one of the motive-cylinders
can remain in action; the volume of gas then pressed back into the receiver T
through the respective valves n or n² kept open, is compressed in the latter and
afterwards drawn again from there by the same side of the piston F during its
return stroke.
The receiver T must be so large that the pressure of the volume of gas pressed
back into it remains always much inferior to the pressure of the mixture of gas
and air in the motive-cylinder securing thus a positive shutting up of the delivery
valves t and t¹, figure 7, during the time the regulation is performed
The mechanism for regulating the working of the Engine is clearly represented
in figure 4.
By means of the bell crank lever w the sleeve of the Governor I is connected
with the slides and v' figures 2 and 4 which slide in the guides of the valve
case O-These slides are provided with projecting pieces * and displaced by the
action of the Governor according to the speed of the Engine-When it runs too
fast these projecting pieces come just above the rod of the valves which are thus
kept open until the slide v recedes
It will be evident that the principle of the bereinbefore described gas Engine
can be applied to gas Engines which have only one working cylinder and a gas
pump
The arrangement of such an Engine is illustrated in the figures 1* 2ª and 3ª It
is somewhat modified in relation to that with the two working cylinders as already
described, but all these modifications can also be applied to the former.

page_text: The fresh air is not let into the motive cylinder through a separate pipe but
through numerous holes bored in the front cover a' which is provided with an
India rubber valve-The discharge of the burnt gases is effected automatically
through the exhaust opening 2 by the rush of fresh air passing from the air
chamber M through the selfacting air valve c² into the motive cylinder thus
dispensing with the exhaust valve mechanism
The regulation of the speed or working of the engine is effected by a
governor H which operates upon the gas escape valve d by means of a bell
crank lever and rod ka-When the engine runs too fast the said valve ď* is
raised by the governor H¹ so that gas is pressed back into the gas supply as
indicated in figure 2ª.
The explosive mixture in the motive cylinder is ignited by electricity which
may be effected for instance by the arrangement shewn in figure 2ª, where F
represents a dynamo and C' an induction coil, the induced current of which sparks
at given moments across the space between two opposite metallic pieces inside the
cylinder
Instead of the gas pump as described, one could be employed if preferred as
shewn in figure 9, wherein the piston o of this pump which is also closed at both
ends is designed so as to constitute also a sucking valve. When it moves forward
the quantity of gas in the space k¹ will flow in the direction indicated by the arrow
through the passage of the piston o to the other side of the piston-On the
return stroke the rod h¹ moves firstly independently until the conical end of of the
rod end rests upon the valve seat s-The moment the valve is closed the piston o
partakes of the motion of the rod h¹ and the gas in front of the piston is driven
into the working cylinder
The entrance of the gas takes place through the hole o² When a valve p² is
inserted between the motive cylinder and the gas pump it is possible to regulate
the working of the Engine by subjecting the said valve p² to the action of the
Governor in the manner as herein before described with reference to figure 4.
: For instance if the engine run too fast the entrance of gas into the explosion
cylinder is interrupted by causing the gas to flow through the said valve p² kept
open by means of a cam or angle lever joined to the Governor and through the
channel q² to the other side of the piston o-On the forward stroke the same
volume of gas passes again through the piston o and so on until the valve p² is
closed Figures 10 and 11 show the construction of the herein before mentioned
self acting lubricator
It contains two partitions and r¹ by means of which the vessel K is divided
into two separate compartments destined for receiving the lubricating material―
Between these partitions r r¹ are arranged two wheels u and u¹ made to rotate by
the grooved pulley 'y on the shaft of the wheel u-The two prolongated ends of the
axis of the other wheel u' are provided with a right and left hand screw thread
respectively passing through sockets x and x¹ which surround them with a little
clearance so that a spiral channel is obtained between the sockets and screw threads
of the extensions of the said axis-On putting the latter into rotation the lubricant
which enters the first screw threads by gravity is conveyed through the said spiral
channel to the small tubes z and z which conduct the lubricant to the desired
places The arrangement is shewn duplicated, but it will be evident that it can be
constructed singly if desired.
Having now described and particularly ascertained the nature of my said
Invention and the manner in which the same is or may be used or carried into
effect I would observe in conclusion that what I consider to be novel and original
and therefore claim as the Invention secured to me by the hereinbefore in part
recited Letters Patent is
First The regulation of the working of a Gas engine with either one explosion
cylinder or two explosion cylinders, but with one gas pump only in such a manner
that at those times when no explosion shall occur the charge of gas in the gas
pump is caused not to enter the motive cylinder but to be conducted either to

page_text: the gas conduits or receptacles (as for instance the receiver T in figure 2) or to the
front part of the gas pump or the part behind the piston (as in figure 9) substantially
as hereinbefore described.
Second For the purpose of regulating the working of gas engines with one or
two working cylinders and one gas pump, the combination of a gas pump E with
the valve case O, figure 2, and the valves n and n¹, the latter being regulated by
a governor I by means of the bell crank lever w and slides v and v¹ provided with
projecting pieces v², substantially as herein before described and illustrated in the
accompanying drawings.
Third For the purpose of regulating gas engines with one working cylinder
and a gas pump, the combination of a gas pump with a valve piston by means of
which the gas is drawn into the pump at one side of the piston and caused to flow
through a passage in the piston to the other side thereof from whence it is passed
either into the working cylinder or is caused to return to the space at the side of
the piston where it originally entered, according to whether a valve operated by
a governor is closed or opened, substantially as and for the purpose hereinbefore
described to Figure 9 of the accompanying drawings.
Fourth In gas engines the combination of a governor H' with the bell crank
lever ³, rod k², and gas escape valve d', substantially as herein before described
with reference to Figures 14, 24, and 34 of the accompanying drawings.
Fifth A gas engine consisting of two working cylinders the cranks of which
are placed diametrically opposite to each other and of one gas pump closed at
both ends, the said engine being provided with means whereby it is capable of
working either in such a manner that at every half revolution of the crank shaft
an explosion takes place alternately in one and the other of the working cylinders
or in such a manner that the said engine can be worked with one working cylinder
only and the gas pump thus producing one explosion at each revolution of the
crank shaft, all substantially as hereinbefore described with reference to the
accompanying drawings.
Sixth The igniting device constructed as herein before described and illustrated
in figures 1, 2, and 3, combined in such a manner with the motive cylinder or
cylinders that the explosions produced in the small cylinder or chamber of the
igniting device cause at the proper time the ignition of the explosive mixture in
the motive cylinder or cylinders through the medium of a valve or valves which
remains or remain closed during the compression of the inflammable mixture in
the motive cylinder or cylinders but is or are opened by the surplus of pressure
arising from the explosion of the explosive mixture in the igniting cylinder or
chamber, substantially as herein before described.
Seventh-The self acting lubricator constructed and arranged substantially as
herein before described with reference to Figures 10 and 11 of the accompanying
drawings whether arranged singly or doubly as shewn.
Eighth The general arrangement and combination of parts constituting the
improved gas engine with two working cylinders and a gas pump herein before
described and illustrated in the accompanying drawings.
Ninth The general arrangement and combination of parts constituting the
improved gas engine with one working cylinder and a gas pump hereinbefore
described and illustrated in the accompanying drawings.
In witness whereof I the said Charles Max Sombart have to this my Specification
set my hand and seal this ninth day of June One thousand eight hundred and
eighty four,