AN IMPROVEMENT IN GOVERNING MARINE ENGINES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, EUSTACE FITZMAURICE PIERS, Baronet, of 5 Westminstor Chambers West-
minster in the County of Middlesex, do hereby declare the nature of the said
invention for "AN IMPROVEMENT IN GOVERNING MARINE ENGINES" to be as
follows.:
My invention has for its chief object to reduce the "racing" of marine engines
due to the fluctuating resistance to which the screw propeller is subject. For this
purpose I provide in the steam cylinders of the engine or in connection therewith
one or moro ports, passages or pipes by which the ends of the cylinder can be
made to communicate with each other, and in connection with such passage
I provide a valve or valves connected to a governor, so that on the speed of the
engine rising above a certain maximum the valve will open the passage so as to
cause the steam to pass from the steam side of the piston to the exhaust side, and
thus equalise the pressure on both sides of the piston.
Or in place of causing the steam to pass from one side of the piston to the
other, the passage or passages and valves may be so arranged as to admit full
pressure steam to the exhaust side, suitable provision being made for previously
cutting off the communication with the condenser.
COMPLETE SPECIFICATION.
I, EUSTACE FITZMAURICE PIERS, Baronet, of 5 Westminster Chambers, West-
minster in the County of Middlesex do hereby declare the nature of the said
invention for "AN IMPROVEMENT IN GOVERNING MARINE ENGINES" and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :—
My invention has for its chief object to reduce the "racing" of marine engines

page_text: purpose I provide in the steam cylinders of the engine or in connection therewith
one or more ports, passages or pipes by which the ends of the cylinder can be
made to communicate with each other, and in connection with such passage
I provide a valve or valves connected to a governor, so that on the speed of the
engine rising above a certain maximum the valve will open the passage, so as to
cause the steam to pass from the steam side of the piston to the exhaust side, and
thus equalise the pressure on both sides of the piston.
The accompanying drawings show one mode of carrying my above described
invention into effect. Fig. 1 shews a plan, partly in section, of a compound marine
engine and Fig. 2 shews an end view, partly in section. The high and low pressure
cylinders A and B have each applied to them a cylindrical chamber C, communi-
cating near each end with the two ends of the cylinder by a passage D D³, and
containing two hollow piston valves E E¹ connected by a rod F which valves, in
the ordinary working of the engine, are situated in the position shewn, in which
they close the communications between the chamber and the cylinder. The rod of
those valves is connected either directly or indirectly to a governor so arranged
that so soon as a certain maximum speed is attained, the governor will cause the
valves to move rapidly in the direction of the arrow, thus uncovering the pas
sages D D¹ and consequently permitting the steam that is at the time acting on
one side of the piston G to pass through-the-chamber-Cand central opening of the
valve E¹ into the other end of the cylinder, thereby equalising the pressure on each
side of the piston. The parts of the chamber C opposito the passages D D³ are by
preference formed as open grids surrounded by an annular cavity, so as to give a
very free passage all round the valve for the escape of the steam.
--It-is-preferred to employ for the purposes of my said invention, a small governor
running at a high speed, and to cause this to act upon the valve-or-slide.of.a.small
steam cylinder the piston of which is connected to the rod of the valves E E' 60
as to insure a very sensitive and rapid action of the apparatus.
Having now particularly described and ascertained the nature-of-my-said
invention and in what manner the same is to be performed I declare that what
I claim is
1, The use in marine engines, of ports, passages or pipes establishing & com-
munication between both ends of the steam cylinder and having a valve or valves