CERTAIN INSTRUMENT, ENGINE, OR MACHINE TO BE WROUGHT BY MEANS OF AIR AND WATER, OR BY AIR, FIRE, AND WATER, BY WHICH ANY OF THE SAME WORKS MAY BE PERFORMED AS CAN BE DONE BY MILLS, ENGINES, OR BY ANY OTHER OF. THE KNOWN MECHANICAL POWERS
Year: 1792

page_text: PARKER'S SPECIFICATION..
TO ALL TO WHOM THESE PRESENTS SHALL COME, THOMAS
PARKER, of Drake Street, Red Lion Square, in the County of Middlesex,
Esquire, sendeth greeting.
WHEREAS His present Majesty King George the Third, by His Letters
Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Twenty-second day of December now last past, hath given
and granted unto the said Thomas Parker, by the name and addition of
Thomas Parker, of Drake Street, Red Lyon Square, in the County of Middle-
sex, Esquire, his executors, administrators, and assigns, special licence; full
power, sole privilege and authority, to make and vend a "CERTAIN INSTRUMENT,
ENGINE, OR MACHINE TO BE WROUGHT BY MEANS OF AIR AND WATER, OR BY AIR,
FIRE, AND WATER, BY WHICH ANY OF THE SAME WORKS MAY BE PERFORMED AS CAN
BE DONE BY MILLS, ENGINES, OR BY ANY OTHER OF. THE KNOWN MECHANICAL POWERS,"
within that part of Great Britain called England, His Majesty's Dominion of
Wales, and Town of Berwick-upon-Tweed, and also in all His Majesty's
Colonies and Plantations abroad, for the term of fourteen years from the date
of the said Letters Patent, and to have and enjoy the full benefit and sole
use and exercise of the said Invention during the term aforesaid, subject never-
theless to a proviso or condition in the said Letters Patent contained, that
if the said Thomas Parker should not particularly describe and ascertain
the nature of his said Invention, and in what manner the same is to be per-
formed, by an instrument in writing under his hand and seal, and cause the
same to be inrolled in the High Court of Chancery within six calendar
months next ensuing the date of the said Letters Patent, then the said

page_text: Letters Patent, and all liberties and advantages whatsoever thereby granted
should utterly cease, determine, and be void.
NOW KNOW YE, that the said Thomas Parker, in compliance with and
performance of the condition of the said Letters Patent, doth by this instru-
ment in writing under his hand and seal, particularly describe and ascertain
the nature of his said Invention, and the manner in which the same is to be
performed, as well by the figures or delineations of machinery contained in
the schedule accounts annexed, as by the description or explanation thereof
herein-after also set forth, that, is to say:-...
Figure 1. A, an air pump or pumps or bellows, to produce a coninued
stream of air. B, a pipe conducting air from the pump to a wheel in water.
C, a fire or stove, through or over which the pipe passes to convey heated air
into the water for the purpose of heating the water, that the air may be
expanded and produce a greater effect than cold air, or by heating the air in
this or any other manner in its course to the water, and also by heating the
water by a fire immediately under the water vessel or cistern. D, a wheel
fixed in a cistern of water, a 'sufficient depth to fill the buckets into which the
air enters from the pipe or pipes, and by its ascending force when in the buckets
producing a rotatory motion.
Figure 2. A, an air vessel in a cistern of water, and receiving air in the
same manner as the buckets of the wheel. B, the conducting pipe; E, a
valve; F, a stud for opening the valve as the air vessel ascends, the air
escaping by the opening of the valve, and the air vessel being made of a suffi-
cient weight to sink to the bottom of the cistern to be again filled with air,
to ascend, by which the air vessel acts in the manner of the piston of the steam
engine. G, a beam similar to the beam of a steam engine put in motion by
the ascent and descent of the air vessel. The pump or pumps or bellows,
when once set in motion either by hand or any other moving power, may have
the motion continued by a crank wheel or leaver, receiving its motion either
from the wheel or air vessel, or from the beam; and upon the same principle
any number of wheels or air vessels may be wrought in water for any of the
purposes to which mechanical powers can be applied. In working the air
pumps by a steam engine, the water cistern containing one or more air wheels
or vessels may be so placed as to heat the water by the same fire as heats the
boiler of the steam engine for the purpose of increasing the force of this engine
by the expansion of the air when conveyed into the water cistern; or the same
effect may be produced by laying the air pipes through the boiler of the steam
engine, or
or through water to be heated in the cistern or in a vessel placed
between the air pumps and the water cistern; and the force of the engine

page_text: may be further increased, or 'an air pump wrought by covering the water
cistern, leaving only a single opening through which the air ascending in the
water may escape as through a chimney, in which a wheel may be placed to
eceive its motion by the current of air when the engine is wrought with cold
ir, or by air and steam when the water is heated.
In witness whereof, the said Thomas Parker hath hereunto set his
hand and seal, the Eighteenth day of June, in the thirty-third year of
the reign of our Sovereign Lord George the Third, by the Grace of
God of Great Britain, France, and Ireland, King, Defender of the
Faith, &c., and in the year of our Lord One thousand seven hundred
and ninety-throo