IMPROVE- MENTS IN STEAM AND OTHER ENGINES
Year: 1875

page_text: LETTERS PATENT to Cemer Thomas Colebrook, of 44, Arlington
Square, in the County of Middlesex, for the Invention of "IMPROVE-
MENTS IN STEAM AND OTHER ENGINES."
Sealed the 6th October 1875, and dated the 17th April 1875.
PROVISIONAL SPECIFICATION left by the said Cemer Thomas Colebrook
at the Office of the Commissioners of Patents, with his Petition,
on the 17th April 1875.
I, CEMER THOMAS COLEBROOK, of 44, Arlington Square, in the County
of Middlesex, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN STEAM AND OTHER ENGINES," to be as follows:-
This Invention has for its object improvements in engines to be
driven by steam or other fluid under pressure. For this purpose I
employ a trunk engine, but in place of the trunk working through a
stuffing box at the end of the cylinder I form or fix above the end of
the cylinder a second cylinder, and form the outer end of the trunk to
carry piston rings or packing to fit steam-tight within such cylinder.
This cylinder is also at the top formed with bearings to carry the crank

page_text: shaft, so that no separate standards have to be provided for carrying
this shaft.
When steam is to be used expansively for working the engine I
arrange the valve to admit steam to the annular space between the
trunk and cylinder for effecting the down stroke, whilst the bottom of
the cylinder is open to the exhaust, and at the end of the stroke the
steam in this annular space is allowed to expand into the cylinder below
the piston to effect the up stroke. When a slide valve is used for
admitting steam to the cylinder this may be effected by causing the end
of the valve to alternately cover and uncover a port for admitting steam
to the annular space, and by forming and moving the valve in such
manner that after steam has been shut off from the annular space the
steam contained in such space shall be allowed to pass to the opposite
end of the cylinder through an arched passage in the valve; or steam
may be at all times admitted freely to the annular space, and the
lower end of the cylinder be alternately supplied with steam, and
opened to the exhaust, as has before been proposed for working trunk
engines.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Cemer Thomas Colebrook in the Great Scal Patent
Office on the 15th October 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CEMER
THOMAS COLEBROOK, of 44, Arlington Square, in the County of Mid- 2
dlesex, send grecting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Seventeenth day of April, in the
year of our Lord One thousand eight hundred and seventy-five, in tho
thirty-eighth year of Her reign, did, for Herself, Her heirs and successors, 3
give and grant unto me, the said Cemer Thomas Colebrook, Her special
license that I, the said Cemer Thomas Colebrook, my exccutors, admini-
strators, and assigns, or such others as I, the said Comer Thomas
Colebrook, my exccutors, administrators, and assigns, should at any time

page_text: agree with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make,
usc, 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 AND OTHER ENGINES," upon the condition
(amongst others) that I, the said Cemer Thomas Colebrook, 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 immediately after the
date of the said Letters Patent.
NOW KNOW YE, that I, the said Cemer Thomas Colebrook, do hereby
declare the nature of the said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement thereof, that is to say:—
This Invention has for its object improvements in engines to be driven
by steam or other fluid under pressure. For this purpose I employ a
trunk engine, but in place of the trunk working through a stuffing box
at the end of the cylinder I form or fix above the end of the cylinder a
second cylinder, and form the outer end of the trunk to carry piston
rings or packing to fit steam-tight within such cylinder.
When steam is to be used expansively for working the engine I
arrange the valve to admit steam to the annular space between the
trunk and cylinder for effecting the down stroke whilst the bottom of
the cylinder is open to the exhaust, and at the end of the stroke the
steam in this annular space is allowed to expand into the cylinder below
the piston to effect the up stroke. When a slide valve is used for
admitting steam to the cylinder this may be effected by causing the end
of the valve to alternately cover and uncover a port for admitting steam
to the annular space, and by forming and moving the valve in such
manner that after steam has been shut off from the annular space the
steam contained in such space shall be allowed to pass to the opposite
end of the cylinder through an arched passage in the valve; or steam
may be at all times admitted freely to the annular space, and the
lower end of the cylinder be alternately supplied with steam, and
opened to the exhaust, as has before been proposed for working trunk
engines.

page_text: The engine may be constructed either as a vertical engine or horizontal
engine, or to work in pairs, or as a three cylinder engine.
In order that my Invention may be fully understood I have shown in
the Drawing hereunto annexed an example of a trunk engine constructed
according to my Invention. The Drawing shows a vertical section of so 5
much of the engine as is necessary.
A is the steam cylinder, with a piston B working therein; O is the
trunk provided at its outer end with packing rings D fitting steam-tight
within a cylinder E fixed or formed upon the end of the cylinder A.
For small sizes the two cylinders may be formed together in one piece, 1
but for large sizes I prefer to form them separate, and connect them by
bolts and nuts; F is a casing of thin sheet metal surrounding the
cylinders A and E; G is the connecting rod for driving the crank shaft ;
I, the slide valve worked by an eccentric on the shaft.
With the valve shewn by the Drawing the in stroke is effected by 1
steam admitted to the annular space between the cylinder A and
trunk C, and the out stroke by expanding this steam into the cylinder A
above the piston. Other forms of slide valves may however be used, or
other means adopted for controlling the admission of steam to the two
ends of the cylinder A.
2
Having thus described the nature of my Invention, and the manner of
performing the same, I would have it understood that I claim, the con-
struction of trunk engines with the outer end of each trunk carrying
piston rings or packing to work steam-tight within a cylinder fixed or
formed on the end of the steam cylinder, substantially as herein-before 2
described.
described.
In witness whereof, I, the said Cemer Thomas Colebrook, have
hereunto set my hand and seal, this Fourteenth day of October,
in the year of our Lord One thousand eight hundred and seventy-
fren