A METHOD OF SIMPLIFYING AND IMPROVING THE CON- STRUCTION OF EXTINGUISHING ENGINES AND FORCING PUMPS
Year: 1816

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
DODGSON, of the Parish of Saint Paul Shadwell, in the County of Middlesex,
Pump and Engine Manufacturer, send greeting.
WHEREAS His present Majesty King George the Third, in and by His
Letters Patent, under the Great Seal of Great Britain, bearing date at West-
minster, the Twenty-seventh day of May last, for Himself, His heirs and
successors, did give and grant unto me, the said George Dodgson, His special
licence, full power, sole privilege and authority, that I, the said George Dodgson,
my executors, administrators, and assigns, and every of them, by myself and
themselves, or by my and their deputy or deputies, servants, or agents, or such
others as I, the said George Dodgson, 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, within England, Wales, and the Town
of Berwick-upon-Tweed, and in all His said Majesty's Colonies and Plantations
abroad, my Invention of "A METHOD OF SIMPLIFYING AND IMPROVING THE CON-
STRUCTION OF EXTINGUISHING ENGINES AND FORCING PUMPS;" in which said Letters
Patent there is contained a proviso, obliging me, the said George Dodgson, by
an instrument in writing, under my hand and seal, particularly to describe and
ascertain the nature of my said Invention, and in what manner the same is to
performed, and to cause the same to be inrolled in His Majesty's High Court
of Chancery within two months next and immediately after the date of the
said recited Letters Patent.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
George Dodgson, do hereby describe and ascertain the nature of my said
Invention, and in what manner the same is to be performed, by the above plan
or print, and the following description thereof, that is to say:-
Mysaid Invention is applicable to pumps and all engines wherein valves are used.
The principal improvement consists in placing the valves in a better manner than
has hitherto been done, as, by comprising two valves in a single box that can be
taken out without unfixing or unscrewing any part of the machinery, it can either
be repaired, or, by a spare box, be replaced at pleasure with little or no loss of
time. A vertical section of this box is seen at No. 4, which, as is common in
other pump boxes, must have a cross bar at the top to lift it up by or lower it into
its place or chamber, and which I make in two parts, screwed or any other-
ways fastened together; the upper part containing the side valve, No. 5,
opening outwards, has two grooves to hold packing, to make it air-tight, the
lower grooves being of less diameter than the upper, in order to fit a similar
conical taper in the body of the pump or engine, of any convenient length and
taper. The lower part, No. 6, of the box contains the under valve valve No. 7
opening inwards, which can be unscrewed or separated from the upper part to
repair the leather of the valve. The chamber has a hollow protuberance or
swelling all round the outside of the box, as shewn at No. 2, to give space for
the opening of the side valve of the box, and which makes it indifferent how
the box happens to be lowered into its chamber; the space within this protu-
berance also communicates with the air vessell and discharging pipe and nozzle.
The air vessell, which is shewn No. 12, can be placed either between the two
chambers or pump heads, No. 3 and No. 10, or on one side, or may even
surround both pumps, care being taken to make it sufficiently strong, so that,
when great force is employed at the engine, the pressure of air upwards may
not damage the air vessell. This improvement may be applied to the present
fire engines, of any construction, with but little alteration of them, which renders
any particular description of a fire extinguishing engine unnecessary.
In witness whereof, I have hereunto set my hand and seal, the Ninth day
of July, in the year of our Lord One thousand eight hundred and

page_text: AND BE IT REMEMBERED, that on the same Ninth day of July, in the
year above mentioned, the aforesaid George Dodgson came before our Lord
the King in His Chancery, and acknowledged the Specification aforesaid, and
all and every thing therein contained, in form above written. And also the
Specification aforesaid was stamped according to the tenor of the Statute in
that case made and provided.
Inrolled the same Ninth day of July, in the year above written.