IMPROVEMENTS IN PUMPS
Year: 1839

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
HENRY LE MESURIER, of the Parish of Saint Peter Port, in the Island of
Guernsey, Master Plumber, send greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Seventeenth day of June, in the second year of Her reign, did.
for Herself, Her heirs and successors, give and grant unto me, the said
Thomas Henry Le Mesurier, Her especial licence, full power, sole privilege
and authority, that I, the said Thomas Henry Le Mesurier, my exors, adiñors,
and assigns, or such others as I, the said Thomas Henry Le Mesurier, my
exors, admors, 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 the Islands
of Jersey, Guernsey, Alderney, Sark, and Man, and also in all Her said
Majesty's Colonies and Plantations abroad, my Invention of "IMPROVEMENTS
IN PUMPS;" in which said Letters Patent is contained a proviso, that I, the said
Thomas Henry Le Mesurier, shall cause a particular description of the nature
of my said Invention, and in what manner the same is to be performed, to be
inrolled in Her said Majesty's High Court of Chancery within six calendar
months next and immediatdly after the date of the said in part recited Letters
Patent, as in and by the same, reference being thereunto had, will more fully
and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Thomas Henry Le Mesurier, do hereby declare that the nature of my said
Invention, and the manner in which the same is to be performed, are particu-

page_text: larly described and ascertained in and by the following statement thereof,
reference being had to the Drawing hereunto annexed, and to the figures and
letters marked thereon (that is to say):-
DESCRIPTION OF THE DRAWING.
Figure 1 is a section of a pump constructed according to my Invention;
Figure 2 is a section of the valve chamber and passages connected therewith;
and Figure 3 is a plan of the lower part of the chamber in which the flexible
piston works. In each of these Figures the same letters indicate similar
parts. a is a chamber, which is divided into two parts by the flexible piston;
b', b, the rod, which works the piston, being in a perpendicular position; c is a
valve which admits the water or other fluid from the suction pipe to the
under side of the piston when the piston is raised into the upper part of
the chamber a; d is a valve which admits water or other fluid: to the upper
side of the piston when a vacuum is formed in the upper part of the chamber a.
The descent of the piston forces the water through the opening e in the-side
of the chamber a, and thence through the valve f into the valve chamber g;
on raising the piston the water is forced from the upper part of the chamber a
through the valve h into the same division of the valve chamber into which
the valve opens, and from thence may be permitted to flow through the
cock i, or may be forced to a higher elevation through the pipe j, as circum-
stances may require..
'
A
The flexible piston is secured to the piston rod between two dished metal
plates k, k, by a nut and pin, as is well understood, and the outer edge of
the piston is held between the upper and lower parts of the chamber a. The
piston may be moved up and down by a lever or any other convenient mode,
all which will readily be applied by a competent workman.
Figure 4 shews a modification of the pump above described, which, as the
parts are clearly shewn in the Drawing, and are marked with the same letters
of reference, it will not be necessary to enter into a further description.
Figure 5 shews a plan of the lower part of the pump (shewn at Figure 4),
which contains the induction openings.
Figure 6 shews a plan of the chamber a, shewn at Figure 4, except
that the valve chamber g is placed at right angles to the position shewn at
Figure 4, which I sometimes find more convenient.
In witness whereof, I, the said Thomas Henry Le Mesurier, have here-
unto set my hand and seal, this Ninth day of December, in the year
of our Lord One thousand eight hundred and thirty-nine.
T. H. LE MESURIER. (L.S.)

page_text: AND BE IT REMEMBERED, that on the Ninth day of December, in the
year of our Lord 1839, the aforesaid Thomas Henry Le Mesurier 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.
Inrolled the Seventeenth day of December, in the year of our Lord One
thousand eight hundred and thirty-nine.