IM- PROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS AND GENERATING
Year: 1868

page_text: LETTERS PATENT to George Hartley and Paul Robertshaw, both
of Bradford, in the County of York, for the Invention of "IM-
PROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS AND GENERATING
Scaled the 1st December 1868, and dated the 4th June 1868.
PROVISIONAL SPECIFICATION left by the said George Hartley and
Paul Robertshaw at the Office of the Commissioners of Patents,
with their Petition, on the 4th June 1868.
We, GEORGE HARTLEY and PAUL ROBERTSHAW, both of Bradford,
in the County of York, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS AND
GENERATING APPARATUS IN CONNECTION THEREWITH," to be as follows :---
The object of our Invention is to produce steam in a manner more
economical than is usual and with a boiler and apparatus occupying
less space than usual.
For this purpose, although in some cases we use the heat produced
from fuel direct, in many cases we prefer to use illuminating gas as a.
substitute.

page_text: Our boiler we prefer to make of cylindrical formation with flat ends
provided underneath (where a horizontal one is used) with a chamber
which may be of elliptical formation, but which clips the boiler at the
sides (say near the centre of the same), and which is set along with
the boiler in the brickwork foundation, the ends of such chamber being
closed with the exception of slight air passages at either end. Within
this chamber are placed a series of rows of perforated gas pipes which
when lighted heat the boiler. Throughout the length of the boiler we
insert perforated tubes, such tubes by preference being of smaller
diameter at the one end (where they are closed) than at the end where
they enter, and being each provided outside the boiler with separate
taps or cocks, by which means water is admitted to them. Between
the end of the boiler where the tubes enter and the taps or cocks in
each of the tubes we place a valve through which passes a shaft rotated
by means of gearing, and which is perforated opposite cach valve
respectively so that the water is only admitted into the boiler through
one tube at a time. If desired the whole of the tubes may admit water
at the same time by substituting a shaft perforated accordingly. The
result of this first named arrangement is that upon the gas being lighted
in the chamber a small quantity of the outer air being admitted therein
by suitable means and the rotating shaft set in motion (the cocks or
taps being opened), water is admitted into the boiler through the
perforations in the tubes in the form of spray and the quantity admitted
may be readily adjusted, each tube admitting the same consecutively if
desired. We may here name that the tubes are supported by cross
Where fuel direct under the boiler as
stays through the boiler.
before alluded to is used some modifications of detail are of course
requisite.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Hartley and Paul Robertshaw in the 3
Great Seal Patent Office on the 4th December 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME; we, GEORGE
HARTLEY and PAUL ROBERTSHAW, both of Bradford, in the County of
. York, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her a
Letters Patent, bearing date the Fourth day of June, in the year of

page_text: our Lord One thousand eight hundred and sixty-eight, in the thirty-
first year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto us, the said George Hartley and Paul Robertshaw,
Her special licence that we, the said George Hartley and Paul
5 Robertshaw, our executors, administrators, and assigns, or such others
as we, the said George Hartley and Paul Robertshaw, our 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
THE CONSTRUCTION OF STEAM BOILERS AND GENERATING APPARATUS IN CONNECTION
THERE WITH," upon the condition (amongst others) that we, the said
George Hartley and Paul Robertshaw, our executors or administrators,
by an instrument in writing under our or their hands and seals, or under
the hand and seal of one of us or them, 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 imme
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said George Hartley, on behalf of
myself and the said Paul Robertshaw, do hereby declare the nature of the
said Invention, and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following
statement thereof, that is to say :-
The object of our Invention is to produce steam in a manner more
economical than is usual and with a boiler and apparatus occupying less
space than usual.
For this purpose, although in some cases we use the heat produced
from fuel direct, in many cases we prefer to use illuminating gas as a
substitute.
Our boiler we prefer to make of cylindrical formation with flat
ends provided underneath (where a horizontal one is used) with a
chamber which may be of elliptical formation, but which clips the boiler
at the sides (say near the centre of the same) and which is set along
with the boiler in the brickwork foundation, the ends of such chamber
being closed, with the exception of slight air passages at either end.

page_text: of the boiler for the purpose of letting out any water that may have
accumulated, the tap f on the top of the boiler being used for the
emission of atmosphere when commencing to create steam; letter E
denotes the chamber placed under the boiler and which clips the same,
say at or near the centre of the diameter of the same; letters e denote
the gas jets (where gas is used) the number of which are varied
according to the size of the boiler. In other respects ordinary fittings
are used.
Having now described and explained the nature of our Invention,
and in what manner the same is to be performed, we wish it to be
understood that what we claim as and of our Invention is, the
generation of steam by means of injecting water through perforated
tubes within a vessel, by preference of cylindrical formation, such vessel
being previously heated by illuminating gas where the same is used,
placed within a closed chamber (air admissions being of course made)
without confining ourselves to the precise mechanical details shown and
described, of course where ordinary fuel is used the usual system for
steam boilers as regards furnace arrangements must be applied.
In witness whereof, I, the said George Hartley, have hereunto set
my hand and seal, this Second day of December, in the year of
our Lord One thousand eight hundred and sixty-eight.
Witness to the said George Hartley's
signature,
PHILIP H. SHARP,
Patent Agent,
Leeds and Bradford.
GEORGE HARTLEY. (L.S.)