AN IMPROVED APPARATUS FOR THE CURE OR PREVENTION OF SMOKY CHIMNEYS, AND ALSO FOR THE VENTILATION OF SHIPS, ROOMS, AND BUILDINGS IN GENERAL
Year: 1850

page_text: PASCAL'S SPECIFICATION.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JEAN
LOUIS PASCAL, of 22, Moorgate Street, in the City of London, send greeting.
WHEREAS Her niost Excellent Majesty Queen Victoria, by Her Letters
Patent under the Great Seal of the United Kingdom of Great Britain and Ire-
land, bearing date at Westminster, the Twenty-fourth day of October, in the year
of our Lord One thousand eight hundred and fifty, in the fourteenth year of Her
reign, did give and grant unto me, the said Jean Louis Pascal, my exors, adiñors,
and assigns, Her especial license, full power, sole privilege and authority, that I,
the said Jean Louis Pascal, my exors, admors, and assigns, and such others as
I, the said Jean Louis Pascal, my exors, adñiors, and assigns, should at any
time agree with, and no others, from time to time and at all times thereafter
during the term of years therein mentioned, should and lawfully might make,
use, exercise, and vend, within that part of the United Kingdom of Great
Britain and Ireland called England, Her Dominion of Wales, and the Town
of Berwick upon Tweed, and in the Islands of Jersey, Guernsey, Alderney,
Sark, and Man, and in all Her Colonies and Plantations abroad, my Inven-
tion of "AN IMPROVED APPARATUS FOR THE CURE OR PREVENTION OF SMOKY
CHIMNEYS, AND ALSO FOR THE VENTILATION OF SHIPS, ROOMS, AND BUILDINGS IN
GENERAL;" in which said Letters Patent there is contained a proviso that if
I,. the said Jean Louis Pascal, shall not..particularly describe and ascer-
tain 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

page_text: the same to be enrolled in Her said Majesty's High Court of Chancery within
six calendar months next and immediately after the date of the said in part
recited Letters Patent, that then the said Letters Patent, and all liberties
and advantages whatsoever thereby granted, should utterly cease, determine,
and become void, any thing therein-before contained to the contrary thereof in
any wise notwithstanding, as, reference being thereunto had, will more fully
and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Jean Louis Pascal, do hereby declare the nature of my said Invention, and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement, and the Figures and Drawings
therein referred to.
The apparatus shewn in the accompanying Drawings has been devised and
arranged for the purpose of preventing the smoking of chimnies, and of ventila-
tion, by producing an upward draft of air in the chimney or shaft communi-
cating with the apartment to be ventilated. This apparatus consists of an
outer tube or case placed over or around the tube, within which the smoke
ascends, or by which the room is to be ventilated. Between this inner and
outer tube, at the lower part of the latter, are placed certain inclined and curved
plates or pieces of metal connecting the two tubes together, and arranged so
that the wind or current of external air striking upon them will be reflected,
and cause an upward current between the two tubes. Above the inner tube
is placed a fan capable of revolving about an axis, and with three or four plates
or vanes arranged in such manner as that the ascending current of rarified or
heated air, or the current pushed between the external and internal tubes,, or
the two currents combined, may cause the fan to rotate about its axis, and act
as an exhauster, and thus improve the draft of a chimney above which it may
be placed, or ventilate any apartment or place into which the inner tube may
lead. The whole may be surmounted by a cowl or hord of the ordinary con-
struction, and poised so as to turn about and protect the upper part of the outer
tube in the usual manner, according to the direction of the wind.
The annexed Drawing shews the general arrangement and proportion of the
parts, which may be varied according to the size of the chimney, or the pecu-
liarity of the situation in which the apparatus is employed.
Having now described the nature of the said Invention, and in what manner
the same is to be performed, I wish it to be understood that I am aware of a
screw or screws having been placed within chimney tubes at or near the tops
thereof, but such have not answered in practice. I do not therefore claim
the use of screws so placed; but I hereby claim as the. Invention intended to

page_text: be protected by the said Letters Patent, an apparatus in which a fan, with
three or four curved plates or vanes, portions of a screw, is caused to rotate
about an axis by the ascending current, or by a current between the internal
and external tube or the two currents combined, so as to act as an exhauster,
as above described, and represented in the accompanying Drawings.
In witness whereof, I, the said Jean Louis Pascal, have hereunto set
my hand and seal, this Third day of February, in the year of our
Lord One thousand eight hundred and fifty-one.
AND BE IT REMEMBERED, that on the Sixth day of February, in
the year of our Lord 1851, the aforesaid Jean Louis Pascal came before
our said Lady the Queen in Her Chancery, and acknowledged the Specification
aforesaid, and all and every thing therein contained and specified, in form above
written. And also the Specification aforesaid was stamped according to the tenor
of the Statute made for that purpose.
Enrolled the Sixth day of February, in the year of our Lord One
thousand eight hundred and fifty-one.