Improvements in or relating to Steam Generators.
Year: 1899

page_text: Date of Application, 16th Mar., 1899
Complete Specification Left, 18th Dec., 1899 -Accepted, 16th May, 1900
PROVISIONAL SPECIFICATION.
Improvements in or relating to Steam Generators.
We, THOMAS CLARKSON, Engineer, and THE CLARKSON & CAPEL STEAM CAR
SYNDICATE LIMITED, both of Deverell Street, Great Dover Street, in the County
of Surrey, do hereby declare the nature of this invention to be as follows:-
This invention relates to steam generators more particularly to that type in
which no constant water level is maintained, the water being fed into one end
of series of coiled tubes connected together and arranged so that steam in a
more or less superheated state issues from the other end.
According to this invention the boiler comprises a coil of tubing, into which
the water is led, arranged so as to receive heat from the products of combustion
just before these products escape into the atmosphere. This feed heating coil is
connected to a coil of tube which is arranged so as to encircle the flame from a
vapour burner which is the source of heat preferably employed. Above the
burner lie, one above the other a series of involute coils of tube from one of
which the steam delivery pipe leads.
One of the preferred constructions is as follows:-
Within an insulated casing of suitable shape are formed two cylindrical
chambers arranged side by side with their axes parallel. One of these chambers
may be termed the steam generating chamber and the other the feed water
heating chamber. In the latter is arranged concentrically a tube which runs
down almost to the bottom of the chamber which is closed, and at the top leads
into an exhaust box through which the products of combustion can escape into
the atmosphere. Beneath the casing enclosing the whole apparatus lies the
burner box, the burner or burners being so arranged as to deliver a mass of
flame into the bottom of the steam generating chamber. Around the central
tube in the feed heating chamber is coiled a tube into the lower end of which
the feed water is forced by a suitable pump. From the upper end of this coil
leads a tube which passes downwards and into the bottom of the steam generating
chamber where it is connected to a tube which is coiled closely around the wall
of this chamber so as to form a water wall around the actual flame of the burner.
The top of this close coil of tube communicates with the lowest of a series of
involute coils of tube which are arranged one above the other in the steam
generating chamber. These involute coils are so connected up that the steam
generated in the lowermost coils passes up through the series and is superheated
to the required extent being delivered by a suitable tube from the uppermost
coil.
The products of combustion from the burner pass upwards through and around
the involute coils, being then deflected by a plate, forming the top of the steam
generating chamber, downwards into the feed heating chamber which they
traverse from top to bottom finally passing up the central tube and out into
the atmosphere. In the feed heating chamber the products of combustion pass
downwards over the feed water coil preferably in the opposite direction to which
the water is passing through this coil.

page_text: The water supply is maintained by a suitable pump which is continually in
operation while the engine is working, a suitable relief valve being situated in
the feed water pipe so that when a certain pressure is exceeded, though the pump
continues to operate, the surplus water passes through the relief valve and
returns to the supply tank.
case.
In another arrangement of the boiler where space will not allow of the two
cylindrical chambers being arranged side by side, the boiler comprises a single
chamber of greater length than the steam generating chamber in the previous
In the lower part of this chamber is arranged the coil of tube forming
the water wall around the burner and above it the involute coils through which
the steam passes.
Above the uppermost of these steam coils are arranged other
involute coils through which the feed water is led entering at the topmost and
issuing at the lowermost which communicates by a tube with the lowermost coil
of the water wall. The involute coils above mentioned may each be formed
separately and connected together by suitable junction pieces or they may be
formed in pairs the innermost end of one coil being carried down and continued
in a second involute coil beneath the other, the two ends of this double coil
being then connected with other elements by suitable junctions pieces or other-
wise as found convenient.
It is preferable to arrange the junctions of the coils in such a manner that
they may be all situated one above or adjacent to each other in such a way that
the portion of the casing covering them may readily be removed to allow of
access to the joints.
It has been found that when the supply of steam from the boiler is partially
or entirely shut off the temperature of the coils rises considerably unless the
supply of vapour to the burner is correspondingly controlled. In order to enable
this to be done the following regulating device may be employed. A suitable
bar is rigidly mounted on some part of the boiler or burner casing and in this
bar are formed two holes into one of which is screwed one end of a stout brass
tube while through the other hole freely passes one end of a corresponding iron
tube. On the other side of the bar these tubes communicate with two of the
involute coils in the steam generating chamber. The free ends of the brass and
iron tubes are screwed firmly into a steel block within which is a passage to
allow steam to circulate freely from one tube to the other on its way through the
coils of the generator. It will be seen that owing to the different coefficients of
expansion of the metals of which the tubes are made, the length of these tubes
will alter in such a way that the block attached to their free ends will more
in accordance with the variations in the temperature of the fluid passing through
the tubes. By suitably connecting this block to a lever its movement is caused
to regulate the supply of fuel to the burner.
A nut, together with if desired a lock-nut, upon a screw-threaded portion of
the iron tube adjacent to the hole in the bar enables the point at which the
apparatus will come into operation to be adjusted, this point depending upon
the position of this nut and the temperature at which it will be caused to abut
against the bar and rigidly hold the end of the iron tube against axial movement.
A convenient way of arranging the lever operated by this regulating device
is as follows:-
Two side plates which enclose the tubes throughout their length carry pivotted
To their outer ends a lever formed of two plates which also lie on either side
of the two regulator tubes inside the side plates above mentioned. A pin con-
necting these lever plates passes through a slot in the steel block on the ends of
the tubes the lever being carried backwards and its free end arranged adjacent to
the bar which carries the regulator tubes.
It will be understood that a similar type of regulator may be made up by
using rods of metals having different coefficients of expansion in place of the
tubes above described, the rods being so arranged that the temperature of the
steam will be communicated to them say by having the rods surrounded by
a tube, coiled or otherwise through which the fluid from one of the generator

page_text: coils passes and will cause their expansion in a manner corresponding to the
tubes. If desired metals other than brass and iron may be employed for the
construction of the regulator tubes or rods. The brass and iron tubes may be
arranged otherwise than above described, the iron tube for example being fixed
into the bar and the brass tube passing freely through it.
Instead of employing two tubes of different metals, a U-tube through which
the steam can pass may be combined with a tie rod of some different metal to
that used to form the tube. The tie rod can be arranged so as to be adjustable
to regulate the point at which the apparatus will come into action.
If desired some other form of regulator than that above described may be
used for controlling the supply of fuel to the burner in accordance with the
quantity of steam utilized.
It must be understood that the details of construction may be varied without
departing from the spirit of the invention.
Dated this 16th day of March 1899.
BOULT & WADE,
Agents for the Applicants.
Improvements in or relating to Steam Generators.
We, THOMAS CLARKSON, Engineer, and THE CLARKSON & CAPEL STEAM CAR
SYNDICATE LIMITED, both of Deverell Street, Great Dover Street, in the County
of Surrey, 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 relates to steam generators more particularly to that type in
which no constant water level is maintained, the water being fed into one end
of a series of coiled tubes connected together and arranged so that steam in a
more or less superheated state issues from the other end.
According to this invention the boiler comprises a coil of tubing into which
the water is led arranged so as to receive heat from the products of combustion
just before these products escape into the atmosphere. This feed heating coil is
connected to a coil of tube which is arranged so as to encircle the flame from a
vapour burner which is the source of heat preferably employed. Above the
burner lie one above the other a series of involute coils of tube from one of
which the steam delivery pipe leads.
One of the preferred constructions is as follows:-
Within an insulated casing of suitable shape are formed two cylindrical
chambers arranged side by side with their axes parallel. One of these chambers
may be termed the steam generating chamber and the other the feed water
heating chamber. In the latter is arranged concentrically a tube which runs
down almost to the bottom of the chamber which is closed, and at the top leads
into an exhaust box through which the products of combustion can escape into
the atmosphere. Beneath the casing enclosing the whole apparatus lies the
burner box, the burner or burners being so arranged as to deliver a mass of
flame into the bottom of the steam generating chamber. Around the central
tube in the feed heating chamber is coiled a tube into the lower end of which
the feed water is forced by a suitable pump. From the upper end of this coil
leads a tube which passes downwards and into the bottom of the steam generating
chamber where it is connected to a tube which is coiled closely around the wall
of this chamber so as to form a water wall around the actual flame of the burner.

page_text: The top of this close coil of tube communicates with the lowest of a series of
involute coils of tube which are arranged one above the other in the steam
generating chamber. These involute coils are so connected up that the steam
generated in the lowermost coils passes up through the series and is superheated
to the required extent being delivered by a suitable tube from the uppermost
coil.
The products of combustion from the burner pass upwards through and around
the involute coils, being then deflected by a plate, forming the top of the steam
generating chamber, downwards into the feed heating chamber which they
traverse from top to bottom, finally passing up the central tube and out into
the atmosphere. In the feed heating chamber the products of combustion pass
downwards over the feed water coil preferably in the opposite direction to which
the water is passing through this coil.
The water supply is maintained by a suitable pump which is continually in
operation while the engine is working, a suitable relief valve being situated in
the feed water pipe so that when a certain pressure is exceeded though the pump
continues to operate, the surplus water passes through the relief valve and
returns to the supply tank.
In another arrangement of the boiler where space will not allow of the two
cylindrical chambers being arranged side by side the boiler comprises a single
chamber of greater length than the steam generating chamber in the previous
case. In the lower part of this chamber is arranged the coil of tube forming
the water wall around the burner and above it the involute coils through which
the steam passes.
Above the uppermost of these steam coils are arranged other
involute coils through which the feed water is led entering at the topmost and
issuing at the lowermost which communicates by a tube with the lowermost coi!
of the water wall. The involute coils above mentioned may each be formed
separately and connected together by suitable junction pieces or they may be
formed in pairs the innermost end of one coil being carried down and continued
in a second involute coil beneath the other, the two ends of this double coil
being then connected with other elements by suitable junction pieces or other-
wise as found convenient.
It is preferable to arrange the junctions of the coils in such a manner that
they may be all situated one above or adjacent to each other in such a way that
the portion of the casing covering them may readily be removed to allow of
access to the joints.
It has been found that when the supply of steam from the boiler is partially
or entirely shut off the temperature of the coils rises considerably unless the
supply of vapour to the burner is correspondingly controlied. In order to enable
this to be done the following regulating device may be employed. A suitable
bar is rigidly mounted on some part of the boiler or burner casing and in this
bar are formed two holes into one of which is screwed one end of a stout brass
tube while through the other hole freely passes one end of a corresponding iron
tube. On the other side of the bar these tubes communicate with two of the
involute coils in the steam generating chamber. The free ends of the brass and
iron tubes are screwed firmly into a steel block within which is a passage to
allow steam to circulate freely from one tube to the other on its way through the
coils of the generator. It will be seen that owing to the different coefficients of
expansion of the metals of which the tubes are made, the length of these tubes
will alter in such a way that the block attached to their free ends will move
in accordance with the variations in the temperature of the fluid passing through
the tubes. By suitably connecting this block to the lever its movement is caused
to regulate the supply of fuel to the burner.
A nut, together with if desired a lock-nut upon a screw-threaded portion of
the iron tube adjacent to the hole in the bar enables the point at which the
apparatus will come into operation to be adjusted, this point depending upon
the position of this nut and the temperature at which it will be caused to

page_text: abut against the bar and rigidly hold the end of the iron tube against axial
movement.
A convenient way of arranging the lever operated by this regulating device
is as follows:-
Two side plates which enclose the tubes throughout their length carry pivotted
to their outer ends a lever formed of two plates which also lie on either side
of the two regulator tubes inside the side plates above mentioned. A pin con-
pecting these lever plates passes through a slot in the steel block on the ends of
the tubes the lever being carried backwards and its free end arranged adjacent to
the bar which carries the regulator tubes.
It will be understood that a similar type of regulator may be made up by
using rods of metals having different coefficients of expansion in place of the
tubes above described, the rods being so arranged that the temperature of the
steam will be communicated to them say by having the rods surrounded by
a tube, coiled or otherwise through which the fluid from one of the generator
coils passes and will cause their expansion in a manner corresponding to the
tubes. If desired metals other than brass and iron may be employed for the
construction of the regulator tubes or rods. The brass and iron tubes may be
arranged otherwise than above described, the iron tube for example being fixed
into the bar and the brass tube passing freely through it.
Instead of employing two tubes of different metals, a U-tube through which
the steam can pass may be combined with a tie rod of some different metal to
ihat used to form the tube. The tie rod can be arranged so as to be adjustable
to regulate the point at which the apparatus will come into action.
If desired some other form of regulator than that above described may be
used for controlling the supply of fuel to the burner in accordance with the
quantity of steam utilized.
It must be understood that the details of construction may be varied without
leparting from the spirit of the invention.
In the accompanying drawings
Figure 1 is a sectional elevation of a steam generator constructed in accordance
with this invention.
Figure 2 is a plan of the same, the top of the casing being removed.
Figure 3 is a sectional elevation of a modified arrangement of the boiler.
Figure 4 is a plan of a modified arrangement of the involute coils.
Figure 5 is a section on the line of Figure 4.
Figure 6 is a sectional elevation of one construction of the improved regulator.
Figure is a plan of the same.
Figure S is a sectional elevation of a modified construction of regulator.
Figures 9, 10 and 11 show other forms of regulator.
Like letters indicate like parts in all the figures.
A casing composed of twin cylindrical parts A and A' is mounted on a suitable
basc A constructed so as to contain some suitable source of heat, such as an oil
burner B. The portion A of the casing contains the steam generator proper, and
will hereafter be termed the steam generating chamber, while the portion A¹
will hereafter be termed the feed water heating chamber. The twin casing A A'
is closed below by a plate A3 forming part of the base A3, an opening A being
left in this plate beneath the steam generating chamber A to allow of the flame
of the burner B having access to the coils of tube within the chamber A. The
top of the twin casing is closed by a plate A Passing through an opening in
this plate in the top of the feed water heating chamber A' and concentric with
the casing of this chamber, is arranged a tube C, which reaches nearly to the
bottom of the feed water heating chamber. A tube D is led in to this chamber
conveniently near the top through the casing A¹ and coiled round helically
within the tube C down to the bottom. Thence the tube D is carried outside
the tube C and coiled helically round the outside of the latter to the top in the
manner shown in Figure 1. From the top of the outside of the tube C, the
tube D is led downwards as at D', either within the feed water heating chamber

page_text: and through the wall of this chamber, or outside it and then through the wall
of the generating chamber at A. The tube is now coiled round as at D2 within
the casing A the coils being arranged close together so as to form a wall around
the source of heat. At a suitable point the coiling of the tube in this manner is
discontinued the tube being now arranged in a series of involute coils as at D³
these coils being superimposed above the source of heat and all connected
together as shown in Figure 1 to form a continuous conduit the end of the
tube D' for delivering the steam being led out through the wall A of the casing
of the generating chamber.
An opening A is made in the walls of the casings A and A¹ where these are
adjacent to each other the opening being at or near the top of the casings and
of such a size as to allow the products of combustion to pass freely from the
steam generating chamber down into the feed water heating chamber, these
products of combustion being deflected by the plate A which forms the top of
the casings A and A¹. The actual course of the products of combustion is
indicated in Figure 1 by arrows. It will be seen that these products pass up-
wards around the involute coils of tube 13 and down around the coils D and
thence up again within the tube C and out into the atmosphere, a casing AB
deflecting the products in a lateral direction.
The modification shown in Figure 3 is adapted for use where there is not
sufficient space to arrange the twin casings A A'. In this arrangement a single
casing A encloses the whole coil, the tube D being led in at the top of this
casing and arranged in a few involute coils, and then carried downwards as at ])',
and through the wall of the casing A near the bottom of the latter at A6, the
tube being then coiled round as at De to form the wall around the source of heat.
Above the latter the tube is arranged in involute coils as at 13, and carried out
from the casing A, as at D. In this arrangement the products of combustion
pass straight up around the involute coils 13 and D, and out through the open-
ing A in the conical top of the casing A.
The involute coils D3 may be arranged so that the contents of the generator
either enter at the centre or at the outer end as found convenient. If desired,
the coils may be arranged in pairs in the manner shown in Figures 4 and 5,
where it will be seen that the tube is coiled from without inwards in the lower
part, and led up and doubled back on itself to form the upper and second part.
The several portions of the tube constituting the continuous conduit D D D
D3D may be joined up together in any convenient manner.
In the accompanying drawings no joints are indicated, the coil being shown
diagrammatically as continuous. In practice however, the several parts of the
coil, such as the several involute coils, the coil forming the wall around the
source of heat and the feed heating portions are formed separate and connected
together by joints which for convenience in having access to them, are arranged
in the chamber I formed by the curved portions of the casings A and A' and a
removable door F¹.
In order to assist the productions of combustion in following the prescribed
course through the generator, a fan may be arranged to exhaust air from the
feed water heating chamber, the fan being, for example, arranged within the
casing A8 as at E on the top of the generator. The fan may be driven from
some moving part of the engine driven by the steam from the generator.
If desired the top of the feed water heating chamber may be closed in and
the tube C dispensed with, the products of combustion being then led away
from the bottom of the casing A' preferably through an opening in the plate A
or otherwise. The fan in this case is situated in a suitable position in the
passage for conducting the exhaust products away.
A regulator made in accordance with this invention is illustrated in Figures 6, 7
and S and is constructed as follows:-
Into a rigid bar or plate G is screwed one end H¹ of a brass tube H, the other
end H of this tube is screwed into a steel block J hollowed out as at J1 and

page_text: provided with a shoulder or projection J. Through a hole G¹ in the bar G is
passed an iron tube K, one end K of which is screwed into the block J, the other
end K' projecting through the hole G in the bar G. The end K2 of the tube K
is screw-threaded and carries a nut L and a lock-nut L¹.
If steam is now allowed to pass in at the end H¹ of the tube H through the
hollow in the block J through the tube K, and out at the end K', the tubes H
and K will expand, but in different ratios, with the result that the tube K will
be drawn out from the hole G in the bar G, and the nut L will butt up against
the face of the bar G. If the expansion still continues the block J will be moved
downwards owing to the expansion of the brass tube H being greater than that
of the iron tube K, the tubes acting as a lever.
This movement is utilised by the following mechanism to bring about control
of the heat to the generator; -
Projecting from the bar G and lying on either side of the tubes H and K are
arranged two plates M, which are cut away as indicated in dotted lines at M'.
At their free ends the plates M are connected by bolts M2, another bolt M³ which
passes through the two plates serving as the pivot for a lever formed of two
plates N, which lie on either side of the tubes H and K, and with their pivotted
ends between the plates M. The plates N are connected together by bolts N' and
the free ends of those plates pass out from the openings M¹ in the plates M,
and are joined together by a bolt N2 preferably on the side of the bar G remote
from that on which the pivot of these plates is situated. Between the plates N
and securely attached to them near the pivot M³ in a suitable position in relation
to the block J, is a bar or block N³ through which passes a set screw N, the end
of which lies beneath the shoulder J2 on the block J; the set screw N is pro-
vided with a lock-nut N³ to enable it to be fixed in any position.
If now the block J is moved in the manner described the shoulder J2 will come
in contact with the end of the screw N and further movement of the block J
in a downward direction will bring about a downward movement of the lever
formed of the plates N. The lever is caused to return to its normal position by
a balance-weight or spring.
In the construction shown in Figures 6 and 7 the block always remains in
contact with the screw N, but no movement of the lever will take place until
the tubes H and B have expanded sufficiently to cause the nut L to butt up
against the bar G. In the modification shown in Figure 8 however, in place of
the tube K passing freely through the hole in the bar G the tube is secured there
by the lock-nuts L. With this arrangement the block J is normally in such a
position that the shoulder J2 does not quite touch the end of the screw N, con-
tact taking place when sufficient expansion has caused the tube H to bend the
tube K downwards.
The space between the bar G and the nut L in the construction shown in
Figures 6 and 7, or between the shoulder J and the end of the screw N in the
construction shown in Figure 8, constitutes a certain amount of slack which has
to be taken up before the lever, formed by the tubes H and K operates to move
the lever N. By adjusting this space therefore the temperature at which the
apparatus is to come into operation is determined.
The water supply is maintained by a suitable pump which is continually
in operation while the engine is working a suitable relief valve being situated in
the feed water pipe so that when a certain pressure is exceeded though the pump
continues to operate the surplus water passes through the relief valve and returns
to the supply tank.
In the construction of regulator illustrated in Figure 9 the tubes H and K
both have their ends H' K' screwed into and rigidly secured to the base-piece G.
The block J is replaced by a curved tube J3 to which the ends H2 K2 of the
tubes H and K are attached. The lever N is pivotted at H³ and K³ to blocks
mounted directly upon the tubes H and K, the latter being situated as close to

page_text: each other as possible so as to enable the maximum movement to be given to
the lever N by the unequal expansion of the tubes.
A similar type of regulator may be made up by using rods of metals having
different co-efficients of expansion in place of the tubes above described the rods
being so arranged that the temperature of the steam will be communicated to
them say by having the rods surrounded by a tube, coiled or otherwise through
which the fluid from one of the generator coils passes and will cause their
expansion in a manner corresponding to the tubes. Such a construction is
shown in Figure 10 where metal rods Hand K having different co-efficients of
expansion, are employed instead of the tubes H and K. These rods are rigidiy
attached at one end to the base G, their free end being pivotally connected at H³
and K to the lever N. A coil of tube D5 is disposed around the rods H and K+,
the ends of this coil being connected by pipes D and D7 to the generator.
casing encloses the whole regulating device, the outer ends of the rods H+
and K projecting through holes in the end of the casing.
A
If desired metals other than brass and iron may be employed for the con-
struction of the regulator tubes or rods. The brass and iron tubes may be
arranged otherwise than above described, the iron tube for example being fixed
into the bar and the brass tube passing freely through it.
Instead of employing two tubes of different metals, a U-tube through which
the steam can pass may be combined with a tie rod of some different metal to that
used to form the tube. The tie rod can be arranged so as to be adjustable to
regulate the point at which the apparatus will come into action. This con-
struction is illustrated in Figure 11. The tubular member H is curved into
U-form and rigidly secured at its ends to the base-piece G. One end of the
solid member which is in the form of a rod K passes through a hole G¹ in the
base-piece G, the end of the rod being screw-threaded and provided with a nut
and lock-nut. The lever N is pivotally connected at K³ to the end of the rod K
and at H³ to a block carried upon the U-tube H. The rod K may if desired be
rigidly secured in the base-piece G but by arranging it to pass through a hole
as shown in the drawing a certain amount of slack is given to the device this
slack having to be taken up before the regulator comes into action.
If desired some other form of regulator than that above described may be used
for controlling the supply of fuel to the burner in accordance with the quantity
of steam utilised.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is: -
1. In a steam generator the combination with a coil of tube constituting a feel
water heater heated by the waste products of combustion of a coil of tube forming
a wall around a source of heat and a series of involute coils of tube superimposed
above the source of heat all the coils being connected together to form one con-
tinuous conduit substantially as described.
2. In a steam generator the combination with a twin casing of a coil of tube
such as 1) constituting a feed water heater situated in one part of the casing and
a coil of tube such as D2 and involute coils such as 13 arranged in the other part
of the casing all the coils D D and D³ being connected together to form one
'continuous conduit substantially as described.
3. In a steam generator the combination with a twin casing such as A A¹ of
a continuous conduit formed of coils of tube such as D 12 13 arranged in the
casing substantially as described so that the feed water enters the conduit in a
direction contrary to that in which the products of combustion pass through the
casing with or without a fan for the purpose described.
4. In a regulator for a steam generator the combination with metallic mem-
bers such as H K having different co-efficients of expansion of a block such as J
connecting the ends of the members and a lever so disposed that it can be

page_text: moved for the purpose described by the movement of the members H K conse-
quent on their expansion when subjected to the heat of the contents of the
generator substantially as described.
5. In a regulator for a steam generator the combination with metallic tubular
members such as H K having different co-efficients of expansion of a hollow
spring connecting the free ends of the members and a lever pivotted to each
member in such a manner that the relative movement of the members consequent
on their expansion when the contents of the generator pass through them will
bring about a movement of the lever and through suitable mechanism control
the supply of heat to the generator substantially as described.
6. The combination with a steam generator and a regulator such as described
of a liquid fuel burner controlled by the regulator in the manner and for the pur-
pose described.
7. The complete steam generator substantially as described or illustrated in
Figures 1 and 2 or Figure 3 of the accompanying drawings.
8. The complete involute coil for a steam generator of the kind described sub-
stantially as described and illustrated in Figures 4 and 5 of the accompanying
drawings.
9. The complete regulator for a steam generator substantially as described or
illustrated in Figures 6 and 7 or Figure or Figure 9 or Figure 10 or Figure 11
of the accompanying drawings.
Dated this 18th day of December 1800
BOULT, WADE & KILBURN,
Agents for the Applicants.