IMPROVEMENTS IN STRAM BOILERS.
Year: 1869

page_text: LETTERS PATENT to John Loader and William Henry Child; both of
Finsbury, in the County of Middlesex, for the Invention of
"IMPROVEMENTS IN STRAM BOILERS.">
Sealed the 13th July 1869, and dated the 16th January-1809..
PROVISIONAL SPECIFICATION left by the said John Loader and
William Henry Child at the Office of the Commissioners of Patents,
with their Petition, on the 16th January 1869.
We, JOHN LOADER and WILLIAM HENRY CHILD, both of Finsbury,
in the County of Middlesex, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN STEAM BOILERS," to be as follows :—
The main feature of our Invention consists in constructing steam
boilers with a steam chamber therein. We employ a shell or boiler
strong enough to withstand the strain, and we place therein a steam
chamber of corresponding form, so that a water space is left all round
the chamber between it and the shell; this chamber is made steam-
tight, except at the top, where an opening is made to receive a tube

page_text: which is fitted steam-tight to the chamber; the tube is open at the top
or is perforated near the top. As soon as steam is generated it passes
through the opening or perforations of the tube into the steam chamber.
The steam chamber may be situated either above or below the water
line, and may be fixed or allowed to float. Our Invention applies to
form of boiler, horizontal, conical, egg-ended, and others.
any
5
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Loader and William Henry Child in the
Great Seal Patent Office on the 16th July 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOHN
LOADER and WILLIAM HENRY CHILD, both of Finsbury, in the County
of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixteenth day of January, in the year
of our Lord One thousand eight hundred and sixty-nine, in the thirty-
second year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said John Loader and William Henry Child,
Her special licence that we, the said John Loader and William Henry
Child, our executors, administrators, and assigns, or such others as we,
the said John Loader and William Henry Child, our executors, adminis-
trators, 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 STRAM
BOILERS," upon the condition (amongst others) that we, the said John
Loader and William Henry Child, our executors or administrators, by
an instrument in writing under our, 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 John Loader, on behalf of myself
and the said. William Henry Child, do hereby declare the nature of the

page_text: 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 main feature of our Invention consists in constructing steam
boilers with a steam chamber therein. We employ a shell or boiler
strong enough to withstand the strain, and we place therein a steam
chamber of corresponding form, so that a water space is left all round
the chamber between it and the shell; this chamber is made steam-
tight, except at the top, where an opening is made to receive a tube
which is fitted steam-tight to the chamber; the tube is open at the top
or is perforated near the top. As soon as steam is generated it passes
through the opening or perforations of the tube into the steam chamber.
The steam chamber may be situated either above or below the water
line, and may be fixed or allowed to float. Our Invention applies to any
form of boiler, horizontal, conical, egg-ended, and others.
And in order that our Invention may be more clearly understood and
readily carried into effect we will proceed, aided by the accompanying
In the various Figures, of which similar parts are marked with similar
letters of reference, Figure 1 is a longitudinal section, and Figure 2 is a
cross section of a cylindrical egg-ended boiler having our improvements
applied thereto.
a, a, is the outer shell of the boiler, which is constructed in the usual
manner to withstand the strain to which it will be subjected; b, b, is a
steam chamber of corresponding form placed in the interior thereof in
such a position as to leave a space all round between it and the shell «.
The chamber b is made steam-tight, except at the top, where an opening
is mado to receive a tube c which is fixed thereto in any suitable
manner; this tube is open at the top or perforated as shewn. As soon
as steam is generated in the boiler it passes through the opening or
perforations in the tube c into the steam chamber b, whence it passes to
the outside of the boiler by a tube d, as shown, or in other suitable
manner.
Figure 3 is a section of another description of boiler having our
improvements applied thereto, and Figure 4 is a section of another.

page_text: description of boiler consisting of a number of small boilers (one only
of which is shewn) connected together by common steam, and water
connections e and f, as will be readily understood.
Although we have only shewn and described three forms of steam
boilers with our Invention applied thereto, we would remark that the
Invention is equally applicable to. other descriptions, of steam boilers,
such for instance as a number of small boilers similar to that shewn at
Figure 4, but placed vertically in a furnace, and connected together by
suitable steam and water connections. The steam chamber & may be
situated entirely below the water line, or it may be partly above and
partly below, and may be fixed or allowed to float; we prefer however to
fix it in position by means of ribs, stays, or other supports, as will be
readily understood, sufficient space or way being allowed all round such
chamber to permit of the free circulation of the water in the boiler. By
the use of this Invention steam is more rapidly generated, and the
circulation of the water in the boiler more effectually maintained, whilst
dry superheated steam is obtained, and the evils of a large body of water
in the boiler are to a great extent obviated.
Having thus described the nature of our said Invention, and the mode
in which the same may be carried into effect, we would have it under-
stood that we do not confine ourselves to the precise details herein shewn
and described, as such may be varied without departing from the peculiar
character of our Invention; but what we do claim is, the employment of
a steam chamber in the interior of a boiler, in manner substantially as
herein shewn and described.
In witness whereof, I, the said John Loader, have liercunto set
my hand and scal, this Second day of July, in the year of our
Lord One thousand eight hundred and sixty-nine.