Improved Means for Maintaining Approximately Constant the Quantity of Water in Steam-generators, and for Regulating the Heat applied thereto.
Year: 1896

page_text: Date of Application, 30th Nov., 1896
Complete Specification Left, 30th Aug., 1897-Accepted, 20th Nov., 1897
Improved Means for Maintaining Approximately Constant the
Quantity of Water in Steam-generators, and for Regulating the
Heat applied thereto.
I, JOHN SMITH, of Upton Villa, Penge, in the County of Surrey, Engineer, do
hereby declare the nature of this invention to be as follows:-
My invention has for its main object to maintain the quantity of water in
steam-generators approximately constant by the automatic regulation of the feed-
water supply, so that water-tube boilers and other steam-generators can be worked
with safety without the necessity for constantly or frequently observing the
height of the water-level therein.
My said invention moreover, comprises the provision for automatically regu-
lating not only the supply of water to a steam boiler, but also, in some cases, the
heat applied thereto, so that, when the amount of water contained in the boiler
is greater than the normal quantity, the water-supply will be diminshed' or cut
off and the amount of heat applied to the generator will be increased, for example,
by augmenting the supply of gaseous or liquid fuel or by increasing the supply
of air to the furnace; and, when the water in the boiler is less than the normal
quantity, the water-supply will be turned on or increased and the amount of
heat applied to the boiler will be diminished. This arr. ngement is advantageous
in cases where the water is evaporated in the boiler as it is pumped into or other-
wise supplied to the same.
According to my improved method, the feed-water supply is automatically con-
trolled by variations of pressure in a regulating tube, which is arranged in
contact or in metallic connection with a tubular or other part of the boiler in
such a manner that, should the water descend below the normal level, this tubular
or other part of the boiler will be more highly heated, and its heat being rapidly
conducted or transmitted to the said regulating tube, pressure will be produced
in such regulating tube by the conversion of some of the liquid which it contains
into steam, which pressure will act upon a piston or plunger connected with a
regulating or controlling valve on the feed-pipe. The said regulating tube is,
in some instances, so arranged that the heat of the furnace will act upon it as
well as upon the tubular or other part with which it is contact or in metallic
connection.
For example, in applying my improvements to a water-tube boiler, I provide
the steam-drum or receiver with an external tube or chamber in communication
with the said drum or receiver both below and above the normal water-level, ond
which forms a lateral extension of the steam-drum, so that, when the water

page_text: descends below the lower end or part of such tube or chamber, the latter being
exposed to the heat of the fire will have its temperature rapidly raised, since it
will then contain only steam; and when the water rises in the said tube or
chamber, the temperature of the latter will be brought down. I employ a regulat-
ing tube, which I braze for a suitable part of its length to the said tube or chamber
so that the heat will be rapidly conducted from one to the other. I prefer to
conduct the regulating tube through the side and end or ends of the steam-drum
or receiver so that only the part of the said tube in metallic connection with the
tubular or other extension of the steam-drum will be superheated when the water-
level descends. Or I can otherwise protect or cover the other parts of the regu-
lating tube to prevent their exposure to the fire. One end of the regulating tube
I connect to a cylinder beneath a piston fitted therein, which piston is connected
with a slide or other valve for regulating or controlling the flow of water into the
boiler, and is acted upon by a suitable spring or weighted lever. The other end
of the said regulating tube is closed by a suitable plug or by means of a cock or
valve.
To permit the supply of feed-water to the boiler when the fire is out or low, I
provide a by-pass around the said regulating or controlling valve, and I provide a
cock or valve in such by-pass for closing the same when necessary. I also provide
a feed-check-valve as usual on the boiler.
To permit of recharging the regulating tube with water when required, I some.
times connect a suitable pump with the said tube, preferably near the aforesaid
cylinder. By opening the cock or valve on the other end of the said tube, then
forcing in water by means of the said pump and then closing the said cock or
valve, the regulating tube can be recharged while the boiler is under steam.
The normal water-level in the boiler can be varied as desired by adjusting the
said spring or weighted lever and thus varying the pressure which has to be over-
come in raising the said piston.
In some cases, I also connect the said piston with a cock or valve for regulating
or controlling the supply of gaseous or liquid fuel or with a device for operating a
damper or otherwise varying the heat applied to the boiler, so that the heat thus
applied will be diminished simultaneously with any increase in the supply of
feed-water, or increased simultaneously with any diminution of the supply of
feed-water. This arrangement is advantageous for use with steam generators
consisting of one or more generating tubes in metallic connection throughout
approximately their entire length with a regulating tube containing water or
other liquid and connected to or forming a part of a regulator adapted to be
actuated by steam-pressure.
In applying my improvements to a Cornish or a Lancashire boiler, I sometimes
provide the same with a bent or U-shaped tube in one of the side flues, in com-
munication with the interior of the boiler both below and above the normal water-
level, the lower limb of the said bent tube being preferably lagged or otherwise
protected more or less from the heat of the products of combustion. And I carry
the regulating tube into the said flue through the brickwork or other setting of
the boiler, and braze a portion of this tube to the aforesaid tube forming the
lateral extension of the boiler.
I sometimes arrange my regulator-tube in combination with the furnace-crown
or other part of a boiler which is liable to be overheated by reason of undue low-
ness of the water-level, in which case I braze or otherwise secure a portion of the
said tube to such furnace-crown or other part of the boiler. And I connect the
said tube with means for regulating or controlling the feed-water supply, or for
operating an indicator or a damper, or for sounding an alarm.
n
LT
2011 dow of Varamban 1906
D. YOUNG & Co.,
11 and 12 Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: Improved Means for Maintaining Approximately Constant the
Quantity of Water in Steam-generators, and for Regulating the
Heat applied thereto.
I, JOHN SMITH, of Upton Villa, Penge, in the County of Surrey, 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:-
My invention has for its main object to provide for the automatic regulation or
control of the supply of feed-water to water-tube boilers and other steam
generators so that such generators can be worked with safety without the
necessity for constantly or frequently observing the height of the water-level
therein.
This regulation or control is effected by means of a suitable device for regulat-
ing the supply of feed-water to the boiler, actuated by varying steam-pressures
generated in an independent tube thermally connected with the exterior of any
suitable part of the boiler, the said tube, hereinafter termed the regulator tube,
being so arranged that the flame or heating gases will act thereon either directly
or through the medium of one or more of the generating tubes or chambers.
My said invention, moreover, comprises the provision for automatically regu-
lating not only the supply of feed-water to steam-boilers but also the heat applied
thereto, so that, when the amount of water contained in the boiler is greater than
the normal quantity, the supply of water will be diminished, and when the water
in the boiler is less than the normal quantity, the supply of water will be increased
and should the supply of water to the boiler be insufficient or from any cause
fail or stop, the supply of heat to the boiler will be diminished, for example, by
reducing the supply of liquid or gaseous fuel or the supply of air to the furnace.
That is to say, I prefer that the water supply shall be reduced or increased to a
greater degree than the supply of heat, and in some cases, that the regulation for
the supply of heat shall not take place until the whole possible regulation of the
supply of water has been effected. My said invention is very advantageous in
cases where the water is evaporated in the boiler as it is pumped into or
otherwise supplied to the same.
According to one method the feed-water supply is automatically regulated or
controlled by variations of steam pressure in a regulator tube containing water,
which is arranged in contact or in metallic connection with a tubular or other part
of the boiler in such a manner that, should the water descend below the normal
level, this tubular or other part of the boiler will be more highly heated, and its
heat being rapidly conducted or transmitted to the said regulator tube, pressure
will be produced in such regulator tube by the conversion of some of the water
which it contains into steam, which pressure will act upon a piston or plunger
connected with a regulating or controlling valve on the feed-pipe. The said
regulator tube is, in some instances, so arranged that the heat of the furnace will
act upon it as well as upon the tubular or other part of the generator with which
it is in contact or in metallic connection.
According to another method the steam-generator is composed of one or more
serpentine tubes or coils connected at one end with the feed-water supply and at
the other end with a pipe for conducting the steam to an engine or motor or other
apparatus in which the steam is to be used and the regulator-tube extends along
the exterior of one or more of the said generating tubes or coils and is in metallic
connection therewith, so that when the heat applied to the generating tubes is

page_text: greater than is necessary to completely evaporate, the supplied feed-water, in its
passage through the generator, some of the water in the regulator-tube will be
converted into steam the pressure of which will actuate the regulating device
thereby increasing the supply of feed-water, and when the heat so applied is less
than is required to completely evaporate the supplied feed-water, some of the
steam contained in the regulator-tube will be condensed so that the pressure in
the regulator-tube will be diminished and the regulating device will be actuated
so as to diminish or cut off the supply of feed-water.
In carrying my said invention into practice according to either of these
methods, provision is made, if desired, for also regulating automatically the
supply of heat to the generating tubes or chambers.
In the accompanying drawings I have shown how my said invention may be
conveniently and advantageously carried into practice.
Figure 1 is a front elevation, and
Figure 2 a sectional side elevation, some of the parts being removed, showing
ene form of my improved apparatus.
Figure 3 is a vertical central section, drawn to an enlarged scale, of part of the
vapour-burner.
Figure 4 is a vertical central section showing another form or modification of
my regulator.
Figure 5 is a side elevation showing another arrangement of my improved
apparatus.
Figure 6 is a partial front elevation of an ordinary water-tube steam-generator
having my improvements applied thereto.
Like letters indicate corresponding parts throughout the drawings.
In the arrangement shown in Figures 1 and 2, a number of coiled or serpentine
generating tubes a, a, a² &c. are arranged one above another around and about
a central flue-tube e and are connected one to another in any convenient manner.
These tubes are preferably of different diameters or bores and are SO joined
together that the tubes of smaller bore are near the top and those of larger bore
beneath. The uppermost tube or coil a is connected with the feed-water supply-
pipe b, and the lowermost tube a10 is connected with a pipe c for conducting the
steam from the generator to an engine or other machine or apparatus in which
it is to be utilized.
A regulator-tube d is combined with the generating coils a-a10 and is united by
brazing or otherwise with one or more convolutions of each or any of the said
coils, so that it is in metallic connection therewith. By arranging the tube d
between two convolutions of the generating tube, as shown in the lower part of
the series of coils, it will be more or less shielded from the direct action of the
fire. The said regulator-tube, in all cases, is preferably in metallic contact or
connection with those parts of the generating tubes or chambers most liable to be
overheated.
The aforesaid tubes a-a10 and d, are enclosed in a casing f provided at its upper
end with a funnel f'; and heat is applied to the said tubes by means of a burner
enclosed in the lower part of another casing h, the upper part of which preferably
surrounds the casing f as shown, so as to leave a space between them for the
admission of air for promoting combustion, the air entering through an opening h¹
in the top of the casingh protected by a disc or ring projecting from the
funnel f and then passing down between the said casings and being thereby
heated on its way to the burner. The regulator shown in Figures 1 and 2 com-
prises a cylinder k in which is fitted a cylinder loaded by means of a spring 1,
which is preferably arranged in a closed chamber above the said cylinder. The
piston-rod is suitably coupled to a lever m pivoted at m¹ to a fixed bracket or
arm m2. The lower end of the said cylinder k is connected by a pipe n to a
chamber p, arranged outside the steam-generator, to which chamber the two ends
of the regulator-tube d are connected. The space beneath the piston in the
cylinder k, the pipe'n, the regulator-tube d and the chamber p are filled with water

page_text: or other suitable liquid some of which will be converted into steam as and when
required for the purposes hereinafter specified. By this arrangement I ensure a
circulation of liquid through the regulator-tube when heat is applied thereto,
thus preventing overheating of any part of the said regulator-tube. The
chamber p is so arranged in combination with the tube d that the tubular system
can be filled with water to a level above the top of the said tube d, and the upper
part of the said chamber p is sometimes made to serve as an air-chamber. I prefer,
however, to close the upper end of the said chamber by means of a cap consisting
of an air chamber pl so that, when the said chamber is closed, there will always
be a suitable quantity of air enclosed in the regulator to serve as a cushion which
will permit the expansion of the liquid before it is converted into steam.
It is evident that, if steam be generated in any part of the regulator-tube d,
pressure will be transmitted through the liquid therein and in the pipe nand
cylinder to the piston, and, when this pressure is sufficient to overcome the
force of the spring 7, the said piston will be raised and the lever m thus turned
upward about its pivot.
2
To utilize this action for automatically regulating or controlling the supply of
water to the generator a-a0, there is intercalated in the feed-pipe ba cylinder q,
in which is fitted a plunger or valve q¹ coupled by links q3 to the lever m. In
the lowermost position of the said lever, the plunger or valve q¹ closes or partially
closes the ports in the cylinder q communicating with the two parts of the feed-
pipe b. When steam is generated in the tubes or coils a-10, the pressure in the
tube d and on the underside of the piston is sufficient to raise the plunger q¹
through a short distance and keep the passage for the feed-water through the
cylinder q slightly open. Should any part of the tubes or coils a-a¹ be heated
above a predetermined temperature, the pressure in the regulator-tube d and
cylinder will be increased and the plunger or valve q' raised so as to allow more
feed-water to enter the tubes or coils a-a0, and when the temperature of the
said tubes or coils diminishes, the pressure in the said regulator-tube and cylinder
will be reduced and the said plunger or valve q will be moved downward by the
reaction of the spring 1 so as to reduce the supply of feed-water to the generator.
To permit the constant working of the feed-pump, notwithstanding variations
in the area of the passage through the cylinder q, an accumulator is provided
which communicates with the part of the feed-passage between two check-
valves s, sand which consists of a cylinder provided with a piston rl having a
spring arranged above the same, or of an air-vessel. An overflow pipe t is also
provided which is controlled by a loaded relief-valve t¹. When the feed-pump is
delivering more water than is required in the generator, the surplus water is
forced either into the accumulator r or through the relief-valve and overflow
pipe t. The piston-rod 3 of the accumulator extends through the top of the
cylinder and is provided with a handle so that the said accumulator can be
used as a hand-pump for forcing water into the generator at starting.
When it is desired to also regulate or control automatically the supply of fuel
for heating the generator, the regulator-lever m is preferably arranged to open
and close the orifices of a vapour-burner. It may however, be arranged to effect
such regulation or control by acting upon a cock or valve on a pipe for the supply
of liquid fuel or upon a damper, valve or the like for varying the supply of air
to promote combustion.
The vapour-burner shown in Figures 2 and 3 comprises a sliding valve g
arranged within a suitable casing g' which is connected by a pipe u with an
annular chamber u forming part of a vaporizer, which also comprises a series or
group of pipes u connected at their upper end with the said annular chamber 2,
and at their lower end with an annular tube or chamber v. This chamber is
connected with a pipe for the supply of liquid hydrocarbon. The sliding valve g
is coupled by means of a rod or link g to a cross-bar wel fixed in a ring w, which
ring is secured by means of a bayonet-joint in an eye formed on the lever m, so
that the vapour issuing from the burner can pass through the said ring. The

page_text: said valve is made with taper grooves g³, Figure 3, in its periphery, through which
the vapour can issue, and which are so arranged in combination with the upper
edge of the casing g that, by the raising and lowering of the said valve, the area
of the passages for the vapour will be diminished or increased.
Beneath the burner is arranged a cup or trough y for containing spirit to be
ignited to start the vapour-burner, the spirit being introduced into the said cup
cr trough through an inclined channel y¹ or in any other convenient manner.
By the means above described, when the lever m is raised or lowered by
variations of pressure in the regulator, the collective area of the passages for the
escape of the vapour from the burner will be diminished or increased
so as to vary the heat applied to the generator accordingly.
I can, if desired, use a weight in place of the aforesaid spring 7. By adjusting
the said spring or increasing or diminishing the weight on the said lever m I
can provide for maintaining any desired pressure in the boiler by means of my
improved regulator.
The operation of the apparatus shown in Figures 1 to 3 is as follows:-On
igniting the vapour issuing from the burner, steam pressure is generated in the
tube d and is communicated to the piston which is raised so that feed-water can
be forced into the generating coils a-a10, for example, by means of the pump r.
The regulator then acts in the manner above described to automatically regulate
or control the supply of feed-water and of heat to the generator. For example,
should the supply of heat be greater than is sufficient to completely evaporate the
supplied feed-water, in its passage through the generator, the piston will be
further raised so as to raise the plunger q' and permit a larger supply of feed-
water to enter the generator. Should, however, the supply of heat be insufficient
to completely evaporate the supplied feed-water, the regulator will operate to
depress the plunger q' and diminish the supply of feed-water.
If the supply of feed-water should fail, the regulator will operate to greatly
diminish the supply of heat to the generator and thereby prevent overheating
thereof. When the generator is thus heated and the steam outlets are closed so
that the steam cannot pass out, and a supply of feed-water is established, steam
will be generated in the said generator and the regulator will operate to regulate
the supply of feed-water and of heat to the generator until the steam-pressure
within the generator is greater than the pressure of the feed-water supply; the
regulator will then operate to greatly diminish the supply of heat to the generator
and the supply of feed-water will be stopped by the steam-pressure within the
generator, the relief-valve t on the feed-water supply-pipe & opening to permit the
escape of the superabundant supply of feed-water; when the steam outlets are
opened, the steam-pressure within the generator will be reduced and feed-water
will again enter the generator and some of the steam contained in the regulator-
tube will be condensed, the regulator will then operate to increase the supply of
heat and to regulate the supply of feed-water in proportion to the supply of heat.
Should the generator contain feed-water, and heat be applied, all outlets from
the generator being closed, steam will be generated in the generating tubes, and
in the regulator-tubes until the pressure in the latter is sufficient to operate the
regulator, the supply of heat will then be greatly diminished, thereby preventing
the pressure of the steam from rising beyond a desired value.
In Figure 4 I have shown an arrangement of my regulator wherein the sliding
valve g of the vapour-burner is secured directly to the upper end of the piston-
rod 2, and the plunger or valve gl is attached to a cross-head fixed on the said
piston-rod, the said rod, in this case extending through a stuffing box g
beneath the valve-casing gl of the burner.
In the arrangement shown in Figure 5, a furnace or combustion chamber A is
connected with the interior of the casing f which encloses the generating tubes
or coils a-a10 and the regulator-tube d, and beneath the fire-grate of the said
furnace is arranged a damper B for regulating or controlling the draught. An
arm B fixed on the spindle of the damper, is coupled to the regulator-lever m

page_text: by means of a pin B2 working in a slot m³ in the said lever, so that the action of
the lever m will, in addition to operating the feed-water regulating-valve, close
or open the said damper and thus regulate the heat applied to the generator by
varying the supply of air for promoting combustion.
In the application of my improvements to a water-tube boiler, as shown in
Figure 6, the steam-drum or receiver C is provided with an external supplementary
tube or chamber D in communication with the interior of the said drum or
receiver both below and above the normal water-level. This tube D forms a
lateral extension of the steam-drum C, so that when the water descends below the
lewer end or part of such tube or chamber, the latter, being exposed to the heat
of the fire, will rapidly become superheated, since it will then contain only
steam; and when the water rises in the said tube or chamber, the temperature of
the latter will be correspondingly lowered.
The regulator-tube d is brazed for a suitable part of its length to the tube or
chamber D so that heat will be rapidly conducted from one to the other. The
regulator-tube d extends through the side of the steam-drum or receiver C so
that only the part of the said regulator-tube in metallic connection with the
tubular extension D of the steam-drum will be superheated when the water-level
descends, the ends of the said tube passing out through the front plate or head C¹
of the drum and being provided with fittings or terminals E, E, one of which E,
is provided with a removable plug E and with a pipe n communicating with the
regulator-cylinder k, whilst the other, I, is closed by a plug E3 or by means of a
cock or valve.
The regulator-valve is of somewhat similar construction to that shown in
Figure 4 and comprises a valve-casing 9 provided with ports over
which travels a sliding-valve or piston-valve mounted on the end
of the piston-rod. A by-pass bhaving a controlling-valve 62 is provided around
the valve 2 so as to permit the supply of feed-water to the boiler when the fire is
out. A feed-check-valve F is also provided on the drum C.
To permit of recharging the regulator-tube d with water when required, I
sometimes connect a suitable pump with the said tube, by removing one of the
plugs E2, 3 and connecting the pump thereto, or preferably by means of an union
provided near the cylinder k. By opening a cock or valve on the other end E
cf the said tube, then forcing in water by means of the said pump and then closing
the said cock or valve, the regulating tube can be re-charged while the boiler is
under steam. If desired, the fittings E, E may be put into communication with
each other through a suitable pipe or passage so as to permit circulation of the
water in the pipe d.
The normal water-level in the boiler can be varied as desired by adjusting the
spring or the load on the lever m and thus varying the pressure which has to
be overcome in raising the said piston. It is evident that, if desired, this arrange-
ment of my apparatus can be adapted for regulating also the supply of heat to
the generator.
In applying my improvements to a Cornish or a Lancashire boiler, I some-
times provide the same with a bent or U-shaped tube in one of the side flues, in
communication with the interior of the boiler both below and above the normal
water-level so as to form a lateral extension of the boiler, the lower limb of the
said bent tube being preferably lagged or otherwise protected more or less from
the heat of the products of combustion. And I carry the regulating tube into
the said flue through the brickwork or other setting of the boiler, and braze a
portion of this tube to the aforesaid tube forming the lateral extension of the
boiler.
I sometimes arrange my regulator-tube in combination with the furnace-crown
or other part of a boiler which is liable to be overheated, in which case I braze
or otherwise secure a portion of the said tube to such furnace-crown or other part
of the boiler. And I connect the said tube with means for regulating or con-

page_text: trolling the feed-water supply, or for operating an indicator or a damper, or for
sounding an alarm.
In applying my invention to a steam-generating plant of large size, I prefer-
ably arrange a series of boilers so as to supply steam to a common steam-pipe or
main, and I feed these boilers from common fuel and water supplies; and I pro-
vide each boiler with a separate regulating device for controlling its own fuel
and water supply independently of the others.
It is obvious that I can somewhat vary the construction of my improved
apparatus without departing from the nature of my said invention. For instance
I can use other suitable devices for regulating or controlling the supply of feed-
water by means of the regulator above described. I can, if desired, use other
forms of burner for burning liquid or gaseous fuel, the supply being regulated or
controlled by a cock or valve operated by the aforesaid regulator. Or I can
connect the said regulator with a damper in the funnel or with any
other suitable device for varying the heat applied to the generator.
The regulator-tube may extend along the entire length of one or more of the
generating tubes or chambers or along only a portion of the length
thereof as may be found most desirable.
If desired separate regulator-tubes may be employed, one for regulating the
supply of feed-water, and the other for regulating the supply of heat. Or one
regulator-tube may be arranged to operate separate pistons for regulating the
supply of feed-water and heat respectively. It is evident, moreover, that my
improved apparatus may, if desired, be used for regulating the feed-water supply
only, as in the arrangement shown in Figure 6.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
First. A steam-generator provided with suitable means for regulating the
supply of feed-water thereto by the conversion of liquid into steam, and of steam
into liquid, in one or more tubes extending along the exterior of and in
metallic or thermal connection with one or more of the steam-generating tubes.
or chambers, substantially as hereinbefore described.
Second. In a steam-generator, the combination, with one or more of the steam-
generating tubes or chambers, of an independent tube extending along the
exterior of the same, and in metallic or thermal connection therewith, and com-
municating with a cylinder in which works a piston connected with a suitable
device for regulating the supply of feed-water, substantially as hereinbefore
described.
Third. A steam-generator wherein a regulator-tube extending along the
exterior of one or more of the steam-generating tubes or chambers and in metallic
or thermal connection therewith, is in communication with a cylinder in which
works a piston connected with suitable devices for regulating the supply of water
and of heat to the said generating tubes or chambers by the conversion of the
liquid contained in the said regulator-tube into steam and the condensation of
such steam into liquid, substantially as herein before described.
Fourth. A steam-generator provided with a supplementary tube or chamber so
arranged that the flame or heating gases will come in contact therewith and
extending above and below the water-level, and with a regulator-tube in metallic
or thermal connection with the said supplementary tube or chamber and com-
municating with an apparatus for regulating the supply of feed-water to the said
generator, actuated by varying steam-pressures generated in the said regulator-
tube, substantially as, and for the purposes, hereinbefore described.
Fifth. The combination with the feed-water supply pipe and the means for
automatically regulating or controlling the supply of feed-water, of the accumu
lator and relief valve, substantially as, and for the purposes, herein before
described.

page_text: Sixth. The modification of my invention wherein provision is made for the
circulation of the liquid in the regulator-tube.
Seventh. The improved apparatus constructed substantially as described with
reference to Figures 1, 2 and 3, or to Figure 4, or to Figure 5 or to Figure 6 of
the drawings and operating as, and for the purposes, above specified.
Dated this 30th day of August 1897.
D. YOUNG & Co.,
11 and 12 Southampton Buildings, London, W.C.,
Agents for the Applicant.