Improvements in and connected with Pots, Cowls, or Tops, applicable for Chimneys or Ventilating Shafts.
Year: 1894

page_text: Date of Applicati n, 14th Dec., 1894
Complete Specification Left, 5th Apr.. 1895-Accepted, 11th May 1895
PROVISIONAL SPECIFICATION.
Improvements in and connected with Pots, Cowls, or Tops,
applicable for Chimneys or Ventilating Shafts.
We, FREDERICK THOMAS MYERSON, of No. 211 St. John's Street, Clerkenwell,
Iron-plate Worker and THOMAS LANE, of No. 54 Gee Street, Goswell Road,
Tin-plate Worker, both in the County of London, do hereby declare the nature
of this invention to be as follows:-
The object of our invention is to improve the construction of pots, cowls, or
tops for chimneys or ventilating shafts as hereafter described, whereby down
draft, so common to ordinary chimneys is prevented and the updraft greatly
increased, while the details of construction are such that the parts are not liable to
become inoperative.
According to our invention, we provide a central vertical tube, slightly tapering
towards its upper end, such tube being or forming the direct continuation of the
chimney or ventilating shaft. Surrounding this tube we provide an outer casing,
forming an air chamber; the outer walls of this air chamber extend slightly above
the top of the tapering tube, and the said walls are formed at the lower extremity
with air apertures, so that the radiating heat of the tapering inner tube causes an
updraft in the air chamber, and in like manner, wind or air currents, impinging
against the outer casing will further cause or increase updraft in the said air
chamber. This air chamber casing, we make in the form of a pair of double
cones, each cone arranged base to base, and the two pairs of cones fitted together,
so as to somewhat resemble an hour-glass, in configuration. It in the lowest
inverted cone that the air apertures are formed, and the lower edge of this latter
cone is joined to the tapering tube. The central portion between the pairs of
double cones, that is, the central constricted neck, is of such diameter that a space
exists between the central tapering tube and the outer walls of the air chamber
at this part. Upon the upwardly inclined exterior surface of the lower double
cone, we provide a suitable number, (say four) of open mouthed conical tubes each
communicating with the air chamber formed in the interior of the lower double
cone.
The upper extremity of the walls of the air chamber extends as aforesaid
slightly above the central tube and a space exists between the said tube and the
contracted orifice of the air chamber, thus, when in use, air passing through the
lower openings and passages acts with an injector like effect and produces an
increased and steady updraft in the central tube.
We preferably provide at a suitable distance above the air chamber and central
vertical tube, a conical cap, to act as a protection against any chance direct
downward air current or rain.
Dated this 14th day of December A D 1894.
F. T. MYERSON.
THOMAS LANE.

page_text: Improvements in and connected with Pots, Cowls, or Tops,
applicable for Chimneys or Ventilating Shafts.
We FREDERICK THOMAS MYERSON of 211 St. John's Street, Clerkenwell,.
Iron Plate Worker, and THOMAS LANE of 54 Gee Street, Goswell Road, Tin
Plate Worker, both in the County of London, 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 object of our invention is to improve the construction of pots, cowls, or tops
for chimneys or ventilating shafts as hereafter described, whereby downdraft, so
common to ordinary chimneys may be effectually prevented and the updraft greatly
increased, while the details of construction are such that the parts shall not be
liable to become inoperative.
Our invention will be readily understood by the following description having.
reference to the accompanying drawings, whereon is shewn at Figure 1 in elevation,
an example of a pot, cowl, or top, constructed according to our said invention,
Figure 2 being a vertical section taken about centrally of Figure 1 and Figure 3.
a horizontal section on the line Z-Z of Figure 1.
Similar letters of reference indicate corresponding parts in the several figures of
the drawing.
According to our invention, we provide a central vertical tube A, preferably
slightly tapering towards its upper end, as at A¹, such tube A being or forming
the direct continuation of the chimney or ventilating shaft.
Surrounding the upper part of this tube A, we provide an outer casing forming.
an air chamber B, having a contracted intermediate diameter; the outer walls or
casing of this air chamber extend slightly above the top of the tube A A', and
the said walls are formed at the lower extremity with air apertures B¹; so that the
radiating heat of the inner tube A A' causes au updraft in the air chamber, and
in like manner, wind or air currents impinging against will further cause an
increased updraft in the said air chamber.
We
This air chamber casing we make in the form of a pair. of double cones C:C',
each single cone arranged hase to base, and the two pairs of cones C. C! fitted
together so as to somewhat resemble an hour-glass in configuration;, in some cases
we may form the air chamber casing, of two communicating globular vessels.or the.
chamber casing may be square in horizontal section with inclined sides, and
especially so, should the tube A A' itself be square in horizontal section.
form the aforesaid air apertures B in the lower inverted cone C; and the lower
edge of this cone is joined to the central tube. A. The central portion intermediate
_ of the double cones C Cis-contracted in diameter, forming a neck of such diameter
as to leave a space; between the central tube and the outer walls of the air chamber.
Upon the upward inclined exterior surface of the lower cone. C, we provide a
suitable number of open mouthed, conical tubes D, each covering, an opening, D
into the interior of the double cone C at that part.
Q
The upper extremity of the walls of the air chamber C¹, extend as aforesaid.
slightly above the central tube A, so as to leave a space between the top of the
said tube A and the contracted orifice of the air chamber (C¹).
It will now be understood that air passing through the several openings and
-passages B, D, B acts with an injector-like effect and produces an increased and
steady updraft in the central tube, whilst the openings B also serve for the escape
of any accumulation of soot, that may fall into the air chamber B.
We preferably provide at a suitable distance above the air chamber and central
tube, a conical cap E, to act as a protection against a chance or direct, downward
air current or rain.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim as our improvements in, and connected with pots, cowls, or tops, applicable
for chimneys or ventilating shafts is as follows:-
1. Constructing the cowls or tops of chimney or ventilating shafts, with conical
central tubes having their terminations surrounded by air chambers open at top,
having contracted intermediate diameters, and formed with openings in the lower
part or parts of the outer walls, as and for the purpose set forth.
.
2. The air chamber surrounding the upper termination of the central tube, in
the form of two pairs of double cones, attached at bottom to the central tube or
shaft, the top of the upper cone supporting a cap and the lower cones provided
with openings and covered ways, as herein shown and described.
3. The general arrangement and combination of parts, composing our improved
pot, cowl, or top, for chimneys or ventilating shafts, all constructed, and acting,
substantially as described, and with reference to the accompanying drawings,
together with any mere modification or modifications thereof.
Dated thie 4th day of Anril 1895
F. T. MYERSON.
T. LANE.