IMPROVEMENT ON SMOKE JACKS
Year: 1795

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
PROSSER, of Back Hill, in the Parish of Saint Andrew, Holborn, in the County
of Middlesex, Whitesmith, send greeting.
WHEREAS His present most Excellent Majesty King George the Third,
by His Letters Patent under the Great Seal of Great Britain, bearing date at
. Westminster, the Eighth day of September, in the thirty-fifth year of His
.reign, did give and grant unto me, the said John Prosser, my executors,
administrators, and assigns, His especial licence, full power, sole privilege and
authority, that I, the said John Prosser, my executors, administrators, and
assigns, by myself and themselves, or by my or their deputy or deputics,
servants or agents, or such others as I, the said John Prosser, my executors,
.administrators, or 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
expressed, should and lawfully might make, use, exercise, and vend my
"IMPROVEMENT ON SMOKE JACKS," within that part of His Majesty's Kingdom
of Great Britain called England, His Dominion of Wales, and Town of
Berwick-upon-Tweed, in such manner as to me, the said John Prosser, my
executors, administrators, and assigns, or any of us, should in our discretion
seem meet; in which said Letters Patent is contained a proviso that if I, the
said John Prosser, should not particularly describe and ascertain the nature of
niy 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

page_text: .
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in His Majesty's High Court of Chancery within one calendar month 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, should
utterly cease, determine, and become void, anything therein-before contained to
the contrary thereof in anywise notwithstanding, as in and by the said Letters
Patent, relation being thereunto had, may more fully and at large appear.
NOW KNOW YE, that I, the said John Prosser, in pursuance of and
compliance with the said proviso, do hereby declare the nature of this Invention
is an Improvement on Smoke Jacks, by which they will go a long time with
once oyling, which may be done by any person without going up the chimney,
as herein-after particularly described :-
Fig. 1 represents an improved jack. A is the body or case which is fixed
inside the chimney, which body contains the worm wheels, steps oyl, &c. B is
the bottom bar, to which the body A. is fixed by screws, or screws and nuts;
on the other end is fixed the box C, containing two friction wheels or rollers;
instead thereof may be used a standard or loop, in which the pivot of the
hollow spindle or barrell D runs. E is tho stroko or chain wheel which
comes outside the chimney. On either side of this wheel may be the screw or
stopper F, to be taken out when the jack wants oyl, and the oyl poured into
the holes. On the reverse side of the barrell or spindle D is another holo
within the body A, through which the oyl runs. G is the upper part of the
worm, on which is the fly H. I is the top or lid, rising in the middle to
clear the main wheel; or, if the main wheel should not rise above the
body, it may be flat. This top or lid must have a notch or hole for the worm
to run. through. It may be fixed to the body by screws, or scrows and
nuts, or any other eligible way. K is a screw and nut coming through
the bottom bar, by which the jack is fixed to the bearing bar in the chimney.
Fig 2 represents the frame with the worm wheels, &c. which the body A con-
'tains. G is the worm on the top of which is placed the fly H, which, being driven
round by the draft or air, causes the worm wheel L to move round; on the axis
of this wheel is the wheel or pinion M, which communicates the motion to the
main or upper wheel N, to which the chain wheel and spindle D and E are
fixed, as represented in Fig. 1. 0, 0, 0, is the frame, which must fit on all
sides with great exactness in the body A; in this frame runs the pivots of the
wheels L, M, N. P is the step of steel on which the steel point of the worm
.runs. Qis a loop in which tho lower part of the worm runs. R is the
upper-loop or carriage in which the worm likewise runs. These loops may be
fixed in the frame by screws and nuts.

page_text: This machine or jack may be made of cast or wrought iron, or of any other
metal or composition of metals most eligible, or part of one substance and part
of another. The shape of the body may be either square, round, or any other
equally or more convenient; the size of the whole proportioned to the chimney,,
flue, funnel, or place in which it is intended to be fixed. The improved part
or jack may be fixed to a double or single outside movement with horizontal
wheels. The hollow spindle or barrel D, with the stopper and hole F, may be
placed as represented in Fig. 3, where S is the hole to pour the oyl in at, and
instead of a chain wheel a bevel wheel is fixed, which wheel communicates the
notion to the wheels on either or both sides, as occasion may require.
In witness whereof, the said John Prosser hath hereunto set his hand and
seal, this Sixth day of October, in the year of our Lord One thousand
seven hundred and ninety-five.
(L.M.)
ER.
Sealed and delivered (being first duly
stamped) in the presence of
THO. BAINBRIDGE.
THO. LLOYD.
AND BE IT REMEMBERED, that on the Sixth day of October, in the
thirty-fifth year of the reign of His Majesty King George the Third, the said
John Prosser came before our said Lord the King in His Chancery, and
acknowledged the Instrument aforesaid, and all and every thing therein contained
and specified, in form above written. And also the Instrument aforesaid
was stamped according to the tenor of the several Statutes made in the sixth
year of the reign of the late King and Queen William and Mary of England,
and so forth, and in the seventeenth and twenty-third years of the reign of Ilis
present Majesty King George the Third.