IMPROVEMENTS IN THE MODE OF RAISING THE TEMPERATURE OF STEAM GENERATED IN STEAM BOILERS, AND USING THE SAME FOR WORKING STEAM ENGINES
Year: 1858

page_text: LETTERS PATENT to George John Parson, of Adelphi Terrace, Strand,
Gentleman, and Thomas Pilgrim, Engineer, of Bow, both in the County
of Middlesex, for the Invention of "IMPROVEMENTS IN THE MODE OF
RAISING THE TEMPERATURE OF STEAM GENERATED IN STEAM BOILERS, AND
USING THE SAME FOR WORKING STEAM ENGINES."
Sealed the 23rd April 1858, and dated the 3rd March 1858.
COMPLETE SPECIFICATION filed by the said George John Parson and
Thomas Pilgrim at the Office of the Commissioners of Patents, with
their Petition and Declaration, on the 3rd March 1858, pursuant to the
9th Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, GEORGE.
JOHN PARSON, of Adelphi Terrace, Strand, Gentleman, and THOMAS PILGRIM,
Engineer, of Bow, both in the County of Middlesex, do hereby declare that
the nature of the Invention of "IMPROVEMENTS IN THE MODE OF RAISING THE
TEMPERATURE OF STEAM GENERATED IN STEAM BOILERS, AND USING THE SAME
FOR WORKING STEAM ENGINES," and in what manner the same is to be per-.
formed, to be particularly described and ascertained in and by the following
statement, reference being had to the Drawings hereunto annexed and to the
letters and figures marked thereon (that is to say):-
Our Invention consists in taking the steam from the ordinary steam chest
of the boiler, and causing it to pass through and across the furnace, so that it,

page_text: may be further heated thereby before it enters the ordinary steam pipe leading
to the engine.
For this purpose there is connected to the ordinary steam chest a pipe
leading to another pipe which enters the back of the furnace through the
bridge, a regulating valve being inserted at the junction of these two pipes.
At the inner end of the latter or inlet pipe is connected another pipe extend-
ing along one side of the furnace from the bridge towards the front of the
furnace, and there is another similar pipe on the opposite side of the furnace.
These pipes are suitably supported by brackets, and have formed on their
upper side sockets for the insertion of a series of arched pipes or branches
extending across the fire bars. Stops are inserted in the two side bearing
pipes at the proper intervals to cause the steam as it enters from the inlet pipe
to pass across the fire by the first hollow arch, return by the second, and so on
alternately, through as many arches as may be required, into the further end
of the bearing pipe, and thence through the outlet pipe out of the furnace.
By this continuous pipe or succession of pipes the steam is made to pass from
the ordinary steam chest, enter the furnace, cross and recross the fire, and
pass out from the furnace in a superheated state, to be used as may be
required.
To the outlet pipe is connected a pipe with a regulating valve in it leading
to an additional steam chest or regulator for receiving the highly heated steam
as it leaves the furnace, the ordinary steam pipe for supplying the engine
being connected to this chest. Such being the nature of our Invention, we
will proceed to describe more particularly, by reference to the accompanying
Drawings, the manner in which the same is to be performed.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a longitudinal section of a boiler with our improvements applied
thereto, taken in an irregular line of Fig. 3; Fig. 2 is a transverse section of
the same, shewing two ordinary furnaces; Fig. 3 is a horizontal section of the
same, taken with reference to one furnace above the arches of the continuous
pipe, and with reference to the other being taken through them; Fig. 4 is a
longitudinal elevation of the boiler; Fig. 5 is a front elevation of the same,
and Fig. 6 is a back elevation of the same. In all these Figures the same
letters of reference indicate corresponding parts.
A, A, is the boiler; B, the ordinary furnace; C, the bridge; D, the
ordinary steam chest; E, the pipe communicating between the steam chest
D and the furnace; F is a regulating screw valve to be worked as required
by a handle, as shewn; Gis the continuous pipe or succession of pipes con-

page_text: nected to the pipe E; this pipe G passes through the bridge and into the
furnace; G1, G2, G3, G, are the several portions of the continuous pipe which
respectively form arches across the fire, the end of the first arched portion G¹
being connected to the pipe just in front of the bridge C, and the end of the
last G, being connected to the pipe leading out of the furnace; H, H, are
stops in the lateral communications between the ends of the arched portions
of the pipe G, by which the steam is prevented from passing along the
horizontal pipe, except as required, and made to pass through the arched
portions of the continuous pipe from side to side of the furnace. These stops
are arranged so that the steam on entering at the inlet pipe may be caused to
pass through the first arched portion over the fire, return, through the next,
and so on alternately, until it reaches the outlet pipe, being all the while
exposed to the action of the fire. I is a pipe connected to the outlet pipe or
portion of the continuous pipe G, and also to the steam chest K, which is
shewn separate from the boiler, but it may be made to form part thereof;
L is a screw valve to be worked by a handle for the purpose of regulating
the supply of steam from the heating pipe G to the chest K; M is the pipe
for the passage of the steam from the chest K to the cylinder of the engine.
The operation of the Invention is as follows:-Steam being generated
in the ordinary manner will collect in the ordinary steam chest D, whence it
will pass by the pipe E into the inlet pipe G, in quantity regulated by the
valve F. On arriving at the entrance to the arched portion G' it will be
prevented from continuing its horizontal course by the first stop H, and
caused to pass along G', across the fire, and the communication between Gi
and G² being open it will enter the latter and recross the fire, being prevented
from passing any farther horizontally by the second stop H, and the com-
munication at this side of the fire between G and G being open, the steam
will enter the latter, being prevented from proceeding horizontally by the
third stop H, and will again cross the fire and return by G, there being no
stop between G³ and G' at the side of the fire thus reached. From G* the
steam will pass along the outlet pipe G through the pipe I into the chest K
in quantity regulated by the valve L, and thence to the cylinder through the
pipe M. Hence it will be understood that the ordinary steam pipe will be
connected with the steam chest K instead of with the ordinary steam chest D
wherever the steam chest K may happen to be placed.
It may be here remarked that the Invention does not relate to any par-
ticular construction of boiler or furnace. In the Drawing it is shewn applied
to two furnaces, but this may be varied so long as the heating pipe G is of
the form described, and is placed in the furnace, and is made to communicate

page_text: with the ordinary steam chest so as to convey the steam therefrom through and
across the furnace, and deliver it after being thereby again heated to the
steam chest K. Also the number of arched portions of the pipe may be
varied as well as the form thereof to suit different furnaces..
Having thus described the nature of our Invention, and in what manner
the same is to be performed, we would have it understood that we do not
claim as of our Invention the reheating or superheating of steam generated
in the ordinary manner except when produced in the manner described; but
we claim the means, above described, of taking the steam from the ordinary
steam chest of the boiler, and causing a regulated quantity 'to pass along the
sides of the furnace, and across the same through a continuous pipe or suc-
cession of pipes in the manner described, so that it may be further heated
thereby before it passes to the cylinder of the engine.
In witness whereof, we, the said George John Parson and Thomas
Pilgrim, have hereunto set our hands and seals, the Third day of
March, in the year of our Lord One thousand eight hundred and
fifty-eight.
Witness,
WILLIAM SPENCE,
50, Chancery Lane.
GEORGE JOHN PARSON. (L.S.)
THOS PILGRIM.
(L.S.)