IMPROVEMENTS IN STEAM ENGINES
Year: 1864

page_text: LETTERS PATENT to George Haseltine, of the "International Patent
Office," No. 12, Southampton Buildings, Chancery Lane, in the County
of Middlesex, Civil Engineer, for the Invention of "IMPROVEMENTS IN
STEAM ENGINES."-A communication from abroad, by Thomas Silver; of
New York City, United States, but now residing at Paris, in the Empire
of France"
Sealed the 28th February 1865, and dated the 4th October 1864.
PROVISIONAL SPECIFICATION left by the said George Haseltine at the
Office of the Commissioners of Patents,, with his Petition, on the 4th
October 1864:
I, GEORGE HASELTINE, of the "International Patent Office," No. 12, South-
ampton Buildings, Chancery Lane, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of the said Invention for "IM-
PROVEMENTS IN STEAM ENGINES," a communication, to be as follows:-
This Invention relates chiefly to a novel construction of the slide valve of a
steam engine, and to a peculiar device for operating or regulating the same.
The valve and. ports are so shaped that the supply of steam to one side of the
piston shall follow promptly the exhaust from the other, and the column of
supply be made relatively less than the column of exhaust.
These objects may be conveniently, and advantageously attained by con-
structing the ordinary slide valve of greater length, and forming a slot of any
desired shape or size in either end, through which slots the supply passes, a
portion of the steam port being covered by the sides of the valve ends, while
at the same time the full opening is given to the exhausting port.
Instead of

page_text: a slot in the ends of the slide valve a portion of the sides may be cut away,
leaving a tongue at the end for the bearing or partial port cover. A similar
result may be obtained by constructing the slide valve of greater length as
above, but instead of slotting its ends elongate a portion of the width of the
two ports in opposite directions, which portion only shall be uncovered by the
motion of the slide valve, and through which the steam shall be admitted
while the larger portion becomes the_exhaust._
circle, with a joint in the
The end of the valve rod
In the peculiar arrangement of link motion employed for reversing or con-
trolling the throw of the slide valve the link is of the ordinary form, but curved
internally to the valve rod constituting the arc of a
valve rod made near the steam chest as a centre.
may be fixed to this link at its middle, in which case the link itself must be
inoved either way in its circular direction to a required point to cause the
desired motion of the slide valve when the engine is'in motion; or the link may
be fixed so as to work or oscillate on a central pinion, the end of the valve rod
being fixed to a block which slides in the slot of the link, in which case the
position of this block-in the-slot controls the throw of the slide valve.When
this plan is adopted motion is given to the link by a single excentric connected
to either end of said link. When the link is made movable it is guided by
studs fixed on a disc or surface which supports also an adjusting gear. This
movable link is operated by the adjusting gear which consists of a ratchet fixed
or formed upon the rear edge of the link, into which ratchet works a toothed
pinion fixed to the disc. This pinion is turned by means of a larger outer toothed
wheel to which it is attached, or with which it is cast, the perimeter of said' outer
wheel reaching to the centre or axis of motion of the disc. Into the teeth of this
wheel works an adjusting screw, toothed rod, or other suitable.connection for
regulating the throw, of the valves. The disc is fixed on any, suitable bearing,
and receives its motion from a single excentric rod or its equivalent from, the
main shaft or other rotating part of the engine.
A
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said George Haseltine in the Great Seal Patent Office on the
4th April 1865.
!,
COME, I, GEORGE
TO ALL TO WHOM THESE PRESENTS SHALL
HASELTINE, of the International, Patent Office," No. 12, Southampton
Buildings, Chancery Lane, in the County of Middlesex, Civil Engineer, send
greeting.

page_text: . WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourth day of October, in the year of our Lord One
thousand eight hundred and sixty-four, in the twenty-eighth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said George Haseltine, Her special licence that I, the said George
Haseltine, my executors, administrators, and assigns, or such others as I, the
said George Haseltine, my executors, administrators, and assigns, should at
any time agree with, and no others, from time to time and at all times there-
after 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 "IMPROVE-
MENTS IN STEAM ENGINES," a communication, upon the condition (amongst
others) that I, the said George Haseltine, 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 George Haseltine, 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 chiefly to a novel construction of the slide valve of a.
steam engine, and to a peculiar device for operating or regulating the same..
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plan of a part of a steam engine arranged according to my
Invention; Figure 2 a side elevation of the same; Figure 3 is a side eleva-
tion, showing the fixed link and adjustable block; Figure 4 is a plan showing
the ordinary ports and a slide valve of a modified form; Figure 5 is a plan
showing an ordinary slide valve and ports of a modified form. Like letters
refer to corresponding parts in the several Figures.
The parts of an engine shown are secured to a bed plate A, Figures 1, 2,.
and 3; this plate, and the parts embracing my improvements, may be con-
structed of any suitable material and required dimensions. The slide valve B.
and ports C, shown in the several Figures, are so shaped that the supply of steam.
to one side of the piston shall follow promptly the exhaust from the other, and
the column of supply be made relatively less than the column of exhaust..
These objects may be conveniently and advantageously attained by constructing

page_text: the slide valve B of greater length, and forming a slot a of any desired shape
or size in each end, through which slots the supply passes, a portion of the port
C being covered by the sides of the valve ends, while at the same time the
full opening is given to the exhausting port. Instead of a slot in the ends of
the slide valve a portion of the sides may be cut away, as shewn in Figure 4,
leaving a tongue b at each end for the bearing surface or partial port cover.
A similar result may be obtained by constructing the slide valve of greater
length, as above, but instead of slotting its ends I elongate a portion of the width
of the two ports C in opposite directions as shown in Figure 5, which portion
only is uncovered by the motion of the slide valve B, and through which
elongation the steam is admitted while the larger portion of the ports becomes
the exhaust:
=
In the peculiar arrangement of link motion employed for reversing or con-
troling the travel of the slide valve B, the link D is, of the ordinary form, but
curved internally to the valve rod c constituting the arc of a circle with a joint
d in the valve rod c as a centre. The end of the valve rod may be fixed to the
link D at its centre, in which case this link. is moved either way in its circular
direction to a position for giving the required travel to the slide valve B when
the engine is in motion. When the link D is made moveable, it is guided by
studs f, fixed on a disc or surface G which supports also the adjusting gear
shown in Figures 1 and 2. The moveable link D is operated by this adjusting
gear, which consists of a rack g fixed or formed upon the rear edge of the link D,
into which rack gears a toothed pinion h working on a pin fixed to the disc G.
The pinion his turned by means of a worm wheel i, to which it is attached
or with which it is cast; the perimeter of the worm wheel i extending to the
centre or axis of motion of the disc G. Into the teeth of the worm wheel i
works an adjusting.screw j, toothed. rod, or other suitable connection for regu-
lating the travel of the valve B. The link D may be fixed if desired so as to
work or oscillate on a central pin or stud E, the end of the valve rod.c being
fixed to a block e which slides in the slot of the link D, in which case the
position of this block.e in the slot of the link D.controls the travel of the slide
valve B. When this plan is adopted, motion is given to the link D by a
single eccentric F, .connected to either end of said link. The disc G is fixed
to a shaft working in bearings 1, and receives its motion from the eccentric F
to which it is connected by the rod m or its equivalent. The excentric Fis
fixed on the shaft n.or other rotating part of the engine.
.
Having thus fully described said improvements, as communicated to me from
abroad, I claim as my Invention,-

page_text: First, constructing the slide valve B and ports C substantially in the
manner and for the purposes set forth..
Second, the combination and arrangement of parts for supporting and opera-
ting the link D substantially in the manner and for the purposes set forth.
In witness whereof, I, the said George Haseltine, have hereunto set
my hand and seal, this Third day of April, in the year of our Lord
One thousand eight hundred and sixty-five.
Witness,
ROWLAND GREEN.
GEORGE HASELTINE. (L.S.)