Year: 1888

page_text: Date of Application, 9th Mar., 1888
Complete Specification Left, 8th Dec., 1888
Complete Specification Accepted., 5th Feb., 1889
I, PETER EVANS, of Drury Lane, Liverpool, in the County of Lancaster, Engineer
do hereby declare the nature of my said invention to be as follows:-
This Invention relates to the governing, or controlling of the supply of steam to
the cylinder, or cylinders of steam engines, and has for its object, chiefly to prevent the
"racing" of engines of navigable vessels, such "racing" being due to the lifting of
the propeller out, or towards the surface of the water as the ship pitches. To this
end my Invention consists as follows:-If an engine commences to run at a greater
than its normal velocity, or than that required, and if an air pump be connected such
moving part of such engine, the strokes of that air pump will increase in a given
time, and a consequent diminution or increase of pressure will be effected in the air
pump, or chamber connected with it. Now this diminution or increase of pressure
utilize to effectuate the movement of a suitable appliance, by which the steam supply
to the engines would be controlled. Namely, when the pressure within the air pump
or chamber diminishes, or increases, the steam supply would be more, or less cut off
and vice versa. This air pump may be a compressing, or exhausting pump. A con-
venient means by which I may utilize this pressure consists in forming communica-
tion by a pipe between the interior of the air pump, or its chamber and the interior
of a cylinder, or other chamber, which is provided with a suitable moveable part, such
part being connected to the throttle, or other valve, or "links" of the engine either
directly, or indirectly by means of an auxiliary valve and cylinder, or equivalent
device.
This device which is connected to the air pump, or chamber may consist of a cylinder
and piston, such piston being the moving part, or vice versa; or it may consist of a
chamber, having a flexible diaphragm which would be operated as the pressure varied
within it.

page_text: COMPLETE SPECIFICATION.
Improvements Connected with the Governing of the Speed of Steam
Engines.
I, PETER EVANS, of Drury Lane, Liverpool, in the County of Lancaster, Engineer,
do hereby declare the nature of my said invention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the following
statement:-
This Invention relates to the governing, or controlling of the supply of steam to
the cylinder, or cylinders of steam engines, and has for its object, chiefly to prevent
the "racing" of engines of navigable vessels, such "racing " being due to the lifting
of the propeller out of, or towards the surface of the water as the ship pitches. To
this end my Invention consists as follows:-If an engine commences to run at a
greater than its normal velocity, or than that required, and if an air pump be con-
nected to such moving part of such engine, the stroke of that air pump will increase
in a given time, and a consequent diminution, or increase of pressure will be effected
in the air pump, or chamber connected with it. Now this diminution or increase of
pressure I utilize to effectuate the movement of a suitable appliance, by which the
steam supply to the engines would be controlled. Namely, when the pressure within
the air pump or chamber diminishes, or increases, the steam supply would be more,
or less cut off and vice versa. The air pump may be a compressing or exhausting pump.
A convenient means by which I may utilize this pressure consists in forming communi-
cation by a pipe between the interior of the air pump, or its chamber, and the interior of
a cylinder, or other chamber, which is provided with a suitable moveable part, such part
being connected to the throttle, or other valve, or "links" of the engine, either
directly, or indirectly by means of an auxiliary valve and cylinder, or equivalent
device.
This device which is connected to the air pump, or chamber may consist of a
cylinder and piston, such piston being the moving part, or vice versa, or it may
consist of a chamber, having a flexible diaphragm which would be operated as the
pressure varied within it.
"
In the drawings which serve to illustrate my Invention I show one apparatus by
which my luvention may be conveniently carried out. The drawings consist of a
sectional elevation in Figure 1, showing a link of, say, a marine engine controlled by
a governor according to my Invention, and a plan, in Figure 2, of same.
With reference to the drawings, A is the link of the engine, B the valve rod, C
the eccentric rods, D an exhaust cylinder having a piston D' and connected to the
link a by a rod d¹. E is a spring to move the piston D' in one direction, and F is a
pipe communicating with the exhaust engine or a reservoir disposed between the
engine and the cylinder D.
In this instance the piston D' is operated by exhausting the air behind it, such
exhaustion being effected by any suitable air exhaust pump operated by the main
engine; thus when the main engines go faster than the speed required, the air pump

page_text: will exhaust more air from the cylinder, or from a reservoir connected with it, and
the pressure behind the piston D' will be diminished, and it will consequently be
pressed back, thereby pulling the link over towards their centre or neutral position,
and so limiting the supply of steam to the engine. As soon as the engine runs at its
normal speed, the spring E will press the piston outwards, as the pressure behind the
piston D' is raised by the slowing of the exhausting pump. Therefore it will be
obvious that the piston D will be constantly changing its position as the engines go
slower or faster.
"
.
29
"
The governor illustrated is designed to control the speed of the engine when going
in one direction only, say
ordinary drag-link-bars H.
ahead ; the " astern control being effected by the
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed I declare that what
I claim is :-
1. Effecting the governing of the speed of steam engines by means of an air com-
pressing or exhausting pump, worked by or through the engine whoso speed is to be
controlled, the compression or rarefaction caused by the said pump being employed
to act upon or in connection with a piston, diaphragm, or equivalent device substan-
tially in the manner set forth.
2. The combination with the "links,” or the “throttle" or other controlling valve
or device, of a steam engine, of a cylinder D and a piston D', said piston being
adapted to be operated by atmospheric pressure, substantially as set forth with
reference to the drawings.
PETER EVANS.
By Cheesbrough & Royston,
15, Water Street, Liverpool,
Patent Agents.