AN IMPROVED SHIP'S MAIN PUMP, APPLICABLE TO OTHER PURPOSES LSO
Year: 1856

page_text: LETTERS PATENT to John Murdocb, Plumber and Brassfounder, residing
in Dundee, in the County of Forfar, in Scotland, for the Invention of
"AN IMPROVED SHIP'S MAIN PUMP, APPLICABLE TO OTHER PURPOSES LSO."
Sealed the 9th June 1857, and dated the 19th December 1856.
PROVISIONAL SPECIFICATION left by tho, said John Murdoch at the
Office of the Commissioners of Patents, with his Petition, on the
19th December 1856.
I, JOHN MURDOCH, Plumber and Brassfounder, residing in Dundee, in
the County of Forfar, in Scotland, do hereby declare tho nature of the said
Invention for "AN IMPROVED SHIP'S MAIN PUMP, APPLICABLE TO OTHER PURPOSES
ALSO," to be as follows; and consists particularly in the simplicity of arrange-
ment, whereby the principle part of the pump, viz., the barrels and chambers,
aro cast in one piece; and instead of having one barrel working with ono
suction pipo and one discharge pipe, and one receiving chamber and one
discharging chamber, I have two or more barrels working with one suction
pipe and one discharge pipe, and one receiving chamber and one discharging
chamber, and that cither as force pump and lift pump, or lift pump only.
In working any pump of a single barrel in the back stroke the water is at
a stand still in the suction pipe, & also in a great measure in the discharge
pipe; by substituting two or more barrels I obtain a continuous flow through
the suction and discharge pipe, instead of alternate or intermittent; thus, a

page_text: pipe that is used for a single chamber of a given size will give double the
advantage in a pump of two chambers. The plan 1 have found to answer
well in practice is to place two or more barrels in the upper chamber to draw
from the lower chamber, and by the mutual or reciprocal action of the two
barrels obtain a continuous flow through one discharge and one suction
pipe.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Murdoch in the Great Seal Patent Office on, the
19th June 1857.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
MURDOCH, Plumber and Brassfounder, residing in Dundee, in the County of
Forfar, in Scotland, send greeting:
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Nineteenth day of December, in the year of our Lord
One thousand eight hundred and fifty-six, in the twentieth year of Iler reign;
did, for Herself, Her heirs and successors, give and grant unto me, the said
John Murdoch, Her special licence that I, the said John Murdoch, my
executors, administrators, and assigns, or such others as I, the said John
Murdoch, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times thereafter during
the term therein expressed, should and lawfully might make, use, exercise,
and vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "AN IMPROVED SHIP'S
MAIN PUMP, APPLICABLE TO OTHER PURPOSES ALSO," upon the condition (amongst
others) that I, the said John Murdoch, my executors or administrators, by an
instrument in writing under my, or their, or one of their hands and seals, should
particularly describe and ascertain the nature of the said. Invention, and in
what manner the same was to be performed, and cause the same to be filed
in the Great Seal Patent Office within six calendar months next and imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said John Murdoch, do hereby declare the
nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
This Invention consists particularly in the simplicity of arrangement,
whereby the principle part of the pump, viz., the barrels and chambers, are

page_text: cast in one piece; and instead of baving one barrel working with one suction
pipe and one discharge pipe, and one receiving chamber and one discharging
chamber, I have two or more barrels working with one suction pipe and one
discharge pipe, and ono receiving chamber and one discharging chamber, and
that either as force pump and lift, or lift pump only.
In working any pump of a single barrel in the back stroke the water is at a
stand still in the suction pipe, & also in a great measure in the discharge
pipe; by substituting two or more barrels I obtain a continuous flow through
the suction and discharge pipes, instead of alternato or intermittent; thus, a
pipe that is used for a single chamber of a given sizo will give double the
advantage in a pump of two chambers.
In the annexed Drawings, which represent some of the modifications of my
Invention, Fig. 1 is a front view.
Fig. 2 is a plan, showing arrangement of barrels.
Figs. 3 & 4 are longitudinal sections.
Figs. 5 and 7 are transverse sections.
Fig. 6 is the form when used as a force pump for land purposes. The
reason I prefer this form is for the convenience of getting at the under valve B,
without removing the plunger C. A is a cover to get at the under valve.
Fig. 8 is a transverse section of another form of pump constructed on the
principles herein described. D is the under valve, which rises to allow the
water to enter when A (a solid plunger) rises; when A is at its full height.
and begins to descend then the valve D shuts, and the upper valve C opens to
let out the water.
Having now described the nature of my said Invention, and the manner in
which it may be put into practical operation, what I claim as new and of my
Invention is, the construction and arrangement of machinery for pumping, as
herein set forth.
In witness whereof, I, the said John Murdoch, have hereunto set my
hand and seal, this Sixteenth day of June, in the year of our Lord
(AD 1857) One thousand eight hundred and fifty-sovon
JOHN MURDOCH. (L.S.)