AN IMPROVEMENT IN COWLS."
Year: 1876

page_text: LETTERS PATENT to John Deakin, of Southwark, in the County of Surrey,
for the Invention of "AN IMPROVEMENT IN COWLS."
led the 1st December 1876, and dated the 16th June 1876.
PROVISIONAL SPECIFICATION left by the said John Deakin at the Office of
the Commissioners of Patents on the 16th June 1876.
JOHN DEAKIN, of Southwark, in the County of Surrey.
COWLS."
"AN IMPROVEMENT IN
My Invention, which relates to cowls for chimney and ventilating shafts, has for
its object a cowl of simple and cheap construction, so hung that no obstruction is
presented to the cleaning of the cowl by the ordinary sweep's broom, as is the
case when the cowl is hung on a central pivot in the ordinary manner.
My Invention consists in a cowl of cylindrical form hung as on gimbals, so as to
be free to be inclined in any direction by the pressure of the wind. The cowl is
so balanced as to hang vertically when not influenced by the wind, so as to afford
a free exit for the smoke. It is of cylindrical form, as above mentioned, with
slightly flared end, and is of larger diameter than the chimney top which it
surrounds, at a sufficient distance to permit of the cowl being inclined so as to
present its lower mouth to the wind and produce an upwardly directed current
through the cowl which greatly improves the draught. The cowl is hung on two
pivots diametrically opposite one another on a ring which is intermediate of the
cowl and chimney top, and is itself hung upon the chimney top by two other pivots
at right angles to the first.
JOHN DEAKIN, of Southwark, in the County of Surrey.
"AN IMPROVEMENT IN

page_text: is presented to the cleaning of the cowl by the ordinary sweep's broom as when
the cowl is hung on a central pivot in the ordinary manner.
My Invention consists in a cowl in the form of a cylinder, with the lower end
slightly flared or enlarged, or of other analogous form open at both ends, and hung
on gimbals so as to be inclined freely in any direction by the pressure of the wind.
The cowl is so balanced that when not influenced by the wind it will hang
vertically and afford a free exit for the smoke. The cowl is of larger diameter
than the chimney top, which it surrounds at such a distance as to allow it to be
inclined sufficiently to present its lower mouth to the wind, and so produce an
upwardly directed current through the cowl which greatly improves the draught.
The cowl is hung on two pivots diametrically opposite one another on a ring which
is intermediate of the cowl and chimney top, and is itself hung upon the chimney
top by two other pivots at right angles to the first.
Figure 1 represents an elevation, Figure 2 a central vertical section, and Figure 3
a horizontal section on line 1-1, Figure 2, of my improved cowl mounted on a
chimney top.
The cowl consists of a tube a open at both ends and of rather larger diameter
than the chimney top 6, the lower end of the cowl being slightly enlarged or
trumpet shaped, as shown, to allow the cowl to be inclined (as shown in dotted
lines) by the pressure of the wind against it. The cowl a is hung upon two gudgeons
or horizontal pivots c, c, upon a horizontal ring & midway between the cowl a and
the chimney top b, and which is itself hung upon the chimney top by two other
gudgeons or pivots e, e, at right angles to the pivots c, the whole forming a support
similar to the well-known form of gimbals, so that the cowl may be free to incline
in any direction. The pivots c, c, e, e, are represented as being formed on the
ring d and supported in sockets in the cowl a and chimney top 6 respectively, but
the arrangement may be reversed. The enlargement of the lower end of the
cowl a affords room for the ring d, which must be of larger diameter than the
chimney top so as not to come in contact therewith until the cowl is sufficiently
inclined.
b
Having described the nature of my said Invention, and the manner of performing
the same, I declare that what I claim as the Invention to be protected by the
herein-before in part recited Letters Patent is, a tubular cowl hung on gimbals and
surrounding the chimney top, substantially as shown and described.
In witness whereof, I, the said John Deakin, have hereunto set my hand and
seal, this Fifteenth day of December, in the year of our Lord One thousand
eight hundred and seventy-six.
JOHN DEAKIN. (LS.)