IMPROVE- MENTS IN STEAM ENGINES, WHICH IMPROVEMENTS ARE ALSO APPLICABLE W MACHTYNERY AD APPARATUS CONNECTED TO STEAM BOILERS."
Year: 1853

page_text: LETTERS PATENT to Thomas Stephen Holt, of Manchester, in the
County of Lancaster, Engineer, for the Invention of "IMPROVE-
MENTS IN STEAM ENGINES, WHICH IMPROVEMENTS ARE ALSO APPLICABLE
W
MACHTYNERY AD APPARATUS CONNECTED TO STEAM BOILERS."
PROVISIONAL SPECIFICATION left by the said Thomas Stephen
Holt at the Office of the Commissioners of Patents, with his
Petition, on the 14th May 1858.
I, THOMAS STEPHEN HOLT, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN STEAM ENGINES, WHICH IMPROVEMENTS
ARE ALSO APPLICABLE TO THE MACHINERY OR APPARATUS CONNECTED TO STEAM
BOILERS," to be as follows:-
My Invention relates, firstly, to improvements in the machinery or
apparatus for regulating the speed or motion of steam engines, working
either with or without expansion, and is applicable to governors or
similar apparatus for regulating motive power.
Secondly, to an improved eccentric for giving more or less lead and

page_text: throw, as may be necessary, for the purpose of working valves expansively
or otherwise.
Thirdly, to an improved valve with hollow spindle for regulating the
friction on the face by means of a centre spindle; this part of my
Invention is applicable to every description of disc valves, whether used
for the purpose of steam, water, or gases.
Fourthly, to a mercury guage, with an "improved overflow pipe or
receiver, so that if the steam should be raised above the indicated
pressure this my improved arrangement will prevent the mercury being
wasted; and
Fifthly, to an improved method of constructing or packing the pistons
of cylinders or pumps of any or every description
Having given an outline sketch or drawing of my said improve-
ments, I consider it unnecessary to give further particulars in this my
Provisional Specification, as any person conversant with the mechanism
in question will nuderstand the first part of my said Invention by
reference to Figures.1, 2, and 3. My second part by reference to
Figures 4 and 5. My third part by reference to Figures 6, and 7.
My fourth part by reference to Figure 8; and my fifth and last part
by reference to Figures 9, and 10, on the said accompanying outline
sketch or drawing.
-
'SPECIFICATION in pursuance of the conditions of the Letters-Patent,
filed by tlie said Thomas Stephen Flolt in the Great Seal Patent
Office, on the 14th November 1858...
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
THOMAS STEPHEN HOLT, of Manchester, in the County of Lancaster,
Engineer, send greeting.
1
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Royal Letters Patent, bearing date the Fourteenth day of May, in the
year of our Lord One thousand eight hundred and fifty-three, in the
'sixteenth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Thonia's Stephen Holt; Her especial
license that I, the said Thomas Stephen Holt, my executors, adini-

page_text: nistrators, and assigns, or such others as, the said Thomas Stephen
Holt, my executors,. administrators, or 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
of." IMPROVEMENTS IN STEAM ENGINES, WHICH IMPROVEMENTS ARE ALSO
APPLICABLE TO THE MACHINERY OR APPARATUS. CONNECTED TO STEAM
BOILERS," upon the condition (amongst others) that I, the said Thomas
Stephen Holt, should particularly describe and ascertain the nature
of my said Invention, and in what manner the same was to be
performed, by an instrument in writing under my hand and seal,.
and cause the saine to be filed in the Great Seal Patent Oflice within
six calendar months uext and immediately after the date of the said
Royal Letters Patent.
NOW KNOW YE, that I, the said Thomas Stephen Holt, do hereby
declare the nature of niy said Invention, and in what manner the same.
is to be performed, to be particularly described and ascertained in and
by the following statement, reference being had to the accompanying.
sheet of Drawings, in which the same letters of reference are used to
represent similar parts where different views or diagranis are shewn
(that is to say):
My Invention relates, firstly, to improvements in the machinery
or apparatus for regulating the speed or motion of. steam engines,
working either with or without expansion, and which are applicable to
governors or similar apparatus for regulating motive power. Secondly,
to an improved eccentric for giving more or less lead and throw by
means of an eccentric bush, which can be altered when in or out of
motion for the purpose of working valves, pumps, or similar apparatus
either expansively or otherwise. Thirdly, to an improved valve with
hollow spindle for regulating the friction on the face by means of a
centre spindle. This part of my Invention is applicable to every
description of disc valves, whether used for the purposes of stean, water,
or gases. Fourthly, to a mercury guage, with an improved overflow

page_text: pipe or receiver, so that if the steam should be raised above the indicated
pressure this my improved arrangement will prevent the mercury
being wasted. And, Fifthly, to an improved method of expanding the
packing or packings of pistons for cylinders or pumps, of any or every
description, by means of two inclined links without vees or wedges.
Fig. 1, in the accompanying sheet of Drawings is a side elevation of
my improved regulator for steam engines; Fig. 2, a front view of the
same. Fig. 3, a plan thereof; and Fig. 4, a plan of the clutch and
box. a, represents the frame for holding the gearing; b, the governor
rod or spindle, which is for the purpose of driving the bevil pinion d,
and also for working the clutch e, into the clutch boxes f, in the face of
the bevil pinion; thus reversing the motion of the wheel 9. and keeping
the engine at an equal speed in connection with the governor. On one
end of the shaft h, is keyed the wheel g, and upon the other end the
pinion J, which pinion drives the wheel k; in the face of this
wheel is formed a slot, to allow the two studs 1, to be carried to
or from the centre of the wheel k, as may be required, to give a
long or short motion to the rod m; this rod is made to forin a
double incline n, and a groove or gab o, to admit either of the two
studs to work into the groove, and give motion to the rod as occasion
may require, by their regular velocities of the governor. Upon the rod
m, are the two bosses p, with the two set screws Q, which can be set
to give the required motion, and then made fast upon the rod m, which
may be connected to any description of valve or expansion gear re-
quiring the self-acting regulator. Figs. 5, and 6, are sectional views
of the valve box and plan of face; this regulator feed or steam valve
is made with a hollow spindle a, of brass or any suitable inetal, with
the lever b. keyed upon one end, and the valve c, keyed on the other
end. Through the centre of this spindle passes a solid spindle d,
screwed on one end e, and made square at f, so as to be regulated by a
screw key against the foot g, by which means the two faces h, can be
regulated to work with the least possible amount of friction with the full
pressure of steam, gas, water, or any other fluid, without disturbing the
valve cover i. Fig. 7, is an elevation of my improved steam guage;

page_text: ", represents the steam pipe from the boiler or steam vessel; b, the
gland to connect the pipe; c, the condensed water tap; d, the three-
wayed tap for shutting off the steam and allowing the mercury to pass
into the guage; e, the pipes that contain the mercury; f, the glass pipe
with overflow at the top, which indicates the pressure on the index g;
h, the receiver, in case the steam is raised above the indicated pressure;
i, the branch pipe for alarum whistle. Figs. 8, and 9, are plans of the
metallic piston; a, represents the piston; b, the packing; c, the straps;
d, the cross bar; e, the sockets; f, the regulating screws; /, the guide
for the spiral or any other kind of springs. Figs. 10, and 11, are
plans of the eccentric, which can be regulated by the self-acting regu-
lator, as shown in Figs. 1, 2, 3, and 4, to give any required throw or
lead to the valve, by being connected to the rod m; the plate a, is
keyed fast upon the fly-wheel shaft ; c,' is a stud made fast to the
plate a, on which stud revolves the friction pulley d, which drives the
pinion e; the friction pully is made to revolve backwards or forwards
by the brackets f, upon the rod m. The brackets, and also the
pully d, are covered with leather or other suitable material to cause
the necessary friction, or may be worked with gearing, if preferred.
The pully d, being driven with gearing or friction, works the pinion e,
which drives the wheel g; on the face of this wheel is an eccentric
boss h, which fits into the eccentric tumbler i; when the wheel g,
revolves it increases or decreases the throw of the eccentric tumbler,
thus causing the valves to work expansively; the stud j, is the driver or
carrier for the eccentric tumbler; this stul works into the groove or
slot k, formed in the face plate a, to give the required lead.
Having thus fully described the nature and particulars of my said
improvements, and the manner of carrying the same into practical
effect, I desire it to be distinctly understood that I do not confine myself
to the exact details thereof, as such may be varied or modified without
departing from the principle of the same; but I claim as of my
Invention, firstly, the improved self-acting regulator. Secondly, the
improved eccentric. Thirdly, the improved valve. Fourthly, the im-
proved mercury guage; and, fifthly, the improved method of expanding

page_text: the packing or packings of pistous, as all of such improvements. are
herein severally described and illustrated. in the, accompanying shect.
of Drawings:
i
In witness whereof, I, the said Thomas Stephen Holt, have
hereunto set my hand and seal, this Twelfth day of November,
One thousand eight hundred and fifty-three.
THOMAS STEPHEN HOLT. (L.S.)
Signed, sealed, and delivered
by the within-named Tho-
mas Stephen Holt in the
presence of
E. J. HUGHES,
Patent Agent,
Manchester.