IMPROVEMENTS IN STEAM ENGINES
Year: 1870

page_text: LETTERS PATENT to Eustace Wigzell and Joseph Pollit, of the Firm
of Timothy Bates and Company, of Sowerby Bridge, near Halifax.
in the County of York, Engineers and Millwrights, for the
PROVISIONAL SPECIFICATION left by the said Eustace Wigzell and
Joseph Pollit at the Office of the Commissioners of Patents, with
their Petition, on the 27th April 1870.
We, EUSTACE WIGZELL and JOSEPH POLLIT, of the Firm of Timothy
Bates and Company, of Sowerby Bridge, near Halifax, in the County of
York, Engineers and Millwrights, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN STEAM ENGINES," (to be as follows) :-
This Invention relates to a means or method of combining and i
arranging the cylinders of compound steam engines, so as to economise
space and render them better adapted for marine engines, yet equally
applicable for land purposes.

page_text: The improvements consist in either casting the high-pressure cylinder
upon the cover of the low pressure, or casting the two cylinders together
concentrically in line with each other; and in having two piston rods
to the low-pressure piston projecting on opposite sides (outside) of
the high-pressure cylinder, and connected to the same cross head to
which the piston rod of the said high cylinder is connected, and
thereby worked simultaneously. Also in having a piston rod to the
low-pressure piston passing through the back or opposite end of the
cylinders for working the air pumps.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Eustace Wigzell and Joseph Pollit in the Great
Seal Patent Office on the 27th October 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, EUSTACE
WIGZELL and JOSEPH POLLIT, of the Firm of Timothy Bates and
Company, of Sowerby Bridge, near Halifax, in the County of York,
Engineers and Millwrights, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-seventh day of April, in the year
of our Lord One thousand eight hundred and seventy, in the thirty-third
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto us, the said Eustace Wigzell and Joseph Pollit, Her special
licence that we, the said Eustace Wigzell and Joseph Pollit, our exe-
cutors, administrators, and assigns, or such others as we, the said Eustace
Wigzell and Joseph Pollit, our 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 Ircland, the Channel Islands, and Isle
of Man, an Invention for "IMPROVEMENTS IN STEAM ENGINES," upon, the
condition (amongst others) that we, the said Eustace Wigzell and Joseph
Pollit, our executors or administrators, by an instrument in writing under
our, 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

page_text: Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.
NOW KNOW YE, that we, the said Eustace Wigzell and Joseph Pollit,
do hereby declare the nature of our said Invention, and in what manner
the same is to be performed, to be particularly described and ascertained.
in and by the following statement and one accompanying Sheet of
Drawings (that is to say) :-
This Invention relates to a means or 'method of combining and
arranging the cylinders of compound steam engines so as to economize
space and render such better adapted for marine engines, yet equally
applicable for land purposes.
The improvements consist in either casting the high-pressure cylinder
upon the cover of the low pressure, or casting the two cylinders together
concentrically in line with each other, and in having two piston rods to
the low-pressure piston projecting on opposite sides (outside) of the
high-pressure cylinder and connected to the same cross head to which
the piston rod of the said high-pressure cylinder is connected, and
thereby worked simultaneously.
In order that the Invention may be more readily understood we
have herein given reference to an accompanying Sheet of Drawings
illustrating the same.
Fig. 1 is a longitudinal view of the combined cylinders and pistons,
shewn partly in section to admit of a better explanation thereof being
given, and Fig. 2 is the end view of same.
A is the low-pressure cylinder; B, the piston; and C and O' are the
two piston rods passing through stuffing boxes D and D' in the cover E,
and are connected to a cross head F, each end of which is formed to
work or slide in guide frames in the usual manner; G is the high-
pressure cylinder, which is cast on the cover E of the low-pressure
cylinder, having a cover with stuffing box H fitted thereto in the usual
manner; I is the piston; and J, the piston rod, which passes through
the stuffing box, and is fixed to the cross head F.
It will now be seen that both pistons being connected to the same
cross head must necessarily be worked simultaneously, the valves and
ports for steam and exhaust being suitably arranged and operated for

page_text: the purpose, as will be easily and well understood by all practical
engineers.
It will be observed that these Drawings are more particularly made
to shew the application of the Invention for marine purposes, but it
will also be evident that it is equally applicable for land purposes, and 5
either to be placed in the vertical or horizontal position.
Having thus described the nature of our said Invention, and shewn
by Drawings the manner in which the same is to be performed or
practically applied, we would have it understood that we do not claim
the combining of high and low pressure cylinders, or for working the 1
pistons thereof simultaneously, but what we do claim is, the combination
and arrangement of such in manner substantially as shewn by the
Drawings and described herein.
In witness whereof, I, the said Eustace Wigzell, for and on behalf
of myself and the said Joseph Pollit, have hereunto set my hand 1
and seal, this Twenty-fifth day of October, in the year of our
Lord One thousand eight hundred and seventy.
Signed, sealed, and delivered by
the within-named Eustace Wigzell,
in the presence of
WM. TASKER,
Patent Agent,
Halifax & Bradford.
E. WIGZELL.
(L.S.)