Improvements in Ventilators.
Year: 1891

page_text: Date of Application, 12th Oct., 1891
Complete Specification Left, 7th June, 1892-Accepted, 30th July, 1892
PROVISIONAL SPECIFICATION.
Improvements in Ventilators.
FREDERIC WILLIAM BARKER, 7, Ferndale Road, Liverpool, Heating &
Ventilating Engineer, do hereby declare the nature of this invention to be as
follows:-
The invention relates to apparatuses utilizing the power of wind and air currents
for ventilating purposes. It consists mainly, of specially formed vertical extracting
tubes, or their equivalents formed into groups in various ways and each having a
long narrow vertical outlet opening. These openings have, at their edges,
projecting lips, which may be formed by curving the edges outward; or, by means
of vertical plates projecting outward from, & at a suitable angle to, the surface of
the tube, formed & situated so as to utilize the power of wind or air currents
passing across same. The vertical plates forming these projecting lips, or their
equivalents, may also project into the tube; so that, any rain &c., attempting to
enter the vertical openings of tube at an angle, from a side direction is caught by
the plate against which it impinges.
The horizontal bottom plate, or its equivalent, to which these tubes are attached,
& from which they spring, may project somewhat into the inside of tube between
the two vertical lip plates, and may finish at the back end of latter, and be
provided with a rim or turned-up edge, or its equivalent, of any desired height at
the back, so that rain canght by the vertical lip plates runs down same on to the
horizontal bottom plate beneath, and escapes at the outside of ventilator. The
height or length of the extracting tubes, or of the outlet openings varies with the
height of ventilator. The total sectional area is preferably equal to, or greater
than, that of the main upcast shaft of ventilator, or of the exit opening from the
apartment or building to be ventilated, and the total area of the outlet openings,
in these tubes, is also preferably equal to that of the main upcast shaft. The
shape of the tubes, in cross section or plan, may vary according to the form which
it is desired that the ventilator shall have externally or otherwise, and the tubes
forming one group or ventilator are not all necessarily of the same shape.
The air currents, are guided across these lipped openings of the extracting tubes,
after being gradually compressed by passing through a space or passage which has
been gradually constricted, & which is preferably formed by placing each tube-
with its lipped outlet opening opposite to the flat or curved surface of baffle or
guiding plates or of the external surface of other extracting tubes, the formation of
the extracting tubes, or of the guiding plates, causing the passage thus left to be
gradually constricted towards, & narrowest at, the point opposite to the lips of the
extracting openings, and widening out again gradually in a similar manner, or
otherwise, on the other side of the extracting openings.
These baffle or guiding plates, or their equivalents, used in conjunction with,
and situated opposite to, the openings of these vertical extracting tubes, are, in
some of the arrangements, formed by the surface of a square or other shaped
vertical tube, not having any extracting openings of its own, & hereinafter referred
to as the "baffle tube." In one of these latter mentioned arrangements the
vertical extracting tubes are grouped around a central vertical "baffle tube," the
shape of which, in cross section or plan, may be square.
Four vertical extracting tubes, or their equivalents, being used, one is placed
opposite each of the four sides of the square and each lipped opening of the tube
facing one of the sides of the square. The width of each extracting tube is about
the same as that of the side of baffle tube, which it faces.
It may be very slightly wider, but it should not be narrower, in this arrangement.

page_text: The back or outer part of each extracting tube, or its equivalent may be so
shaped, that, when thus grouped they form externally say a circle or other
suitable figure. To effect this, the inner portion of extracting tube, having the
vertical opening, which faces the "baffle tube," preferably joins the outer portion
or back of tube at the circumference of the circle formed by the group, making, in
this case, each tube, in section, somewhat of an irregular ellipse in shape, but with
sharp ends which then form vertical edges on each side of each tube.
This group does not however form a complete or unbroken circle, or other
figure, four vertical openings, of equal distance from each other, being left between
the tubes. Each opening, being directly opposite one of the four corners of
"baffle tube" inside, & bounded on either side by the thin vertical edge of an
extracting tube, also forms the mouth or wide end of two of the gradually
constricted passages.
When the wind or air current strikes this ventilator from a direction which
enables it to enter two of those external vertical openings, it passes directly into
and through the two gradually constricted passages which are practically in a line
with its course & after crossing the vertical lips of same passes out freely at the
two openings on the leeward side. When the wind strikes this ventilator from a
direction only faced by one of the four external vertical openings, it is upon
entering, met in the centre by the vertical corner of the square "baffle tube,"
which faces the opening & this corner divides the current, diverting a part to the
right hand & a part to the left hand gradually constricted passage, through which
it passes, escaping from thence at the two external openings at the end of these
passages.
The extracting tubes rest upon a horizontal, or convex bottom plate. They
communicate directly or indirectly with a hollow space or collecting chamber
situated either at the bottom or top of ventilator & formed by a continuation or
enlargement of the vitiated air flue or exit passage from the apartment or
building.
One end, of these extracting tubes, is closed, & the other opens into this
collecting chamber. When, therefore, the wind creates a vacuum in the tubes, in
the manner previously described, a supply of air is drawn by them directly or
indirectly from the collecting chamber, which is in turn supplied by the current of
vitiated air from the apartment or building. When the collecting chamber is at.
top of ventilator, the interior of the central "baffle tube" forms a continuation of
foul air flue from apartment or building & discharges into the collecting chamber.
In this arrangement the means of rendering the tubes weather-proof, before, and
hereinafter described is omitted.
"
When the collecting chamber is situated at the bottom of ventilator however,
the "baffle tube" is used merely to provide a surface opposite each of the outlet
openings of the extracting tubes placed around it, & in this case the top & bottom
of it may be closed. But, the baffle tube may in some instances be further
utilized in various ways, such as by using the space inside as part of a downcast
tube for fresh air, to be collected by a suitable arrangement of collecting chambers
situated at the top of ventilator. In this arrangement the "baffle tube' passes
through the horizontal top plate, or its equivalent, through the extracting
ventilator and also through the horizontal bottom plate & is continued down to the
apartment or space to which fresh air is to be conducted.
"
Or, when required, the interior of the "baffle tube" may be utilized by
arranging the extracting tubes to form a ventilator in connection with a smoke
chimney or stove pipe &c. utilizing whatever heat may be available by radiation
from latter for the purpose of assisting the upward current, of vitiated air, caused
by the extracting tubes. To effect this an outer concentric passage or flue, for
the passage of the vitiated air from the apartment or building, is formed around
the smoke pipe or chimney &c. by enclosing same in a suitable manner.
The lower end, of the outer or foul air flue, communicates with the apartment
to be ventilated (not necessarily the one to which the smoke flue is connected) and

page_text: the upper end closed in, and made tight around the smoke flue in a suitable manner
at a point situated outside the apartment or building, but not necessarily at the
extreme summit of smoke flue. The extracting tubes are then arranged on the top
of this foul air flue in a similar manner to that already described, the central
smoke flue or pipe in this case passing through the "baffle tube."
The extracting tubes draw from the foul air passage which they communicate
with & surmount.
The group of tubes may be held together & protected, from rain &c., at the top
by a sloping cap which is made tight around the smoke flue. The smoke flue or
other independent pipe may be continued any required height above the ventilator
or may terminate at the summit of same.
The outlet openings of extracting tubes used in any of the arrangements,
requiring it, are protected from the entrance of any rain &c. that may accidentally
find its way into the gradually constricted passages, by means of the plates forming
the lips projecting into the tube, or by a separate plate or plates, but for special
purposes they may be additionally protected from the weather by means of a series
of flat or curved plates, with their top end inclined inwards, preferably placed one
above another & stretching across the narrow outlet opening of tube & between the
projecting lips of same. The bottom, of the front edge of each of these plates is
situated at the front of the opening near the external edges or front of extracting
lips; and, each plate inclines inwards at a suitable angle, so that the top edge
projects slightly or otherwise into the tube. These inclined plates are fixed one
above another with the bottom or front edge of each on a slightly lower level than
the top or back edge of the plate below, a suitable space being thus left between
each. Rain &c. attempting to enter the exit opening of tubes is prevented &
caught by the inclined surface of these plates or louvres, & run off on to the
horizontal bottom plate of ventilator, to which the extracting tubes are attached.
Any water or rain &c. on this latter mentioned plate is prevented from entering
at the bottom of the outlet opening of extracting tube by the extension of the
bottom plate previously described; or, when the inclined plates or louvres are
used the front edge of the lowest one is attached & made tight to the horizontal
bottom plate.
The tubes with their lipped exit openings, or equivalents.and the guiding plates
or "baffle tube," or equivalents, may be made of any suitable material & arranged
in any suitable manner either together or separately to utilize the aspirating power
of wind or air currents & to form a ventilating appliance.
The means of rendering same weatherproof may be varied or altered to meet the
special requirements of the case.
Utober 1801
FREDERIC WILLIAM BARKER.
COMPLETE SPECIFICATION.
Improvements in Ventilators.
FREDERIC WILLIAM BARKER, 7 Ferndale Road, Liverpool, Heating and
Ventilating 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 :-
The invention relates to apparatuses utilizing the power of wind and air currents
and also the heat of smoke pipes, flues, chimneys, etc., for ventilating purposes. It
consists mainly of specially formed vertical extracting tubes arranged or grouped
in various ways and each tube having a single long narrow vertical outlet opening.
This opening in each tube has at its edges, projecting lips formed and situated so
as to utilize the power of wind or air currents passing across same externally, to
create a partial vacuum within the tube. The lips are formed by curving the

page_text: .
edges outward or by means of vertical plates projecting outwards from, and at a
suitable angle to the external surface of the tube. The height or length of each
vertical extracting tube, and, or, of the outlet opening in same varies according to
the desired height and proportions of the ventilator.
The total sectional area of the vertical extracting tubes comprised in a
ventilator, is preferably equal to, or greater than, that of the main upcast shaft of
the ventilating flue or of the exit opening from the apartment or building etc. to
be ventilated; and the total area of the outlet openings in the total number or
group of tubes comprised in a ventilator is also preferably equal to that of the
main upeast shaft tube or flue. The shape of the vertical extracting tubes in
cross section or plan may vary according to the form or shape which it is
desired that the ventilator shall have externally or otherwise, and the tubes
forming one arrangement or group or ventilator are not all necessarily of the same
shape.
The wind or air currents are guided across the lipped openings of the vertical
extracting tubes after being gradually compressed by passing through a space or
passage which has been gradually constricted and which is preferably formed by
placing each tube with its lipped outlet opening opposite to the flat or curved
surface of a central or other vertical tube (hereinafter termed the "baffle tube")
and which tube has no extracting opening of its own in its side or sides, it merely
serving the purpose so far as its external surface is concerned, of baffle plates to
the vertical extracting tubes. The uses of the interior of this "baffle tube" are
described hereinafter. By another arrangement, the "baffle tube" is dispensed
with, and the extracting tubes are formed and reciprocally arranged so that part
of the external surface of one vertical extracting tube serves as the "baffle tube'
or guiding plate to the outlet opening of the next adjacent tube to gradually
compress the air currents as before described. In every case the passage between
the extracting opening and the "baffle tube is preferably gradually constricted
towards the point opposite to the lips of the extracting opening and widening out
again gradually in a similar manner, or otherwise, on the other side.
I will now describe in greater detail some of the various applications of different
forms of these tubes, and in order that the description may be readily understood,
reference is to be had to the annexed drawings, illustrative thereof, in which the
same reference letters are used to indicate like parts whenever same are
repeated
Fig. 1. is a vertical section through a ventilator having four vertical extracting
tubes A, arranged around a central "baffle tube" B, and arranged to extract
directly from the chamber F below.
Fig. 2. is an elevation of same.
Fig. 3. is a horizontal section of same.
Fig. 4. is a part vertical section and a part elevation of an old fashioned weather-
proof outlet ventilator of a well known ordinary pattern.
Fig. 5. is a horizontal section through same.
Fig. 6. is a part vertical section and a part elevation of same but showing the
addition of the vertical extracting tubes A of modified form.
Fig. 7. is a horizontal section through same.
:
Fig. 8. is a part vertical section and a part elevation of another form of old
fashioned weatherproof outlet ventilator of a well known ordinary pattern.
Fig. 9. is a horizontal section through same.
Fig. 10. is a part vertical section and part elevation of same, but showing the
addition of the vertical extracting tubes A of modified form.
Fig. 11. is a horizontal section of same.
Fig. 12. is a vertical section of a ventilator with the vertical extracting
tubes A of modified form, arranged on the same principle as in Figs. 6 and 7, 10
and 11.
Fig. 13. is a horizontal section of same.
Fi 14 is an elevation of
CAMA

page_text: vertical extracting tubes A, reciprocally arranged, so that part of each one serves
the purpose of a baffle or guiding surface in front of the extracting opening of the
next adjacent tube-no special or central "baffle tube" B, or separate baffle plates
being used.
Fig. 16. is a horizontal section through same.
Fig. 17. is an elevation of same.
Fig. 18. is a vertical section through a modified form of ventilator in which the
central "baffle tube" B around which the vertical extracting tubes A, of modified
form are arranged, is part of a smoke pipe, flue or chimney.
Fig. 19. is a horizontal section through same, two of the tubes A. being shewn
with louvres e between the lips a.
Fig. 20. is an elevation of same.
Fig. 21. is a vertical section through a modified form of ventilator in which the
central "baffle tube" B, around which the vertical extracting tubes A, of modified
form are arranged, is utilized for the passage of a descending current of fresh air
collected by means of collecting chambers at the top.
Fig. 22. is a horizontal section through tubes of same.
Fig. 23. is an elevation of same.
Fig. 24. is a horizontal section through collecting chambers of same.
Fig. 25. is a horizontal section showing a modified plan and arrangement of the
extracting tubes A, and the baffle tube B, and suitable for use in place of some of
the horizontal sections presented in the previous figures.
Fig. 26. is a horizontal section showing a modified form of the extracting
tubes A, and the plate E, suitable for a ventilator of octagonal form externally.
Fig. 27. is a horizontal section of a modified form of the tubes A, reciprocally
arranged, the central tube or shaft not being used as a baffle tube.
In the ventilator_shown by Figs. 1, 2, and 3, four vertical extracting tubes A,.
are grouped around a central vertical "baffle tube" B, the shape of which in
horizontal section is square. One vertical extracting tube being placed opposite
each side of the square and with its lipped opening C, facing same. The width of
the tubes A is about the same as that of the side of "baffle tube" B, which it
faces. They may be slightly wider, but should not be narrower in its arrangement.
The back or outer part of each tube A, may be so shaped that when they are thus
grouped, they form externally a circle as shown, or other suitable figure such as is
illustrated by Figs. 13 and 26.
Four vertical openings D of equal distance from each other are left between
the tubes A, each opening being directly opposite one of the four corners of
"haffle tube," B.
When the wind or air current strikes this ventilator from a direction which
enables it to enter two of the openings D, it passes directly into and through the
two gradually constricted passages which are practically in a line with its course,
and after_crossing the vertical lips, a, of same, passes out freely at the two
openings D, on the leeward side, and in passing across the lips, a, it creates a
partial vacuum within the tubes, A.
When the wind strikes this ventilator from a direction only faced by one of the
four openings D, it is, upon entering same, met in the centre by the vertical corner
of the "baffle tube" B, facing the opening, this corner divides the current and
diverts part of it into the right hand, and part into the left hand, gradually-
constricted passage, through which it passes and escapes thence at the two
openings D, at the end of these passages, after having exerted its aspirating effect
upon the air in the tubes A, as it passes, in the same manner as above described.
The lips, a, are formed in this arrangement by curving outwards the edges of the
vertical outlet opening of the tube, as shown in Fig. 3.`
The tubes, A, rest upon a horizontal or convex plate E which surmounts a
hollow space or collecting chamber F, situated at the bottom of ventilator, and
formed by the continuation or enlargement of the vitiated air fine, or exit

page_text: -
"
:
.
: passage J, from the apartment or building, etc. The bottom ends of the tubes A,
are open, and they communicate by means of perforations in the plate E, with the
collecting chamber F. When, therefore, the wind or air current creates a partial
vacuum in the tubes A in the manner previously described, a supply of air is
drawn by them direct from the collecting chamber F, which is in turn supplied by
the current of vitiated or other air from the apartment or building, etc. Any
rain, etc., collecting on the plate E. is in this arrangement prevented from entering
the outlet openings C of the tube, by means of the vertical ledge b, formed at the
bottom of each.
In this arrangement the "baffle tube," B, is used only to provide a surface
opposite each of the outlet openings C of the tubes A, placed around it; but this
"baffle tube" B, is in some instances further utilized in various ways which will
be hereinafter described with reference to other figures of the annexed drawings.
The ventilator may be surmounted by a conical cap H, or covering of any other
design.
Figs. 4 and 5. show an old fashioned form of ventilator in very wide use, baving
descending or syphonic outlets for the vitiated air which it discharges in the form
of descending currents from the chamber G through the outlets I.
Figs. 6 and 7 show the application of the vertical extracting tube A, to this
ventilator, their upper or open ends being connected to the outlets I, so as to form
a continuation of same,-their lower ends being closed, and these lipped openings C
facing the central tube J, which now also forms the "baffle tube" "B. The
addition of these tubes A, greatly increases the efficiency of the ventilator for
extracting, without interfering with the total outlet area.
"
Fige. 8 and 9 show another old fashioned form of ventilator having a descending
or syphonic outlet,-the vitiated air being discharged into the top chamber
formed by the conical cap H, and escaping thence by descending below the lower
edge of latter, a style of ventilator which is well known and widely used.
Figs. 10 and 11. illustrate the application of the vertical extracting tube A, to
this style of ventilator. These tubes are closed at the bottom, their tops opening
into the chamber G, to which they are connected by the plate E¹. The lipped
openings C face the centre shaft J, which thus also forms the baffle tube B.
Figs. 12, 13 and 14, illustrate a modified form of the ventilator shown by
Figs. 6 and 7, 10 and 11, the modification being principally in the shape of the
tubes A and B, as shown more especially by Fig. 13. The base of the ventilator
is shown as for fitting over a wood or other bed, the vitiated air flue J, passing
down through same.
"
Figs. 15, 16 and 17 show the tubes A, in a simple form and reciprocally arranged
in a very simple manner so that no central "baffle tube" B, or any other separate
baffle plates of any kind are required. The extracting openings C are situated
so as to face the nearest external surface of the next adjacent tube A, this portion
of the latter thus serving as a "baffle tube or guiding surface for the wind or air
currents. Thus each tube A, has its extracting opening C, protected by part of
the circumference or surface of one of the next adjacent tubes, and in turn part of
its own surface or circumference performs the same office for the other of the next
adjacent tubes, this arrangement being exceeding simple and effective. Any
The tubes A. are
suitable number of tubes may be employed from three upwards.
closed at the top and draw from the chamber F at the bottom, any rain etc.
collecting on the plate E is prevented from entering the outlet openings C, by the
vertical ledge b formed at the bottom of each. There is shown by dotted lines in
Fig. 15, an alternative plan of protection which may be adopted instead or as
well-it consists of forming the bottom plate E, concave instead of flat or convex,
any rain collecting on this plate E being drained off immediately by the tube C,
which passes out of the side of the chamber F.
Figs. 18, 19 and 20, show a duplex form of ventilator wherein the tubes A are
arranged around a smoke pipe, flue or chimney, J¹, the vitiated air flue J
terminating in the chamber F being also formed around same, so as to utilize its

page_text: heat for increasing the speed of the up-current of vitiated air. The tubes A. are
open at the bottom and communicate with the chamber F. In Figs. 18 and 19,
there are shown two different ways in which the outlet openings C of the tubes A
may be protected from driving rain etc. One arrangement shows vertical lip
plates A, fixed between the outlet openings C, and projecting outwards, so as to
form the lips of same, these plates also projecting inwards and thus catching any
rain that may drive in sideways.
At the bottom of these plates at the back, is situated a sloping or vertical
ledge b. By the other arrangement shown, there is added to the arrangement just
described, a number of sloping plates or louvres e.
Figs. 21, 22, 23 and 24, illustrate another duplex form of ventilator wherein the
central "baffle tube" B is utilized as a supply shaft J' for a descending current of
fresh air, the tubes A being arranged around same, as shown by Fig. 22. The
vertical plates or ledges 6 are, in this ventilator carried up the tubes A as shown
in Figs. 21 and 22, only that portion of the bottom of tube A which lies behind
these plates 6 being open to the chamber F, so that vitiated air drawn from the
latter, rises up the back or outer half of each tube A, over the top of plate b, and>
thence out of the outlet opening C. The downcast current of fresh air J' may be
obtained by the wind or air current-collecting-chambers K which are continued so
as to direct the collected air downwards in the usual way with downcasts. Within
the tube B is fixed a concave descending spiral L, through the centre of which
passes a water collecting pipe M, which is perforated with a large number of holes
down the greater part of its length; before it reaches the lowest portion of the
spiral the perforations cease, and the pipe is taken out. through the side of the
tube B, as shown. The spiral offers little obstruction to the descending air, but
any rain or spray etc., which might find its way into the concave spiral, runs of
same through the perforations into the collecting pipe M, whence it escapes to the
outside of ventilator, by running off the plate E.
Figs. 25 and 26, show horizontal sections of modified forms and arrangements of
the extracting tubes A and the "baffle tube" B. The arrangement shown by.
Fig. 25 is a very simple effective and powerful one; and the arrangement shown
by Fig. 26 is suitable where the ventilator is desired to be of octagonal form
externally either of these arrangements so far as the horizontal sectional shape of
the tubes is concerned could be used instead of, and is interchangeable with any
of those shown by Figs. 3, 13 and 19, respectively, but their adoption would, of
course, modify the appearance of the vertical sections and elevations that are
shown in connection with the last mentioned figures.
This
Fig. 27. shows a horizontal section of a modified form of the extracting_tubes A
reciprocally arranged so as to be independent of the central tube J.
arrangement could be used instead of, and is interchangeable with that shown by
Fig. 11.
The means herein before described of rendering weatherproof the outlet
openings C of the tubes A may be varied or altered to meet the special require-
ments of the case and may be interchanged.
The vertical extracting tubes A with their lipped exit openings C may be made
of any suitable material and formed or arranged in any suitable manner either
reciprocally or in conjunction with the "baffle tube" B, to form a ventilating
appliance for utilizing the aspirating power of wind or air currents and to utilize
the heat of smoke pipes, flues, chimneys etc., for assisting the up current of vitiated
air. These ventilating appliances in their varied modified forms, are intended for
use for all kinds of buildings and apartments etc., and all purposes (such as
ventilating soil pipes, etc.) that wind current ventilators may be used for. I do not
confine myself to the exact length, height and proportions or construction of the
various parts or provisions as illustrated by the annexed drawings, which drawings
do not show to the fullest extent the application of the improvements.
I reserve the right of altering the formation of these and adopting any new
inodification having a like object, to suit particular requirements or otherwise,

page_text: always, however, retaining the essential features respectively characterized in the
claiming clause hereinafter appended. It is obvious that variations can be made
whilst still embodying the essential features.
In all the arrangements of the vertical extracting tubes A, separate ordinary
baffle plates or single plates of metal, etc., as generally used opposite the outlets in
wind current ventilators, are entirely avoided; and I wish it to be understood that
I do not adopt or claim any arrangement whereby these are required, nor do I
adopt or claim the formation of vertical slits or openings into a single central tube
or chamber, such as forms practically a continuation of the main upcast shaft or
flue (and which in some patterns, is divided into four or more parts by internal
vertical divisions) nor the single separate protecting or guiding plates generally
placed in front of such openings, and situated concentrically, or otherwise, in
relation to the central tube or chamber. The uses of the central "baffle tube " B
are entirely confined to the purposes shown in the illustrations annexed or referred
to in the description.
I do not form this "baffle tube" B with any kind of vertical side outlet
openings.
I do not claim as novel the employment of lipped outlet openings in ventilators
utilizing wind and air currents as motive power, nor do I claim the use of groups
of tubes having more than one extracting opening or whose openings are protected
by separate plates or shields, but
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
(1) For use in wind current ventilators the construction and employment of the
vertical extracting tubes A, each tube having a single vertical outlet opening C,"
with external lips or projections, a, the tubes and these lips being formed or
arranged to utilize the aspirating power of wind or other air currents which are
guided across the lipped outlet openings C by means of part of the external
surface of an adjacent and similar extracting tube or by means of a central vertical
"baffle tube" B, or its equivalent, no separate, single or independent vertical
baffle plate or plates being used for this purpose, the whole substantially as
herein before described, and with reference to the annexed drawings illustrative
thereof.
(2) In combination and conjunction with the vertical extracting tubes A; the
formation, arrangement and employment of a central vertical "baffle tube " B, so
that its external surface or surfaces are used for the purposes of gradually
compressing and guiding wind or other air currents across the lipped openings C
of the vertical extracting tubes A; and also in some cases the formation of the
"baffle tube" B, so that the interior of same may be employed or utilized for
any of the several purposes herein before described in reference to the interior of
this tube B. The whole substantially as herein before described and with reference
to those of the annexed drawings which are illustrative thereof.
Dated this 4th day of June 1892.
FREDERIC WILLIAM BARKER.