Year: 1899

page_text: I, WILLIAM PATERSON, of 55, Strathblaine Road, Wandsworth Common, in the
County of London, Engineer, do hereby declare the nature of this invention to
be as follows:-
This invention relates to improvements in filters for filtering water and other
liquids and has for its object to utilise the increased pressure exerted by the
liquid to be filtered on the filter bed when the latter is dirty or silted up, to
operate means whereby the flow of the liquid through the filter bed is reversed,
the filter bed cleansed, and the filtering action again started after such cleansing.
The essential feature of my invention consists in arranging a valve, trip or
equivalent device in connection with the filter inlet or in connection with the
filter inlet and outlet; said valve, trip or equivalent device being arranged to
come into operation when the pressure at the inlet side of the filter, or when the
excess of pressure at the inlet side of the filter over the pressure at the outlet
side thereof, exceeds a predetermined amount, and to actuate means whereby the
inlet pipe is closed, the inlet side of the filter opened to a drain pipe and the
previously filtered or other water with or without steam or compressed air enabled
to flow through the filter bed in the reverse direction so as to break up and
wash or cleanse the said bed. The said means being also so arranged that after
the cleansing operation is complete the water inlet is again opened, the inlet side
of the filter closed to the drain pipe and the steam or compressed air shut off so
that the washing or cleansing action is stopped and the ordinary filtering action
again enabled to proceed.
My invention also relates to mechanically operated means whereby the velocity
of the reversed or cleansing flow of water through the filter may be regulated so
as to prevent loss or damage of the filtering medium.
According to one form of construction, the liquid is admitted to the filter
through an equilibrium or other suitable valve and an equilibrium piston is
arranged in connection with the fluid spaces at either side of the filter bed. The
load on the equilibrium piston is capable of adjustment and the said piston is
arranged through suitable connections to open a valve and allow liquid to escape
from the liquid inlet or other convenient pipe when the excess of pressure on the
inlet side of the filter over the pressure of the filtered liquid on the outlet side
of the filter (exceeds a given amount; any increase in the pressure on the outlet
side of the filter due to a back flow of filtered liquid or a stoppage or partial
stoppage of the filtered liquid outlet, only serving to increase the load on the
equilibrium piston.
When such an increase of pressure on the inlet side of the filter occurs it over-
comes the loaded equilibrium piston and opens the valve, allowing liquid to
escape from the inlet or other pipe and flow into a syphon chamber. When this
syphon chamber is sufficiently full the syphon operates and quickly transfers the
liquid therefrom into a float chamber and thus raises the float therein.

page_text: This float is connected by suitable means with the fluid inlet valve, a valve or
cock connecting the inlet side of the filter to a drain pipe, and a cock or valve
for admitting compressed air or steam to the outlet side of the filter bed when
required, or with a suitable combination of these. Such means may consist of
a valve or cock operated by the float spindle and arranged in the course of a
pipe one end of which is connected to the fluid inlet pipe at a point outside the
fluid inlet valve or other pressure source, and the other end of which leads to
the inlet valve, a valve opening the inlet side of the filter to a drain pipe and
also an air or steam pressure valve for admitting compressed air or steam to the
outlet side of the filter bed.
Or the said float may be arranged to operate a trip device or piston connected
by a suitable arrangement of levers or their equivalent to the inlet valve, the
valve connecting the inlet side of the filter to the drain pipe and the air pressure
or steam valve.
The float chamber is provided with a syphon whereby it is emptied; the action
of the said syphon being started when the float chamber is sufficiently full.
When the filter bed becomes silted up or foul, the liquid cannot pass freely
therethrough so that the pressure on the inlet side of the said bed gradually
increases as the bed gets foul and when the excess of pressure on the inlet
side of the filter over the pressure at the outlet side of the filter due to this
cause, exceeds a given amount, the valve is opened by means of the equilibrium
piston and the liquid escaping from the fluid inlet or other pipe, flows into the
syphon chamber more or less gradually filling it; when sufficiently full the con-
tents of this chamber are rapidly transferred by its syphon into the float chamber,
the float immediately rises and causes the fluid inlet valve to be closed, the inlet
side of the filter to be opened to the drain, and compressed air or steam to be
admitted to the outlet side of the filter bed. The filtered water then either by
means of its back pressure alone or assisted by an air blast or steam blower, is
caused to flow through the filter bed or beds in the reverse direction and escape
from the inlet side of the filter to the drain pipe, steam or compressed air being
at the same time blown through the filter bed, also in the reverse direction; and
the filter being thus thoroughly loosened and cleansed.
When the float chamber is sufficiently filled with liquid its syphon comes into
operation and empties it, thus allowing the float to fall and open the liquid inlet
valve, close the inlet side of the filter to the drain, and shut off the steam or
compressed air, so that filtering again proceeds.
The length of time for which the cleansing operation continues depends, in
this case, upon the length of time that the float remains in its raised position,
and this may be regulated by means of a valve in the syphon for emptying the
float chamber, or by varying the difference of level between the two ends of the
syphon.
The object of first conducting the escaping liquid into the syphon chamber, is
that although such liquid may only escape slowly, the syphon may transfer this
liquid rapidly raised to the float chamber and the float be thus rapidly raised
and the cleansing operation started with precision and rapidity.
When the float operates a trip device and arrangement of levers or their
equivalent, however, this syphon chamber may be omitted.
It is obvious that instead of effecting the cleansing operation by the escape of
liquid as above described, the equilibrium piston or its equivalent may be
arranged to directly operate a trip device and lever or similar arrangement or
operate a valve connected with some liquid or vapour pressure source for actuating
the inlet, drain, and compressed air or steam valves for cleansing the filter and
re-starting the filtering.
In place of the said equilibrium piston and its valve, I may employ a valve
the load on which is capable of regulation and which communicates with the
inlet side of the filter only. The said valve being arranged to open when the

page_text: pressure on the inlet side of the filter exceeds a given amount and effect the
cleansing and subsequent re-starting of the filter either by means of an escape of
liquid or by means of a trip or other arrangement as above described.
In order that the velocity of the reverse flow of filtered water for cleansing the
filter may not be too great and cause loss or damage of the filtering medium, I
arrange a flap or throttle valve in the outlet pipe in such manner that the said
valve will remain open and allow a free passage while the filtered liquid flows
away from the filter but that it will partially close the outlet pipe and thus
prevent a too rapid back flow when the direction of the flow is reversed for
cleansing the filter. Or such flap or throttle valve may be arranged to completely
close the outlet pipe when the flow of liquid is reversed for cleansing, the liquid
then flowing in the reverse direction through a suitable bye pass.
If the back pressure of the liquid is insufficient to effect the cleansing of the
filter, it may be increased by an air or steam jet or equivalent device.
It is obvious that instead of utilising the already filtered liquid for cleansing
the filter, the outlet pipe may be closed and liquid under pressure from other suit-
able source, such as the inlet, be caused to flow through the filter bed in the
reverse direction.
DIL
02.1 1
"
1000
I, WILLIAM PATERSON, of 14, Killarney Road, Wandsworth Common, in the
County of London, late of 55, Strathblaine Road, Wandsworth Common, in the
County of London, 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 :-
This invention relates to improvements in filters for liquids, and has for its
object to utilise the increased pressure exerted by the liquid on the filter bed
when the latter is foul, to mechanically operate means whereby the flow of the
liquid through the filter bed is reversed, the filter bed cleansed and the filtering
again started after such cleansing.
The essential feature of my invention consists in arranging a valve or equivalent
device in connection with the filter inlet or with both the filter inlet and outlet,
in such manner that when either the pressure at the inlet side of the filter, or
the excess of pressure at the inlet side of the filter over the pressure at the
outlet side thereof, exceeds a certain predetermined amount, the said valve opens
and actuates means whereby the direction of the flow of liquid through the filter
is reversed and the filter opened to a drain pipe, for the purpose of cleansing
the filter bed; and that when the pressure on the inlet side of the filter is
reduced the said valve closes thereby permitting the filtering to proceed.
The said valve or its equivalent may also operate means for blowing a cleansing
blast of air steam or other gas through the filter bed when the latter is foul, in
the reverse direction to the passage of the liquid during filtering.
According to one method of carrying my invention into effect I place an
adjustable spring valve either directly under the control of the pressure at the
inlet side of the filter, or I fix to the stem of said valve a piston which is operated
by the excess of pressure on the inlet side of the filter bed over the pressure on

page_text: the outlet side of the filter bed. The load on this valve is adjusted so as to
permit the valve to open and liquid to flow through said valve into a syphon
chamber, when the pressure on the inlet side of the filter or the excess of pressure
on the inlet side over the pressure on the outlet side of the filter, exceeds a given
amount. The contents of this syphon chamber are rapidly transferred by a
syphon to a float chamber in which a float then rises and operates a four-way
cock or its equivalent. This four-way cock is adapted to open the opposite ends
of a cylinder to fluid pressure and exhaust respectively, and thereby operate a
piston in said cylinder. A rod on which this piston is fixed passes fluid-tight
through the ends of the cylinder and operates a valve or valves controlling the
inlet and drain pipes, or the inlet, outlet and drain pipes of the filter. This
piston rod may also be adapted to operate a valve or cock controlling a supply of
steam for operating an air or gas injector or equivalent means for forcing a blast
of air or gas through the filter bed for cleansing purposes.
The aforesaid float chamber is emptied by an adjustable syphon or outlet, and
when the float falls by gravity, the various valves are again reversed and permit
the filtering operation to proceed.
In order that my invention may be clearly understood and readily carried into
effect I will proceed to describe the same more fully with reference to the
accompanying drawings in which:
Figure 1 is a sectional elevation of a filter constructed according to my
invention.
Figure 2 is a sectional elevation of a filter showing a modified form of my
invention.
Figure 3 is an end view of the reversing cock and its connection drawn at
right angles to Figure 2.
Figure 4 is a longitudinal section, and Figure 5 is a section on line 1-1
Figure 4, of the four way cock and its connections, drawn to a larger scale.
The same letters of reference indicate like parts in all the figures.
Referring to the construction shown in Figure 1, Ais a closed filter casing. Bis
a filter bed supported in the said casing by a plate a. a is a chamber below the
filter bed B, and a is a chamber above the said filter bed. and at are respec-
tively a deflecting plate and a baffle hood situated in the chamber a² of the filter.
is a vertical stand pipe which passes through the filter bed B and connects the
chambers a¹ and a². C is a fluid inlet pipe to the filter, and D is the outlet pipe
for filtered liquid. d is a collecting pipe which is situated in the lower part of
the filter bed and is connected to the outlet pipe D. dare collecting cups
which project from the pipe d into the filter bed. is a flap valve in the
pipe and is a hole or aperture in the flap valve . is a byepass adjust-
able by means of a valve and may be used in place of the hole in the
flap valve if required. E is a waste pipe leading from the chamber a. f is a
valve, f¹ is a spring which tends to hold the valve f to its seat, and is a screw
by the adjustment of which the compression of the spring f and consequently
the load on the valve f may be regulated. G is a pipe connecting the valve f
with the inlet side of the filter. His a chamber arranged to receive any liquid
passing through the valve f. I is a float chamber arranged below the chamber H,
and h is a syphon adapted to rapidly transfer the liquid contents of the chamber H
into the chamber I. is a float which is situated in the chamber I and is pro-
vided with a stem or rod i¹. 22 is a syphon for emptying the float chamber I.
is a valve or cock by the adjustment of which the action of the syphon can
be regulated so as to empty the float chamber I more or less rapidly. The
syphon and valve 3 may be replaced by an adjustable sluice if required. J is
a slide valve cylinder or chamber connected by a port with the inlet pipe C.
C is a pipe connecting a port c¹ in the cylinder J with the chamber «'.
j is a
piston valve arranged so as to be capable of sliding in the cylinder J. The
valve consists of two dises or junks having an annular recess between
them. K is a closed cylinder in which a piston k is adapted to slide. è is a valve

page_text: controlling the outlet of the waste pipe E. ³ is a rod connecting the slide valvej,
the piston and the valve e.
M is a four way cock and m is the lever by which the cock M is turned. m³ and
m² are passages respectively connecting the opposite ends of the cylinder K with
the cock M. m³ is the pressure inlet pipe to the cock M and m is the exhaust
pipe leading from the cock M. The pipe m³ may communicate with the inlet
pipe C, or with other suitable fluid pressure source. O is a rod connecting the
lever m with one end of a lever P. The other end of the lever P is pivoted to
the front chamber I. The stem of the float i is attached to the lever P by a
pin and slot connection.
Qis a float situated in the chamber a³. q is a rod connecting the float Q to a
valve g. is a seat for the valve 2, 3 is an opening or port in the casing A,
controlled by the valve g
The filter operates as follows:-The tension of the spring f' is adjusted so as
to keep the valve f closed to its seat against the pressure of the liquid in the
inlet chamber when the filter bed is clean. When the filter bed B is clean,
the chambers H and I are empty, the four way cock M and the valves and e
are in the positions shown, and the upper side of the piston k is open to the
fluid pressure through the pipe m³, the four way cock M and passage m², whilst
the lower side of the piston k is open to exhaust through the passage m³, four
way cock M and pipe m². The liquid to be filtered passes through the pipe C,
port c, the annular passage in the valve j, port c', and pipe C¹ to the chamber a',
and thence up through the stand pipe into the chamber and down through
the filter bed, the filtered water being then collected by the cups and con-
ducted by the pipe 1) to a suitable receiving vessel or reservoir. The pressure of
the filtered water is sufficient to raise and pass by the flap valve .
When the filter bed becomes foul, it offers a greater resistance to the passage
of the liquid to be filtered, so that the pressure in the chambers a and a is
increased. This increased pressure is communicated by the pipe G to the valve f
and when the said pressure becomes sufficient to overcome the load exerted by the
spring f on the valve f, the latter is raised and liquid passes from the chamber a²
through the pipe G and valve f into the chamber H. When the chamber H is
filled to the required point, the syphon comes into operation and rapidly trans-
fers the liquid from the chamber H to the chamber I, thereby raising the float i,
rod , lever P and connecting rod O.
This operates the lever m and turns the four way cock M, thereby opening the
lower side of the piston to the fluid pressure through the passage mand
pipe m³, and putting the upper side of the piston to exhaust through the
passage m² and pipe m. The piston k is thereby raised and as it is fixed to the
valve rod 3, the valve i will be also raised so as to close the communication
between the ports c and c, and to open the waste valve e. The filtered liquid
then flows back through the pipe D, and entering the filter bed B through the
cups loosens and washes the filtering medium, overflows into the stand
pipe and then passes away through the waste pipe E, carrying the impurities
with it.
When the flow of liquid through the filter is thus reversed the pressure within
the filter is reduced and the valve f is again closed by the spring fl; and when
the chamber I has been emptied by the syphon 23, the float i will fall, thereby again
reversing the four way cock M to the position shown in Figure 1 and permitting
the filtering operation to proceed.
Although liquid may only escape slowly through the valve f, yet, owing to the
fact that the syphon h rapidly transfers the contents of the chamber H to the
chamber I. the float i is rapidly raised and the action of the filter is reversed by
a quick and decisive movement of the four way cock M.
The length of time for which the cleansing or reversed flow of liquid is per-
mitted to pass through the filter obviously depends upon the length of time that

page_text: the float i remains raised. This can be regulated by adjusting the cock as
aforesaid to cause the syphon to empty the chamber I more or less rapidly.
It is not advisable that the force of the reversed or cleansing flow of liquid
through the filter should be so great as to wash away some of the filtering
medium into the waste pipe. To obviate this the filtered liquid, when reversed,
closes the valve and can then pass only through the passage which is of
less sectional area than that of the pipe D and therefore checks the backward
flow of the filtered liquid. Or the valve may be made without the hole in which
case the backward flow of liquid closes the valve and the liquid can then only
pass back through the restricted byepass which checks the flow. It is only
necessary to employ the valve when the filter is working against a considerable
head of pressure.
The float Q is kept in its raised position by the liquid in the filter while filter-
ing is proceeding, and the valve qi is held to its seat q³. When the supply inlet
is closed and the waste is opened as above described, however, the pressure within
the filter is reduced and the level of liquid in filter is lowered, thereby permitting
the float Q to fall, thus opening the valve q¹ and permitting the external atmos-
pheric air to enter the filter through the openings or ports q³.
In the above described form of filter it is obvious that the valve f might be
replaced by a pipe connected to the inlet side of the filter and having its mouth
or outlet situated at such a level that when the filter bed is foul the increase in
pressure on the intet side of filter forces liquid up said pipe and causes it to
overflow into the ehamber H.
Referring to the construction shown in Figures 2 and 3, A is the filter casing
as before. The filter bed B rests upon a perforated plate or its equiva-
lent a. The pipe C communicates with the cylinder J by the port e as before.
The pipe C connects the port c¹ with the chamber a². The outlet pipe D for the
filtered liquid leads from the filter chamber a¹ to a port d in the valve cylinder J.
D' is a pipe connecting a suitable port in the lower end of the cylinder J with
the filtered liquid reservoir or receiver. E¹ is a waste pipe leading from a suit-
able port in the upper end of the cylinder J.
The chambers H and I, the syphon h, the float i, float stem i¹, syphon 2, cock,
lever P connecting rod 0, cock M, lever m, passages m' and m³, pipes m³ and m²,
and pistons and k, are arranged as previously described.
The valve is in this case constructed as an equilibrium valve as follows:-
the valve f, provided with a suitable seat, has a stem f³, which passes fluid tight
through a chamber f* and then through a closed cylinder f* and has its upper
end attached to one end of a rocking lever f. This rocking lever fo is pivoted
at f to an arm projecting from the cylinder f' and has its other end attached to
one end of the spring f¹. The other end of the spring f is secured to an arm f
which projects from the cylinder f. ff are nuts for adjusting the tension of
the spring f. f is a piston which is capable of sliding in the cylinder f and is
fixed to the valve stem f³. R is a pipe connecting the chamber of the filter
with the upper end of the cylinder f, and S is a pipe connecting the chamber a
of the filter with the lower end of the cylinder f T is a liquid supply pipe
connecting the valve chamber f* with any suitable source of liquid.
The lower end of the rod outside the cylinder K, is connected by means of
connecting rods N, N¹, to one end of a rocking lever U which is pivoted at u to
an arm depending from the casing of a valve V.
The stem of the valve V is connected to the lever U at a point between the
pivot and the rod N, by a pin and slot connection. The other end of the
lever U is provided with a weight W which tends to close the valve V. The
valve V controls the supply of steam through a pipe to an air or other gas
blower or injector X preferably of the Körting type. a is a pipe controlled by a
spring valve 2 and connecting the blower X to a perforated pipe situated
in the chamber a³ of the filter.

page_text: The float valve Q is constructed and operated substantially as above described
with reference to Figure 1.
It is obvious that, in order that the filtering may proceed, the pressure in the
chamber a into which the liquid to be filtered flows, must be greater than the
pressure in the chamber a¹ from which the filtered liquid is withdrawn. The
pressure conveyed through the pipe R and acting on the upper side of the piston f³,
is therefore greater than the pressure conveyed through the pipe S and acting
upon the lower side of the piston f. This difference between the pressures on
the respective sides of the piston f is counteracted when the filter bed B is clean,
by the spring f which tends to hold the valve f to its seat. The tension of
the spring can be adjusted as required. The chambers H and I are then
empty, the valve Vis closed, and the valves f, and and the cock M are in the
positions shown in Figure 2; the upper side of the piston K being open to
exhaust and the lower side of the piston K being open to fluid pressure. The
liquid to be filtered then enters the cylinder J by the port c, passes round the
annular passage in the valve j and thence through the port c' and pipe C to the
chamber a of the filter. The liquid then passes through the filter bed B, into
the chamber and then through the pipe D and port into the lower end of
the cylinder J below the valve j. From this lower end of the cylinder J the
filtered liquid is conveyed by the pipe D¹ to the filtered liquid reservoir, reser-
voirs or receivers or point where it is utilised. When the filter bed becomes
foul, increased pressure is required to force the liquid through the filtering
medium, so that the pressure in the chamber a increases, while the pressure in
the chamber a¹ on the outlet side of the filter bed does not increase from this
cause. The pressure conveyed through the pipe R and acting on the upper face
of the piston f is therefore increased whilst the pressure conveyed through the
pipe S and acting on the lower face of the piston fo is not increased. When this
increase in pressure in the chamber reaches a given amount, (which amount is
determined by the degree of tension of the spring f) the piston f and valve
stem are lowered, the valve f opened, and liquid permitted to pass from the
pipe T into the chamber H. The syphon h, float and lever P are operated as
previously described; the connection rod 0 and lever m are raised, and the
cock M is reversed, thereby opening the upper end of the cylinder K to fluid
pressure through the passage m³ and pipe m³, and putting the lower side of the
cylinder K to exhaust through the passage m¹ and pipe m. This lowers the
piston k, the rods 13, N and N¹, opens the steam valve V, and reverses or lowers
the valve thereby closing the pipe D' which connects the ports c and d', and
connecting the port c¹ to the pipe E¹. When the valve j is thus lowered, the
unfiltered liquid passes through the pipe C, port c, annular passage in the valve j,
port, and pipe D to the chamber, thence up through the filter bed B into
the chamber a, and then through the pipe C and top of the cylinder J to the
waste pipe El. The valve V being open admits steam to the injector or blower X
and the blast of air or other gas thereby induced, passes through the pipe.
raises and passes the valve a¹ into the pipe and thence passes through the filter
bed thoroughly breaking it up, and escapes through the valve q' and also the
pipe C and top of the cylinder J to the drain pipe E. When the chamber I is
emptied by the syphon, the float i falls and the cock M is again reversed so
as to open the lower side of the piston to fluid pressure and to put the upper
side of the piston k to exhaust, thereby raising the valve j and closing the valve V,
as in Figure 2, and permitting the filtering operation to again proceed.
It is obvious that instead of operating the valve V of the. steam pipe, the
rods N N or their equivalent may be adapted to operate a valve controlling a pipe
leading from a source of air or gas under pressure to the valve ¹.
Any increase in the pressure on the outlet side of the filter due to a back flow of
filtered liquid or a stoppage or partial stoppage of the filtered liquid outlet, only
serves to increase the load on the equilibrium piston f³. This form of my inven.
.

page_text: tion is therefore specially adapted for filters where the filtered liquid outlet is
conducted to two or more receivers or reservoirs; for should the supply pipe to a
part or all of these reservoirs be closed, the increase in pressure in the said pipe,
due to this cause, would be communicated to both sides of the filter and the
equilibrium of the forces controlling the piston f8 would not be thereby disturbed,
and no washing of the filter bed, due to this increase of pressure, could take place.
Referring to Figures 4 and 5 M³, M³, are passages in the four way cock M.
m³ is the fluid pressure pipe, m is the exhaust pipe, and m¹ and m* are the
passages leading from the cock M to the respective ends of the cylinder K. In
these figures the cock 3 is shown as putting the lower end of the cylinder K to
exhaust through the passages m¹, M, and the pipe m', and opening the upper
end of the cylinder K to fluid pressure, through the pipe m³, and passages M², m³.
Upon turning the cock through an angle of 90 degrees, the upper end of the
cylinder K will be put to exhaust and the lower end of the said cylinder will
be opened to fluid pressure.
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 in a filter is:-
1. The utilization of the variations in the difference of pressure between the
inlet and outlet sides of the filter bed, for reversing the direction of the flow of
Tiquid through the filter bed, for the purpose specified.
2. The utilization of the variations in the pressure on the inlet side of the
filter bed, or of variations in the difference of pressure between the inlet and
outlet sides of the filter bed, for forcing a blast of air steam or other gas through
the filtering medium at such times only as the filter bed requires cleansing,
for the purpose specified.
3. The syphon or outlet provided with an adjusting cock or sluice for regulating
the time during which the cleansing operation continues, substantially as
described.
4. The combination with the valve operated by variations in the pressure on
the inlet side of the filter bed or by variations in the difference of pressure
between the inlet and outlet sides of the filter bed, of a float operated by the
liquid escaping through said valve, substantially as and for the purpose specified.
5. The combination of the valve operated by variations in the pressure on the
inlet side of the filter bed or by variations in the difference of pressure between
the inlet and outlet sides of the filter bed, the syphon chamber, the float chamber,
the syphon connecting said chambers, the float and means operated by said float
for reversing the flow of liquid through the filter or for forcing a blast of air,
steam or other gas through the filter bed when the latter is foul, substantially as
and for the purpose specified.
6. A perforated flap valve or an adjustable bye pass for checking the backward
flow when the direction of the flow of liquid is reversed for cleansing purposes,
substantially as and for the purpose specified.
7. A filter constructed arranged and operating substantially as described with
reference to one or other of the forms or modifications shown in the accompanying
drawings, for the purpose specified.
Dated th: 01-1
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.