IMPROVEMENTS IN STEAM ENGINES
Year: 1879

page_text: LETTERS PATENT to David Greig, of the Steam Plough Works, Leeds, in the
County of York, Wilson Hartnell, of Benson's Buildings, Park Row, Leeds, in
the said County of York, and William Daniel, of the said Steam Plough Works,
Leeds, for the Invention of "IMPROVEMENTS IN STEAM ENGINES."
Sealed the 18th July 1879, and dated the 1st February 1879.
PROVISIONAL SPECIFICATION left by the said David Greig, Wilson Hartnell,
and William Daniel at the Office of the Commissioners of Patents on the 1st
February 1879.
DAVID GREIG, of the Steam Plough Works, Leeds, in the County of York, WILSON
HARTNELL, of Benson's Buildings, Park Row, Leeds, in the said County of York,
and WILLIAM DANIEL, of the said Steam Plough Works, Leeds. "IMPROVEMENTS
IN STEAM ENGINES."
This Invention has for its object a construction which secures the utmost economy
of fuel, and at the same time is free from complication, and retains the advantages
of the ordinary double cylinder semi portable engine for winding, hauling, pumping,
and other general purposes.
This is effected by placing a pair of engines side by side on a suitable base plate
or frame, which also carries a locomotive multitubular boiler secured to it, and in
part resting on the engines. The cylinder of one engine is larger than that of the
other, so that the steam is expanded from the smaller through the larger
cylinder.
To facilitate starting and reversing an intermediate valve is provided, whereby
steam may be admitted direct into the valve chamber of the larger cylinder if
required; this valve may be so arranged that it is brought into action by putting
the reversing lever a little beyond the position for running the engine with the
slide valves in full gear, so that no secoud handle is required to open the inter-
mediate valve.

page_text: The same object can be effected by giving to the starting handle a longer travel
han is required to open the starting valve to its full area, the additional movement
being made to open the intermediate valve.
In combination with this arrangement the cylinders may be made with or with-
out steam jackets, and for simplicity may be cast together with valve chests to the
outside for easy access to the valves.
For some purposes, to secure strength and lightness; we prefer-to-construct-the-
cal connected

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said David Greig, Wilson Hartnell, & William Daniel in the Great Seal
Patent Office on the 1st August 1879.
DAVID GREIG, of the Steam Plough Works, Leeds, in the County of York, WILSON
HARTNELL, of Benson's Buildings, Park Row, Leeds, in the said County of York,
and WILLIAM DANIEL, of the said Steam Plough Works, Leeds. "IMPROVEMENTS
IN STEAM ENGINES."
This Invention has for its object a construction which secures the utmost economy
of fuel, and at the same time is free from complication, and retains the advantages
of the ordinary double cylinder semi-portable engine for winding, hauling, pumping,
and other general purposes.
This is effected by placing a pair of engines side by side on a suitable base
plate or frame, which also carries a locomotive multitubular boiler secured to it,
and in part resting on the engines. The cylinder of one engine is larger than that
of the other, so that the steam is expanded from the smaller through the larger
cylinder.
To facilitate starting and reversing an intermediate valve is provided, whereby
steam may be admitted direct into the valve chamber of the larger cylinder if
required; this valve may be so arranged that it is brought into action by putting
the reversing lever a little beyond the position for running the engine with the slide
valves in full gear, so that no second handle is required to open the intermediate
valve. The same object can be effected by giving to the starting handle a longer
travel than is required to open the starting valve to its full area, the additional
movement being made to open the intermediate valve.
In combination with this arrangement the cylinders may be made with or without
steam jackets, and for simplicity may be cast together with valve chests to the
outside for easy access to the valves.
For some purposes, to secure strength and lightness, we prefer to construct the
base plate of two longitudinal plates or bars of wrought iron or steel connected
together by suitable cross pieces.
Figure 1 of the Drawings represents a side elevation of a compound semi-portable
engine, constructed according to our Invention; Figure 2 is a plan of the same,
with the boiler removed; Figure 3 is a transverse section. a, a, is the bed frame;
at one end of it the high and low pressure cylinders b and c are mounted. The
piston in these cylinders are coupled by connecting rods, with cranks at right angles
on the crank shaft d; e is the boiler, supported at one end upon the cylinders, and
at the other (or fire box end) it is fixed directly to the frame a; f is the starting
handle; and g is the reversing lever. The arrangements in connection with these
parts by which boiler steam may at pleasure be admitted to the larger cylinder to
facilitate starting, are shown by other Figures.
Figure 4 represents a side view partly in section, and Figure 5 an elevation of
the arrangements within the boiler in connection with the starting handle. On the
axis h of the starting handle there is an arm, which by the link i is connected with
the slide . This slide covers and uncovers the mouth of the steam pipe leading
into the valve chest of the high pressure cylinder. The same slide, when a further
movement is given to the starting handle beyond what is necessary for the free
admission of steam to the pipe l, also uncovers the port m, from which a pipe then
leads boiler steam down to the valve chest of the low pressure cylinder; 6' and c¹
are the points at which the steam pipes are connected with the cylinder casting.
The parts for admitting steam to the low pressure cylinder when starting the engine
may be applied to the reversing lever in place of the starting handle. Figure 6 is
a side view partly in section of such an arrangement. n is an axis receiving motion
from the reversing lever; it has an arm upon it connected with the link o of the

page_text: eccentric link motion, which it controls in the usual way. In a convenient position
on the axis n there is also a cam piece p, which when the reversing lever is moved
further-over-than-is-requisite-for-placing-the-engine in forward or back-gear, acts
through a lever on a valve q, and lifting it allows boiler-steam to pass from the
valve chest of the high pressure cylinder into the exhaust passage which commu-
-nicates-with-the-valve chest of the low-pressure-cylinder.
Having thus described the nature of the said Invention, and the manner of per-
-forming the same, we would have it understood that we claim,-
First. The engine as described in the Specification, and shown on the accom-
panying Drawing.
Second. The arrangement of valve worked from the reversing handle of the
engine for admitting steam direct from the boiler into the low pressure cylinder to
facilitate starting.
Third. The arrangement of valve worked from the regulator for admitting steam
direct from the boiler into the low pressure cylinder to facilitate starting.
In witness whereof, I, the said Wilson Hartnell, have hereunto set my hand
and seal, this Thirty first day of July, in the year of our Lord One thousand
eight hundred and seventy. nine.