Improvements in Steam Boiler Furnaces.
Year: 1897

page_text: Date of Application, 9th Feb., 1897.
Complete Specification Left, 8th Nov., 1897-Accepted, 5th Feb., 1898
[Communicated from abroad by EDWARD BENJAMIN PARKHURST, of 19, Green Street,
in the City of Woburn, County of Middlesex, and State of Massachusetts, United
States of America, Mechanical Engineer.]
Improvements in Steam Boiler Furnaces.
7
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,.
45, Southampton Buildings, in the County of Middlesex, do hereby declare the nature
of this invention to be as follows:-
My invention has for its object to provide an improved boiler furnace which
shall be of high efficiency in forming steam, and also economical in the consumption.
of fuel, and it consists in a boiler furnace constructed as hereinafter set forth.
In the following description reference is made to the accompanying drawings in
which Fig. 1 is a vertical central lengthwise section showing a horizontal boiler
and its internal furnace embodying my invention. Fig. 2 is a front elevation with
one-half in section, the section being on the line 2-2 Fig. 1. Fig. 3 is a vertical
section, the right half being on line 3-3 Fig. 1, and the left half being on line 44
of said figure. Figs. 4, 5, 6 and 7 are details showing modifications, reference to
which is hereinafter made. Fig. 8 is a detail of the slide damper employed in
the modification shown Fig. 7. Fig. 9 is a detail hereinafter referred to. Figs. 10,
11, 12 and 13 show a modification in which the furnace is outside of the boiler.
Fig. 10 is a side elevation, Fig. 11 is a front elevation partly in section, Fig. 12 is a
horizontal section on line 12-12 of Fig. 10, and Fig. 13 is a vertical section on
line 13-13 of Fig. 10. Fig. 14 is a modification showing my invention applied to
a water tube boiler. Fig. 15 is a section on line 15-15 of Fig. 14.
A represents a horizontal boiler of common form, having what is frequently termed
an internal fire box or furnace. An upper series of grate bars is shown at 3. Each
of such bars consists of a tube and a series of said tubes placed side by side, as
shown Fig. 2, forms the upper grate. The grate bars or tubes 3 are slightly inclined,
the rear ends thereof being somewhat higher than the forward ends thereof, as shown
Fig. 1.
The said rear ends of said grate tubes are connected each with a
connection 30, the upper ends of said connections entering the crown sheet and thus
connecting with the water space of the boiler above the crown sheet. The forward
ends of said grate tubes 3 enter a manifold D which is of the shape shown Figs. 1
and 2, and which is supported upon feet 4 which latter rest preferably upon the
metal strip or plate 5 extending across the floor of the ash-pit from side to side
thereof. The water box D crosses the front of the furnace horizontally and consists
of two portions namely an upper portion 6 into which the forward ends of the upper
grate bars 3 enter, as previously described, and a lower portion 7 into which the
forward ends of the lower grate bars 9 enter. The upper and lower portions 6 and 7
of said water box or manifold are connected by vertical portions 8, preferably
three in number so spaced as to leave openings between the said vertical portions
opposite the tubes of the lower grate to permit the placing of fuel on said grate.
The lower grate bars 9 preferably are placed parallel with the upper grate bars as

page_text: shown and the rear ends of said lower grate bars are connected by means of bent
connections or elbows 20 with vertical connecting pipes 10, the upper ends of which
enter the three-way elbows 21 by means of which the rear ends of the upper grate
The radial connections 30
bars are connected with the radial connections 30.
may, therefore, be considered as extensions of the vertical connecting pipes 10.
The lower grate bars preferably are set close together and it is therefore undesirable
to locate the vertical connections 10 in the same transverse plane, since if they were
so located there would not be sufficient space between them to accommodate the
draft from the upper and lower grates. To avoid placing these connections in the
same plane, I make each alternate lower grate tube 9 somewhat longer than the other
tubes of the series forming the lower grate so that the connections 10 will occupy
two transverse planes, the connections for the shorter grate tubes being in one plane
and those for the longer ones being in another plane. That is, the vertical
connections of the longer grate tubes are set in a line a short distance behind the one
formed by the connections of the shorter grate tubes, as will be clear from Fig. 1.
To facilitate the connection of these longer tubes of the lower series and their vertical
connections 10 with the boiler spaces above the crown sheet, the corresponding grate
bars or tubes of the upper grate are also correspondingly extended and the radial
connections 30 for these longer grate tubes are also set rearwardly of the radial
<connections for the shorter upper grate tubes, as will be clear. By this arrangement
sufficient spaces are obtained between the vertical connections. 10 to permit the
-combined draft of the upper and lower grates to pass rearwardly between said
, connections. To prevent the draft from the upper grate passing between the
connections 30, I place a partition or wall 35 of fire brick, or similar heat resisting
material across the furnace in front of the said connections 30 and between the rear
ends of the upper grate tubes and the crown sheet. This partition may be of any
well known material and may be constructed in any well known manner. By the
employment of a bent connection or elbow to join the rear end of each of the lower
grate bars 9 with its vertical connection 10 a saving in cost is effected over the
employment of a manifold or water box at the rear ends of the lower grate bars, and
in like manner,
the employment of the three-way elbows 21 and the radial
connections 30 in place of a water leg or similar device is of considerable advantage in
saving expense in construction, as also in the cost of cleaning and repairs, while at
the same time a better and more rapid circulation of the water through the grate
tubes is obtained. The bent connections or elbows 20 and 21 are also preferable to a
manifold or water leg in that they do not afford an opportunity for the collection of
-sediment. The vertical connections 10 between the rear ends of the lower grate
bars 9 and the three way elbows 21 are important in increasing the circulation of the
boiler, since the water in these vertical pipes 10 is exposed to the fiercest heat of the
fire, and a rapid circulation is thus ensured. The water box or manifold D is supplied
with water from the coolest water in the boiler, preferably by means of supply
pipes 12 which latter connect the lower portions of said manifold with the lowest
portion of the boiler at the rear of the ash-pit or fire chamber. The water circulates
from the coolest portion of the boiler through the supply pipes 12, of which there are
preferably three, as shown Fig. 2, to the manifold or water box D. Thence either
through the lower grate bars 9 and vertical connections 10 to the radial connections 30,
or through the upper grates 3 to the said radial connections 30 and thence through
said connections 30 to the hottest water above the crown sheet.
For the purpose of causing the draft to pass upwardly through the lower grate and
of preventing it from passing below and behind the said grate, I provide a supporting
piece 13 which is of the L-shape in cross-section shown Fig. 1, and which extends
across the furnace from side to side of the ash-pit and is secured at each end thereof
I fill the interior of this
to the side of the ashpit in any well known manner.
support 13 with fire brick or other fire-resisting material and thus form a durable
partition across the furnace below the bent connections 20 and between said
connections and the supply-pipes 12, there being only sufficient space between the
said supply pipes and the bottom of the supporting piece 13 to accommodate a

page_text: damper 15 which is formed preferably from sheet iron or the like. The damper 15
is arranged to slide on top of the said supply pipes 12 and between said pipes and
the supporting piece 13. The said damper 15 extends from side to side of the furnace -
and rearwardly to the rear wall of the ash-pit and serves in connection with the
supporting piece 13 to prevent the draft from passing below and behind the lower
grates. The draft is therefore forced to pass upwardly through the said lower grate
and between the vertical connections. 10. As ashes and the like will collect on the
damper 15 the construction above described is provided to permit the said damper to
be slid forward toward the front of the furnace by the use of a poker or similar`
device, the front edge of said damper being provided with a projection or eye by
means of which it may be drawn forward by the aid of the poker. As the damper is
drawn forward the ashes or other material which have collected upon it will be forced
off and will drop into the ash-pit from whence they may be readily removed. At 221
are shown projections which preferably are integral with the front plate of the
furnace and which extend slightly over the front edge of similar projections on the
manifold or water box D. The projections 221 are located just below each fuel door
and serve to prevent any fuel from getting into the space in front of the manifold
or water box D. The stack or flue is shown at 23 and may be of any well-
known construction. In the drawings various other parts of the boiler are shown
which I do not deem it necessary to describe, inasmuch as their construction is.
familiar to all skilled in the art.
At Fig. 9 a modification is shown in which the upper ends of the radial connections 30
instead of entering the crown sheet direct are connected by means of bent
connections 36 with horizontal connections 37 which enter the tube sheet at the
rear of the furnace as shown. By this construction an extension of the heating
surface is obtained, while the rapidity of the circulation is not interfered
with.
The closure device consisting of the supporting piece 13 and damper 15, above
described, by means of which the draft is prevented from passing below and behind.
the lower grate, may be variously modified. In Figs. 4 to 8 inclusive I have shown
several forms of the closure device above described for preventing the draft of the
lower grate from passing below and behind said grate. In Fig. 4 the supporting
piece 13 is employed in substantially the same manner as in Fig. 1, and as previously
described. In the modification shown in the said figure, however, the presence of
supply pipes 12 passing underneath the said supporting piece 13 is not contemplated,
such supply pipes being otherwise located, thus leaving the entire space below the
supporting piece 13 down to the floor of the ash-pit free. The form of damper
employed, however, may be such as is shown in said figure at 50. This damper is
pivoted at its upper edge in any suitable manner to the under side of the support 13.
When closed it occupies a substantially vertical position, and it may be opened or
swung up into the dotted line position shown, for the purpose of cleaning out that
part of the ash pit which is located rearwardly of it.
In the modification shown Fig. 5, the damper 51 occupies when closed a horizontal
position being pivoted at its rear edge in any well known manner and being provided
with an arm 60, indicated in dotted lines, with which a slide rod 61 is connected
which projects forwardly to the front of the furnace and is provided with a handle 62
by means of which the said rod may be drawn forward when it is desired to swing the
damper down into the vertical position indicated by the dotted lines 63. By this
contrivance the damper may be readily operated to allow ashes and the like which
O collect thereon to drop down into the ash pit.
The modified construction shown Fig. 6 differs only in the method of constructing
and operating the damper. In this construction the damper 55 is pivoted centrally
at each end by means of a rod to which the damper is secured, the rod being.
journalled at each side of the furnace, and at one end being extended and being
provided outside the furnace with a handle whereby the damper may be swung
through a quarter of a revolution in order to dump the ashes which may have
collected thereon into the ash pit.

page_text: Fig. 7 shows another modified form which in place of the damper 55 employed in:
the form previously described employs a slide damper which is shown in plan view at
Fig: 8, and which is composed of a stationary slotted plate secured between the brick
work at the rear of the furnace and the lower rear edge of the support 13 and a
correspondingly slotted sliding part provided with a handle 56 which projects to the
outside of the furnace so that the damper slide may be reciprocated in order to allow
the ashes thereon to drop through to the ash-pit.
I prefer to make the upper, grate tubes 3 of smaller diameter than the lower grate
tubes 9, without, however, increasing the number, the axis of each upper grate tube.
being preferably, though not essentially, in the same vertical plane as one of the
lower grate tubes, thereby giving a wider opening between the peripheries of the
upper tubes than between the lower tubes. By this construction the coarser pieces
of fuel will remain on the upper grate until reduced by burning, while the finer
pieces will fall through the openings on to the lower grate.
In the modification shown in Figs. 10-13, I have shown my invention as:
applied to. a boiler having no internal fire box, the furnace being entirely outside
of the boiler. The upper and lower grate tubes are connected with the radial
connections. 31 in similar way to that already described for connecting the grate
tubes with the radial connections 30. In the former case, however, the connections 30.
being within the boiler radiated outwardly while in the modified form shown in.
Figs. 10-13 the connections 31 radiate inwardly, passing through the shell E and
connecting with the water space of the boiler. The water box consists of the upright
portion F leading into the boiler, and two horizontal portions F1 F2 one upper
and one lower, into which respectively the upper and lower grate tubes enter.
A modified form. of the damper 55 previously described is employed in Fig. 10,
consisting of a slide 71, operated by a handled rod 72 from the front of the furnace.
In the modification shown in Figs. 14 and 15, the upright connections 35 which
correspond with the connections 30 Fig. 1 are entered directly into the tubes 36..
Dated this Oth daw of Tha
1007
improvements in Steam Bоller Furnaces..
I, HENRY HARRIS LAKE, of, the. Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, 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 object to provide an improved boiler furnace which shall
be of high efficiency in forming steam; and also economical in the consumption of
fuel, and it consists in a boiler furnace constructed as hereinafter set forth, and the
novel features of which are particularly pointed out and clearly defined in the claims
at the end of this specification.
In the following. description reference is made to the drawings filed with my
Provisional Specification, in which
Fig. 1 is a vertical central lengthwise section showing a horizontal boiler and its
internal furnace embodying my invention.
Fig. 2 is a front elevation with one-half in section, the section being on the
line 2-2, Fig. 1.
Fig. 3 is a vertical section; the right half being on line 3-3; Fig. 1, and the left
half being on line 4-4 of said figure.

page_text: Figs. 4, 5, 6. and 7 are details showing modifications, reference to which is..
hereinafter made.
Fig. 8 is a detail of the slide damper employed in the modification shown Fig. 7.
Fig. 9 is.a.detail hereinafter referred to.
Figs. 10, 11, 12 and 13 show a modification in which the furnace is outside of the
boiler. Fig. 10 is a side elevation, Fig: 11 is a front elevation partly in section,
Fig. 12.is a horizontal section on line 12-12 of Fig. 10, and Fig. 13-is a vertical :
section on line 13-13 of Fig. 10.
:
.
Fig. 14 is a modification showing my invention applied to a water tube boiler.
Fig. 15 is.a. section on line 15-15 of Fig. 14.
A represents a horizontal boiler of common form, having what is frequently termed
an internal fire box, or furnace. An upper series of grate bars is shown at 3. Each
of such bars consists of a tube and a series of said tubes placed side by side, as shown.
Fig. 2; forms the upper grate: The grate bars. or tubes 3 are slightly inclined, the.
rear ends. thereof being somewhat higher than the forward ends thereof as shown
Fig. 1. The said rear ends of said. grate tubes are connected each with a
connection 30; the upper ends of said connections entering the crown sheet and thus
connecting with the water. space. of the boiler above the crown sheet. The forward.
ends of said grate tubes. 3 enter a manifold or water box D which is of the shape
shown. Figs. 1 and 2, and which is. supported upon feet 4 which latter. rest
preferably upon the metal strip or plate 5 extending across the floor of 'the ash-pit
from side to side thereof. The water box D crosses the front of the furnace
horizontally and consists of two portions, namely an upper portion 6 into which the
forward ends of the upper grate bars. 3 enter, as previously described; and a lower
portion 7 into which the forward ends of the lower grate bars 9: enter: The upper
and lower portions 6 and 7 of said water box or- manifold are connected by vertical
portions 8, preferably three in number, so.spaced as to leave openings between the.
said vertical portions opposite the tubes of the lower grate to permit the placing of
fuel on said grate. The lower grate bars 9 preferably are placed parallel with the
upper grate bars as shown, and the rear ends of said lower grate bars are connected.
by means of bent connections or elbows. 20 with vertical connecting pipes. 10, the
upper ends of which enter the three-way elbows 21 by means of which the rear.
ends of the upper. grate bars are connected with the radial connections 30. The
radial connections. 30 may, therefore, be considered as extensions of the vertical:
connecting pipes 10. The lower grate bars preferably are set close together and it
is therefore, undesirable to locate the vertical connections 10 in the same transverse
plane, since if they were so located there would not be sufficient space between them.
to accommodate. the draft from the upper and lower grates. To avoid placing these
connections in the same plane; I make each alternate lower grate tube 9 somewhat.
longer than the other tubes of: the series forming the. lower grate, so that: the
connections 10. will occupy two transverse planes, the connections. for the shorter
grate tubes being in one plane and those for the longer ones being in another
plane. That is, the vertical connections of the longer grate tubes are set in a line
a short distance behind the one formed by the connections of the shorter grate
tubes, as will be: clear from Fig. 1. To facilitate the connections of these longer.
tubes of the lower series and their. vertical connections. 10 with the boiler spaces
above the crown sheet, the corresponding grate bars or tubes of the upper grate
are also correspondingly extended and the radial. connections 30 for: these. longer
grate tubes are also set rearwardly of the radial connections for the shorter upper
grate tubes, as will be. clear.. By this arrangement sufficient spaces are obtained
between the vertical connections 10 to permit the. combined draught of the upper
and lower grates to pass rearwardly between said connections. To prevent the draft
from the upper grate passing between the connections 30, I place a partition or
wall 35 of fire brick, or similar heat-resisting material across the furnace in. front
of the said connections 30 and between the rear. ends of the upper grate tubes. and:
the crown sheet. This partition may: be of; any well known: material and may be
constructed in any well known manner. By the employment of a bent connection

page_text: or elbow to join the rear end of each of the lower grate bars 9 with its vertical
connection 10 a saving in cost is effected over the employment of a manifold or
water box at the rear ends of the lower grate bars, and in like manner, the employ-
ment of the three-way elbows 21 and the radial connections 30 in place of a water leg
or similar device is of considerable advantage in saving expense in construction, as
also in the cost of cleaning and repairs, while at the same time a better and more
rapid circulation of the water through the grate tubes is obtained. The bent
connections or elbows 20 and 21 are also preferable to a manifold or water leg in
that they do not afford an opportunity for the collection of sediment. The vertical
connections 10 between the rear ends of the lower grate bars 9 and the three-way
elbows 21 are important in increasing the circulation of the boiler, since the water
in these vertical pipes 10 is exposed to the fiercest heat of the fire, and a rapid
circulation is thus ensured. The water box or manifold D is supplied with water
from the coolest water in the boiler, preferably by means of supply pipes 12, which
latter connect the lower portions of said manifold with the lowest portion of the
boiler at the rear of the ash-pit or fire chamber. The water circulates from the
coolest portion of the boiler through the supply pipes 12, of which there are preferably
three, as shown Fig. 2, to the manifold or water box D. Thence either through the
grate bars 9 and vertical connections 10 to the radial connections 30, or through the
upper grates 3 to the said radial connections 30 and thence through said con
nections 30 to the hottest water above the crown sheet.
For the purpose of causing the draft to pass upwardly through the lower grate
and of preventing it from passing below and behind the said grate, I provide a
supporting piece 13 which is of L-shape in cross-section as shown in Fig. 1, and which
extends across the furnace from side to side of the ash pit and is secured at each end
thereof to the side of the ash-pit in any well known manner. I fill the interior of this
support 13 with fire brick or other fire-resisting material and thus forma durable partition
across the furnace below the bent connections 20 and between said connections and
the supply pipes 12, there being only sufficient space between the said supply pipes
and the bottom of the supporting piece 13 to accommodate a damper 15 which is
formed preferably from sheet iron or the like. The damper 15 is arranged to slide
on top of the said supply pipes 12 and between said pipes and the supporting piece 13.
The said damper 15 extends from side to side of the furnace and rearwardly to the
rear wall of the ash-pit and serves in connection with the supporting piece 13 to
prevent the draft from passing below and behind the lower grates. The draft is
therefore forced to pass upwardly through the said lower grate and between the
vertical connections 10. As ashes and the like will collect on the damper 15 the
construction' above described is provided to permit the said damper to be slid
forward toward the front of the furnace by the use of a poker or similar device, the
front edge of said damper being provided with a projection or eye by means of
which it may be drawn forward by the aid of the poker. As the damper is
drawn forward the ashes or other material which have collected upon it will be
forced off and will drop into the ash-pit from whence they may be readily removed.
At 221 are shown projections which preferably are integral with the front plate of the
furnace and which extend slightly over the front edge of similar projections on
the manifold or water box D. The projections 221 are located just below each fuel
door and serve to prevent any fuel from getting into the space in front of the
manifold or water box D. The stack or flue is shown at 23 and may be of any
well known construction. In the drawings various other parts of the boiler are
shown which I do not deem it necessary to describe, inasmuch as their construction
is familiar to all skilled in the art.
At Fig. 9.a modification is shown in which the upper ends of the radial connections 30
instead of entering the crown sheet direct are connected by means of bent connections 36
with horizontal connections 37 which enter the tube sheet at the rear of the furnace
as shown. By this construction an extension of the heating surface is obtained,
while the rapidity of the circulation is not interfered with.
The closure device consisting of the supporting piece 13 and damper 15, above

page_text: described, by means of which the draft is prevented from passing below and behind
the lower grate, may be variously modified. In Figs. 4 to 8 inclusive I have shown
several forms of the closure device above described for preventing the draft of the
lower grate from passing below and behind said grate. In Fig. 4 the supporting piece 13
is employed in substantially the same manner as in Fig. 1, and as previously
described. In the modification shown in the said figure, however, the presence of
supply pipes 12 passing underneath the said supporting piece 13 is not contemplated,
such supply pipes being otherwise located, thus leaving the entire space below the
supporting piece 13 down to the floor of the ash-pit free. The form of damper
This damper is
employed, however, may be such as is shown in said figure at 50.
pivoted at its upper edge in any suitable manner to the under side of the support 13.
When closed it occupies a substantially vertical position, and it may be opened or
swung up into the dotted line position shown, for the purpose of cleaning out that
part of the ash-pit which is located rearwardly of it.
In the modification shown Fig. 5 the damper 51 occupies when closed a horizontal
position being pivoted at its rear edge in any well known manner and being provided
with an arm 60 indicated in dotted lines, with which a slide rod 61 is connected
which projects forwardly to the front of the furnace and is provided with a handle 62
by means of which the said rod may be drawn forward when it is desired to swing
the damper down into the vertical position indicated by the dotted lines 63. By
this contrivance the damper may be readily operated to allow ashes and the like
which collect thereon to drop down into the ash pit.
The modified construction shown Fig. 6 differs only in the method of construction
and operating the damper. In this construction the damper 55 is pivoted centrally
at each end by means of a rod to which the damper is secured, the rod being
journalled at each side of the furnace, and at one end being extended and being pro-
vided outside the furnace with a handle whereby the damper may be swung through
a quarter of a revolution in order to dump the ashes which may have collected thereon
into the ash-pit.
Fig. 7 shows another modified form which in place of the damper 55 employed in
the form previously described employs a slide damper which is shown in plan view at
Fig. 8, and which is composed of a stationary slotted plate secured between the
brick work at the rear of the furnace and the lower rear edge of the support 13 and
a correspondingly slotted sliding part provided with a handle 56 which projects to
the outside of the furnace so that the damper slide may be reciprocated in order to
allow the ashes thereon to drop through to the ash-pit.
I prefer to make the upper grate tubes 3 of smaller diameter than the lower grate
tubes 9, without, however, increasing the number, the axis of each upper grate tube
being preferably, though not essentially, in the same vertical plane as one of the
lower grate tubes, thereby giving a wider opening between the peripheries of the
upper tubes than between the lower tubes. By this construction the coarser pieces
of fuel will remain on the upper grate until reduced by burning, while the finer
pieces will fall through the openings on to the lower grate.
In the modification shown in Figs. 10-13 I have shown my invention applied to
a boiler having no internal fire box, the furnace being entirely outside of the boiler.
The upper and lower grate tubes are connected with the radial connections 31 in
similar way to that already described for connecting the grate tubes with the radial
connections 30. In the former case, however, the connections 30 being within the
boiler radiated outwardly while in the modified form shown in Figs.. 10-13 the con-
nections 31 radiate inwardly passing through the shell E and connecting with the
water space of the boiler. The water box consists of the upright portion F leading
into the boiler, and two horizontal portions F1 F2 one upper and one lower into which
respectively the upper and lower grate tubes enter.
A modified form of the damper 55 previously described is employed in Fig. 10,
consisting of a slide 71 operated by a handle rod 72 from the front of the furnace.
In the modification shown in Figs. 14 and 15 the upright connections 35 which
correspond with the connections 30, Fig. 1, are connected directly to the tubes 36.

page_text: Having now particularly ascertained and described the nature of my said invention
and in what manner the same is to be performed, as communicated to me by my
foreign correspondent, I declare that what I claim is :-.
1. The herein described upper and lower water grate boiler furnace having the
series of tubes of the upper water grate connected at their rear ends with the
water space of the boiler by independent connections for the respective tubes, also
having the rear ends of the tubes of the lower water grate connected by a series of
independent connections with the water space of the boiler, and also having the
diameter of the upper grate tubes less than the diameter of the lower grate tubes,
and the spaces or intervals between the axes of the tubes of the upper series the
same as the spaces or intervals between the axes of the tubes of the lower series.
2. The movable closure device located at the rear of the lower water grate tubes
and closing the space between the rear ends of the said tubes and the adjacent
surface of the furnace chamber, whereby the draft of the lower grate is prevented
from passing below and behind said grate and is caused to pass upwardly through
the same, and whereby also said closure device may be opened in order to permit
cleaning behind the same.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant..