IMPROVEMENTS IN GOVERNOR APPARATUS FOR COMPOUND MARINE STEAM ENGINES
Year: 1873

page_text: LETTERS PATENT to Hazelton Robson Robson, of Glasgow, in the County
of Lanark, North Britain, Engineer, for the Invention of "IMPROVE-
PROVISIONAL SPECIFICATION left by the said Hazelton Robson Robson
at the Office of the Commissioners of Patents, with his Petition, on
the 13th June 1873.
I, HAZELTON ROBSON ROBSON, of Glasgow, in the County of Lanark,
North Britain, Engineer, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN GOVERNOR APPARATUS FOR COMPOUND MARINE
STEAM ENGINES," to be as follows, that is to say :—
This Invention has for its object the more effective and satisfactory
application of governors for preventing the racing of marine steam
engines when the engines are of the kind commonly known as
compound.

page_text: Hitherto such governors have generally been made to act on a valve
or valves limiting the supply of high pressure steam to the high pressure
cylinder or cylinders; but it often happens in practice that sufficient
control is not obtainable in that way in consequence of there being
sufficient steam in the valve casing of the low pressure cylinder to
continue for a short time to move the low pressure piston with little
or no diminution of speed.
By the present Invention one or more valves are arranged so as to
intercept the steam between the high pressure cylinder and the low
pressure cylinder, in addition to the usual governor valve or valves, and
worked by the governor in a similar manner, so that when the governor
acts it will completely control the action of the steam in the low
pressure as well as in the high pressure cylinders.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Hazelton Robson Robson in the Great Seal Patent
Office on the 12th December 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HAZELTON
ROBSON ROBSON, of Glasgow, in the County of Lanark, North Britain,
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirteenth day of June, in the year of
our Lord One thousand eight hundred and seventy-three, in the thirty-
sixth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Hazelton Robson Robson, Her special licence
that I, the said Hazelton Robson Robson, my executors, administrators,
and assigns, or such others as I, the said Hazelton Robson Robson,
my executors, administrators, and assigns, should at any time agree with,
and no others, from time to time and at all times thereafter during the
term therein expressed, should and lawfully might make, use, exercise,
and vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
GOVERNOR APPARATUS FOR COMPOUND MARINE STEAM ENGINES," upon the

page_text: condition (amongst others) that I, the said Hazelton Robson Robson,
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 Hazelton Robson Robson, 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 in writing, reference being had to the
accompanying Drawings, that is to say :-
My said Invention has for its object the more effective and satisfactory
application of governors for preventing the racing of marine steam
engines when the engines are of the kind commonly known as
"compound."
Hitherto such governors have generally been made to act on a valve
or valves limiting the supply of high pressure steam to the high
pressure cylinder or cylinders; but it often happens in practice that
sufficient control is not obtainable in that way in consequence of there
being as much steam in the valve casing of the low pressure cylinder
or having access to that valve casing as will continue for a short time
to move the low pressure piston with little or no diminution of speed.
By my present Invention I arrange one or more valves so as to
3 intercept the steam between the high pressure cylinder and the low
pressure cylinder, such valve or valves being worked by the governor
like the throttle or governing valve or valves usually applied, so that
when the governor acts it will completely control the action of the
steam in the low pressure cylinder. This low pressure governor valve
may be used in addition to the ordinary high pressure one; or it may
in some cases be used with advantage alone or without the ordinary
one, since it not only controls the ingress of the steam into the low
pressure cylinder but also the egress of the steam from the high
pressure cylinder. In cases in which the steam is expanded in three

page_text: or more successive cylinders additional governor valves may be used to
control the steam supply to the third or other cylinder.
And in order that my said Invention, and the manner of performing
the same, may be properly understood I hereunto append a Sheet of
explanatory Drawings, to be herein-after referred to, and representing
a modification of my low pressure governor valve, as applied in the
case of compound engines. In these Drawings the same reference
numerals are used to mark the same or like parts wherever they are
repeated.
Figure 1 is a section, as taken through the intermediate or low
pressure valve casing 1, 2, between the high pressure cylinder 3 and
low pressure cylinder 4, of a two cylinder compound marine steam
engine, one side only of each of the cylinders 3, 4, being shown. A.
pair of valves 5 of the butterfly type are applied for enabling the
governor to control the supply of steam to the low pressure slide valve 6,
these valves being arranged to work in ports 7 in a diaphragm plate 8
fixed across the valve casing or steam chest 1, 2, and behind the slide
valve 6.
Figure 2 is a face view of the diaphragm plate 8, with the ports 7
and governor valves 5.
Figure 3 is an inverted sectional plan, showing the low pressure
slide valve 6, the diaphragm plate 8, one of the governor valves 5, and
its port 7.
The governor valves 5, which are by preference of brass, are fixed
on and moved by a spindle 9, which passes through bearing eyes in
brass frames fixed on the ports 7, and the spindle 9 extends out through
a stuffing box and is connected to whatever kind of governor is
employed.
Having thus particularly described my said Invention, and the
manner of performing the same, I have to state that I do not restrict
myself to the precise details herein described or delineated, but that
what I believe to be novel and original, and claim as the Invention
secured to me by the herein-before in part recited Letters Patent
is, the fitting of compound marine steam engines with one or more
valves arranged to be actuated by a governor and to control the passage

page_text: of steam from one cylinder or cylinders to the other cylinder or
cylinders, substantially as and for the purpose herein-before described.
In witness whereof, I, the said Hazelton Robson Robson, have
hereunto set my hand and seal, this Tenth day of December,
in the year of our Lord One thousand eight hundred and seventy-
three.
Witness,
EDMUND HUNT,
Patent Agent,
Glasgow.
HAZN. R. ROBSON. (L.S.)