IMPROVEMENTS IN CHIMNEY TOPS AND FLUES
Year: 1885

page_text: I WILLIAM HOLT of N° 83 Snargate Street, Dover, in the County of Kent,
Optician, do hereby declare the nature of my invention for IMPROVEMENTS IN
CHIMNEY TOPS AND FLUES to be as follows :-
My invention relates to improvements in chimney tops and flues, whereby
I propose to prevent down draughts and encourage up draughts in chimneys and
flues of all kinds.
It consists in the application at top of a chimney pot, chimney, or flue, of a
horizontal cover or plate, having a central opening of say half the diameter of the
pot or flue, or more than one opening if found more desirable, the great feature of
my invention being that my horizontal cover, cap, or plate does not gradually but
at once reduce the diameter of the exit from the pot or flue, leaving the smoke to
rise in full volume until it meets this plate where it is broken to pass through the
one central or several smaller apertures.
I propose to make my horizontal plate or cap of metal, or of any suitable
material and to secure it on the chimney pot or flue by luting, by a copper or other
metal wire, or in any suitable manner but always as far as possible so that no air
can enter between the cap or plate and the sides of the pot or flue.
I may also make my horizontal plate or cap of one piece with the chimney pot,
whether of metal or pottery ware, and I prefer that it should form a cap or cover
at the actual top of the pot or flue.
By the use of my horizontal top plate or cover with central opening of less
diameter than the pot or flue I obtain the advantage that there is no restricted
space or recess in which soot can collect to stop the draught, that the warm smoke
rising freely to the plate heats the whole of the top and accelerates the upward
draught, that soot cannot collect to choke the aperture or apertures of my
horizontal plate, and that nothing is presented to deflect the wind to constitute a
downward draught.

page_text: Improvements in Chimney Tops and Flues.
"
I WILLIAM HOLT of N° 83 Snargate Street Dover in the County of Kent,
Optician do hereby declare the nature of my invention for IMPROVEMENTS IN
CHIMNEY TOPS AND FLUES" and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement:-
My Invention relates, to improvements in chimney tops and flues whereby
I propose to prevent down draughts and encourage up draughts in chinneys and
flues of all kinds.
It consists in the application at top of a chimney pot, chimney, or flue, of
à horizontal cover or plate, having a central opening of say half the diameter
of the pot or flue, or more than one opening if found more desirable, the great
feature of my invention being that my horizontal cover, cap, or plate does not
gradually but at once reduce the diameter of the exit from the pot or flue, leaving
the smoke to rise in full volume until it meets this plate where it is broken to
pass through the one central or several smaller apertures. I propose to make my
horizontal plate or cap of metal, or of any suitable material and to secure it on the
chimney pot or flue by luting, by a copper or other metal wire, or in any suitable
manner but always as far as possible so that no air can enter between the cap or
plate and the sides of the pot or flue.
I may also make my horizontal plate or cap of one piece with the chimney pot,
whether of metal or pottery ware, and I prefer that it should form a cap or cover
at the actual top of the pot or flue.
On the accompanying sheet of Drawing.
Figure 1-Represents an elevation of a chimney top fitted with my cover plate.
2-Being a section through the same.
"
"
"
"
3-Is an elevation of a chimney top embodying my Invention and fitted
with a wind guard.
4-Illustrates the application of my Improvements to a Steam-boat
funnel.
5-Represents the same as applied to a flue.
A Being the Chimney top.
B Is the horizontal plate.
C Opening in same.
D Flange in rim for securing plate on chimney top.
E Wind guard.
F Studs or supports for same.
By the use of my horizontal top plate or cover with central opening of less
diameter than the pot or flue I obtain the advantage that there is no restricted
space or recess in which soot can collect to stop the draught, that the warm smoke
rising freely to the plate beats the whole of the top and accelerates the upward
draught, that soot cannot collect to choke the aperture or apertures of my horizontal 4
plate, and that nothing is presented to deflect the wind to constitute a downward
draught.

page_text: 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
The application to chimney tops and flues of a horizontal top plate or cover
having a central opening or openings of less diameter than the pot or flue
substantially as described for the purposes specified.