Improvements in Chimneys and Chimney Tops or Caps.
Year: 1886

page_text: Date of Application, 9th Oct., 1886
Complete Left, 6th July, 1887.
Complete Accepted, 9th Aug., 1887.
PROVISIONAL SPECIFICATION.
Improvements in Chimneys and Chimney Tops or Caps.
I HARRY SMITH OBBARD of Loudoun Cheltenham in the County of Gloucester a
Major General in Her Majesty's Forces do hereby declare the nature of this invention
to be as follows:-
The improvements consist in the combination with a chimney or pot having a more
or less contracted mouth or orifice, of a fluted outer beading or cap sloping inwards
and upwards towards the orifice; the object being to cause the smoke to issue with
more force by contracting the mouth, and the wind to carry the smoke upwards by
means of the fluted beading made at such an angle as will clear the orifice and so
allow the free issue of smoke, and thereby the wind be prevented from blowing down
the chimney. In some cases a fluted cap can be constructed to put on existing
chimney pots and such cap can be made with a constricted throat.
HERBERT & Co.,
67, Strand, W.C.,
Agents.

page_text: Improvements in Chimneys and Chimney Tops or Caps.
I, HARRY SMITH OBBARD, a Major General in Her Majesty's Forces, of Loudoun,
Cheltenham, in the County of Gloucester, do hereby declare the nature of my
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 chimney tops for use with smoke stacks or chimneys,
ventilating shafts and the like and its purpose to render the same more efficient in
causing the issue of the smoke and preventing down drafts of wind from entering the
chimney.
The improvements consist first in narrowing the top of the chimney so as to cause
the smoke to be discharged therefrom with greater force or velocity, secondly in
providing the same with an outer surrounding collar formed essentially as a fluted
truncated cone or pyramid.
Referring to the accompanying drawing.
Fig. 1 is an elevation of the improved chimney top formed of metal, Fig. 2 is a
central vertical cross section thereof Fig. 3 is an elevation of the improved chimney
top formed in clay stoneware or the like-Fig. 4 being a central vertical cross
section thereof.
B is the body of said chimney top, the same being narrowed at C as shown in
Figs. 2 and 4. Upon the same is fixed the fluted collar A of convenient depth the
fluted grooves extending to the summit of the chimney top.
If composed of metal, the collar may be formed of a truncated cone or pyramid
having rivetted to it vertically outstanding ribs of 1 or metal strengthened if
necessary by the disc E and wire ring or band D, the latter being however so placed
as not to close the upper ends of the grooves formed by or between said ribs.
The same result may also be attained by use of corrugated metal.
The following relative dimensions have been found useful with the chimney tops
designed for dwelling houses-Metal tops-32 grooves inch wide at upper rim,
18 in. at lower rim, uniform depth one inch-Clay or stoneware; grooves inch wide
and deep at upper rim-1 inch wide and deep at lower rim, number of grooves
also 32 These dimensions and number of grooves may however be varied. It will
be understood that the bodies B may be cylindrical, square, hexagonal, or of other
prismatic form.
The collars A may also be formed with three,-four,-five or more sides besides the
conical form. The body B may be adapted also to fit into, around or upon existing
chimney tops.
The improved fluted collar causes currents of air to be deflected from the line of
the prevailing wind, along the grooves, thus causing said currents to arrive against
the smoke, heated air or the like issuing from the chimney in the direction of such
grooves, and so assist the escape of said smoke etc from the chimney.

page_text: The collar A may be used upon chimney top body without reduction or narrowing
of the orifice of the latter.
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 is :-
1. A chimney top composed of a body B in combination with a fluted or ribbed
truncated conical or pyramidical collar A at the upper end thereof.
2. A chimney top composed of a body B having a narrowed orifice C in combination
with the collar A.
3. A collar consisting of a hollow truncated cone or pyramid, the outer surface of
the same being fluted or upwardly channelled said collar being adapted to be
attached to a chimney top with its upper rim coincident with the upper rim of said
top, or extended above the same.
Dated this 6th day of July 1887.
HARRY SMITH OBBARD.
By Herbert & Co.,
67, Strand, London, W.C.,
Agents to Applicant.