AN IMPROVED MACHINE OR TOP FOR THE CURE OF SMOAKY CHIMNIES
Year: 1819

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOSEPH
HILL, of the Parish of Paulton, in the County of Somerset, Gentleman,
send greeting.
WHEREAS His most Excellent Majesty King George the Third did, by
His Letters Patent under the Great Seal of the United Kingdom of Great
Britain and Ireland, bearing at Westminster, the Twenty-third day of January,
in the fifty-ninth year of His reign, give and grant unto me, the said Joseph
Hill, my exors, adñiors, and assigns, His especial licence, full power, sole
privilege and authority, that I, the said Joseph Hill, my exors, adiñors, and
assigns, during the term of years therein mentioned, should and lawfully might
make, use, exercise, and vend, within England, Wales, and the Town of Berwick
upon Tweed, my Invention of "AN IMPROVED MACHINE OR TOP FOR THE CURE
OF SMOAKY CHIMNIES;" in which said Letters Patent there is contained a proviso
that if the said Joseph Hill shall not particularly describe and ascertain the
nature of my said Invention, and in what manner the same is to be performed,
by an instrument in writing under my hand and seal, and cause the same to.
be inrolled in His Majesty's High Court of Chancery within two calendar
months next and immediately after the date of the said Letters Patent, that
then the said Letters Patent, and all liberties and advantages whatsoever thereby
granted, shall utterly cease, determine, and become void, as in and by the same,
relation being thereunto had, will more fully and at large appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
Joseph Hill, do hereby declare that the nature of my said Invention, and the
manner in which the same is to be performed, are particularly described and
ascertained in the following description and annexed Drawing thereof (that
is to say) :-
My machine for the cure of smokey chimneys consists of, first, a self-acting
valve, represented at Fig. 1; in this Fig. the valve is shewn suspended by two
chains (and ballanced) in a frame, which may be placed within the chimney
some way down from the top, and when a Sudden gust of wind attempts to
pass down the chimney this valve will close, and again' immediately rise when
the pressure of the wind is gone; but if it should be considered that some
aperture is necessary to carry off the smoke, in the event of the valve being
kept down by the pressure of the wind, I have provided for this by Fig. 2,
which shews a chimney top having the above self-acting valve, and four other
valves below at the sides to suffer the smoke to escape when the top valve
might be pressed down by the wind:
Fig. 3 represents a section and internal view of Fig. 2, shewing its construc-
tion; but I do not mean to confine myself to a square top, but apply the same
contrivance to round or any other convenient shaped tops, and, of any length
which may be found under circumstances desirable. Another contrivance,
represented by Fig. 4, is a box with the top closed, having sundry openings
for the escape of smoke on the sides, and valves to shut off the wind;-.in each
of these valves is a small hole (say, about an inch diameter). Fig. 5 shews
the internal construction of Fig. 4, in which are cross pipes opposite to the
holes of the valves, and when the wind strikes upon one side of the said box,
the valves on that side are closed; but the wind passing through the hole and
along the pipes to the opposite side will, by the flanched form of the ends, spread
itself and force open the opposite valves, and suffer the smoke to escape;. .in
this contrivance I do not confine myself to any particular diameter, or to the
square form of box, as represented, neither to any particular number of pipes
or valves; and if it should under circumstances be found that these apertures
are not perfectly sufficient to carry off all the smoke, I should place a pipe or
tube on the top of the box with a self-acting valve, as described, Fig. 1.
Experience has proved that notwithstanding every guard to stop the wind,
it will sometimes force its way down the sides of chimneys, and. drive the
smoke at the lower part into the room; to prevent this inconvenience, I have
contrived a hood, covering the throat of the chimney, shewn at Fig. 6, with a
small pipe or tube on its top; this, pipe is attached to the hood by two turn
buckles or otherwise, and fitted at the bottom to an aperture in the hood for
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