IMPROVEMENTS IN MARINE AND OTHER STEAM ENGINES ON THE HIGH AND LOW PRESSURE COMPOUND PRINCIPLE
Year: 1875

page_text: PROVISIONAL SPECIFICATION left by Henry Turner at the Office of
the Commissioners of Patents, with his Petition, on the 18th
September 1875.
I, HENRY TURNER, of the Canada Works, Birkenhead, in the County
of Chester, and of 14, Eaton Road, Claughton, also in the County of
Chester, Managing Engineer, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN MARINE AND OTHER STEAM ENGINES ON THE
HIGH AND LOW PRESSURE COMPOUND PRINCIPLE," to be as follows :—
My Invention relates to the construction of marine and other steam
engines on the high and low pressure compound principle, whereby
economy of space, simplicity and compactness of construction, and
saving of parts, together with durability and efficient working action are
obtained.
A pair of engines constructed according to this Invention are so
arranged that the space occupied is very little, if any, in excess of the
tokon un hy en ordinary single high and low pressure compound

page_text: In order that my Invention may be understood I will describe how it
may be applied to the construction of a pair of vertical or tilt hammer
engines, but it will be evident to any practical engineer that my
Invention is capable of modifications of position, such as horizontal or
diagonal.
In constructing a vertical pair of engines according to my Invention
I use a low-pressure cylinder of ordinary type, for example, of say fifty-
four inches diameter. Over the low-pressure cylinder, and on the top
or end thereof, I place a high-pressure cylinder of say thirty inches
diameter. The centre line of the piston and piston rod of such high-
pressure cylinder I arrange to come over and through a point some-
where between the centre of the low-pressure cylinder and the
circumference or packing ring of the piston of such cylinder. These
cylinders, being the high-pressure cylinder and the low-pressure cylinder,
are supported by a suitable framework, part of which may be the con-
denser or otherwise.
The framework stands upon or joins on to a bed plate, frame, or
entablature, which forms the bearings for and carries the engine crank
shaft. This crank shaft is so arranged that one crank pin is on a centre
line corresponding with the centre line of the low-pressure cylinder, and
the other crank pin is on a centre line corresponding with the centre
line of the high-pressure cylinder, both centre lines coming within the
half diameter of the low-pressure cylinder.
The double crank consists of three webs, namely, a central web con-
necting the two crank pins, which are at-a right or 'other suitable angle
to each other, and a web on the outside of each crank pin respectively.
The journals of the crank shaft are formed on each side of the outside
webs of each crank pin respectively, and are carried by corresponding
-bearings-formed-in-the bed plate, frame, or entablature.
The piston rod of the low-pressure cylinder is connected to and drives
-one-crank-by-a-suitable-connecting-rod,-and-the-piston rod of the high-
-pressure-cylinder-passes through a stuffing box in the cover of the low-
pressure cylinder, through the low-pressure cylinder, through the piston
of the low-pressure cylinder (which is provided with a suitable packing
medium, either metallic or otherwise), and through a stuffing box in the
bottom or end of the low-pressure cylinder, and is then connected to
and drives the other or second crank of the engine. It will be seen

page_text: that by this arrangement of parts I arrive at a double engine, or an
engine which works and is connected to two crank pins set at different
angles, one having a lead over the other, and that an engine so con-
structed occupies equal or nearly equal space with an ordinary single
engine of the compound type, where one cylinder is placed over or at
the end of the other. Also by this arrangement the same framework
used for carrying a single cylinder, or the two cylinders of the ordinary
single compound engine type, will carry the two cylinders, that is, tho
high and low pressure cylinders of an engine constructed according to
my Invention, being a double cylinder combined compound engine with
the cranks.at a right or any other angle. Also the two bearings used in
the ordinary type are still only necessary in my improved type, whereas
in ordinary double compound engines three or four bearings are required.
All the other attendant parts, such as foundation frames, guides,
columns, and other accessories are simplified and reduced in number.
The exhaust steam is led in the usual way from the high-pressure
cylinder to the low-pressure cylinder through suitable passages, and the
valve gear of both cylinders may be of similar description to valve.
gears now in use for single or other compound engines.