IMPROVEMENTS IN STEAM ENGINES
Year: 1871

page_text: LETTERS PATENT to William Inglis, of Bolton, in the County of.
Lancaster, and John Frederick Spencer, of Westminster, in the
County of Middlesex, Engineers, for the Invention of "IMPROVEMENTS
IN STEAM ENGINES."
Scaled the 7th September 1871, and dated the 11th March 1871.
PROVISIONAL SPECIFICATION left by the said William Inglis and
John Frederick Spencer at the Office of the Commissioners of
Patents, with their Petition, on the 11th March 1871.
We, WILLIAM INGLIS, of Bolton, in the County of Lancaster, and
JOHN FREDERICK SPENCER, of Westminster, in the County of Middle-
sex, Engineers, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN STEAM ENGINES," to be as follows:-
This Invention relates to improved arrangements or combinations of
the parts of steam engines designed for marine purposes, but also appli-
cable otherwise. Such improved arrangements and combinations being
more or less developements of improvements described in the Specifi-

page_text: cation of certain Letters Patent granted to William Inglis, one of the
present applicants, and dated 23rd Nov. 1868 (No. 3546), and also
of improvements described in the Specification of certain Letters Patent
granted to the present applicants and dated 19th April 1870 (No. 1131).
In the present arrangement or combination the engines are what
are commonly termed "compound" and comprise a small high-pressure
cylinder and a large low-pressure cylinder placed side by side. The
steam is transferred from the former to the latter by means of separate
intermediate transverse cylindrical valves, one pair or two pair being
used accordingly as it may be preferred to adopt the arrangement
without an intermediate receiver, or with an intermediate receiver,
whilst the steam may be exhausted from the large cylinder by the same
kind of cylindrical valves or otherwise, but the present Invention consists
in combining with such arrangements in either case one or two slab
gridiron or other well-known rectilineally sliding valves instead of
cylindrical valves to admit the steam into the high-pressure cylinder,
such valve or valves being by preference worked by the usual link
motion to admit of the cut-off being easily varied.
When this Invention is applied the cranks may be at right angles or
nearly so, or the two cylinders may be attached to one crank or other-
wise, and the valves may be worked in any approved way.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Inglis and John Frederick Spencer
in the Great Seal Patent Office on the Sth September 1871.
TO ALL TO WHOM THESE PRESENTS. SHALL COME, wc, WILLIAM
INGLIS, of Bolton, in the County of Lancaster, and JOHN FREDERICK
SPENCER, of Westminster, in the County of Middlesex, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eleventh day of March, in the year of
our Lord One thousand eight hundred and seventy-one, in the thirty-
fourth year of Her reign, did for Herself, Her heirs and successors, give
and grant unto us, the said William Inglis and John Frederick Spencer,
Her special licence that we, the said William Inglis and John Frederick

page_text: Spencer, our executors, administrators, and assigns, or such others as
we, the said William Inglis and John Frederick Spencer, 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 Ireland, the
Channel Islands and Isle of Man, an Invention for "IMPROVEMENTS IN
STEAM ENGINES," upon the condition (amongst others) that we, the said
William Inglis and John Frederick Spencer, our executors or adminis-
trators, by an instrument in writing under our, or one of our or their,
or one of their hands and seals, should particularly describe and ascertain
the nature of our 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.immediately after the date
of the said Letters Patent.
NOW KNOW YE, that we, the said William Inglis and John Frederick
Spencer, 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 in writing, and on
reference being had to the accompanying Sheet of Drawings, that is to
say:
Our said Invention relates to improved arrangements or combinations
of the parts of steam engines designed for marine purposes, but also
applicable otherwise, such improved arrangements and combinations
being more or less developments of improvements described in the
Specification of certain Letters Patent granted to William Inglis,
and dated 23rd November 1868 (No. 3456), and also of improvements
described in the Specification of certain Letters Patent granted to
us the said William Inglis and John Frederick Spencer, and dated
19th April 1870 (No. 1131).
And in order that our said Invention and the manner of performing
the same may be properly understood we hereunto append an explanatory
Drawing representing by way of example one modification of engines as
constructed with our present improvements.
In the improved arrangement or combination one modification of which
is shown in vertical longitudinal section in the Drawing, the engines
are what are commonly termed "compound," and comprise a small
high-pressure cylinder 1 and a large low-pressure cylinder 2 placed side

page_text: by side. The steam is transferred from the former 1 to the latter by
means of separate intermediate valves 3, 4, one pair being used as
shown in the Drawing, or two pairs, accordingly as it may be preferred,
to adopt the arrangement without an intermediate receiver or that with
an intermediate receiver, whilst the steam may be exhausted from
the large cylinder 2 by the same kind of cylindrical valves 5, 6, or
otherwise.
Our present Invention consists in combining with arrangements such
as have been herein-before referred to, one or two slab, gridiron, or other
well-known rectilineally sliding valves, instead of cylindrical valves to
admit the steam into the high-pressure cylinder 1, such valve or valves
being by preference worked by the usual link motion to admit of the
cut-off being easily varied.
In the example shown in the Drawing two-slab valves 7, 8, worked by
a rod or pair of parallel rods 9, are applied, the ports being near the ends
of the cylinder so as to communicate therewith by short passages.
When our Invention is applied as herein-before described, the cranks
10, 11, may be at right angles or nearly so, or the two cylinders 1, 2,
may be attached to one crank or otherwise and the valves may be worked
by any approved gearing.
Having thus particularly described our said Invention, and the manner
in which the same is to be performed, we have to state that what we
believe to be novel and original, and claim as secured to us by the herein-
before in part recited Letters Patent is, the combining in compound
steam engines of rectilineally sliding valves to admit steam into the high-
pressure' cylinders with cylindrical valves for transferring the steam to
the low-pressure cylinder as herein-before described.
In witness whereof, I, the said William Inglis, on behalf of myself
and the said John Frederick Spencer, have hereunto set my hand
and seal, this Seventh day of September, in the year of our Lord
One thousand eight hundred and seventy-one.
TTT TTAMEr THAT TO
זזוד
TT IL
LADE
INGLIS.
(L.S.)