IMPROVEMENTS IN STEAM BOILERS
Year: 1867

page_text: LETTERS PATENT to John Charles Wilson, of 5, Lime Street, in the
City of London, Civil and Mechanical Engineer, for the Invention of
"IMPROVEMENTS IN STEAM BOILERS."
Sealed the 9th April 1868, and dated the 11th October 1867.
PROVISIONAL SPECIFICATION left by the said John Charles Wilson at
the Office of the Commissioners of Patents, with his Petition, on the
11th October 1867.
1, JOHN CHARLES WILSON, of 5, Lime Street, in the City of London, Civil
and Mechanical Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN STEAM BOILERS," to be as follows:-
This Invention has reference to the mode of constructing the flues of steam
hoilers so as to render them more convenient for repairs, and to the addition
of small water tubes to steam boilers so as to increase their steam generating
power.
The flues are constructed with a conical or bell-shaped mouth at one end
sufficiently large to permit of their withdrawal or insertion through that end
of the boiler, by this means they can be easily removed for repairs, &c. Small
water tubes are added to steam boilers by placing them inside the flues or
outside the shells of the boilers, one end of the said tubes being connected
with and open to the water space, and the other end to the steam space of
the boiler, by this means ordinary steam boilers may be greatly increased in
power for a trifling expense.

page_text: SPECIFICATION in pursuance of the conditions of the Letters atent, med
by the said John Charles Wilson in the Great Seal Patent Office on the
11th April 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, Joux
CHARLES WILSON, of 5, Lime Street, in the City of London, Civil and
Mechanical Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eleventh day of October, in the year of our Lord One
thousand eight hundred and sixty-seven, in the thirty-first year of Her reign,
did for Herseif, Her heirs and successors, give and grant unto me, the said
John Charles Wilson, Her special licence that 1, the said John Charles Wilson,
my executors, administrators, and assigns, or such others as I, the said Jolm
Charles Wilson, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and atall 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 STEAM BOILERS,"
upon the condition (amongst others) that I, the said John Charles Wilson,
my executors or administrators, by an instrument in writing under my, or
their, or one of their hands and seals, should particularly describe and ascer-
tain 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 Charles Wilson, do hereby declare
the nature of the said Invention, and in what manner the same is to be per
formed, to be particularly described and ascertained in and by the following
statement thereof:-
My Invention consists, firstly, in constructing the flues of steam boilers
with a conical or bell-shaped mouth at one end sufficiently large to permit of
the withdrawal or insertion of the flues through that end of the boiler. Fig. 1
of the accompanying Sheet of Drawings illustrates the same. The base of the
cone is made large enough to exceed the diameter of the flue measured over
the heads of the rivets at the joints or of any other projection upon it, so that
by simply knocking out the row of rivets at A(and also of course another row
at the other end) the flue may be easily withdrawn without further injury to the
boiler; this saves the removal of the end plate B as has been hitherto required
for this purpose. The angle iron at A may be placed outside instead of inside

page_text: the boiler, as shewn by the dotted lines, or the plate B may be flanged in the
manner known to boiler makers.
Secondly, my Invention consists in the addition of small water tubes to
boilers so as to increase their power, one end of the said tubes being open to
the water space and the other to the steam space of the boiler. Fig. 2 of the
accompanying Sheet of Drawings illustrates this addition to a plain cylindrical
boiler tired underneath; Fig. 3, the same to a Cornish boiler; and Fig. 4, the
same to a marine boiler. The same letters apply to the same parts in the
different Figures.
A, A, are the steam ends of the tubes; B, B, the water ends; and C, C, the
tubes themselves exposed to the full heat of the fire. They are easily fastened
to the boiler at each end by means of the ordinary screws and nuts. The
addition of these tubes adds greatly to the power of the boilers, but they would
be almost altogether inefficient without the projection of the ends A into the
steam space, this point of the arrangement causing a rapid circulation of the
water through the tubes by the buoyant power of the steam as it escapes
through the ends A, throwing out the water also at those ends, and gravity
sending a fresh supply through the other ends B, B, to replace it. This
action continues as long as the fire is in operation, and is always in direct
proportion to its heat.
Having now described the nature of my said Invention, and in what manner
the same is to be performed, I declare that I claim as my improvements in
steam boilers,-
Firstly. Constructing the flues with a conical or bell-shaped mouth at one
end so as to facilitate their removal for repairs, &c.
And, secondly, adding small water tubes to cylindrical, Cornish, and marine
boilers, with one end open to the steam space and the other to the water
space of the boiler, all substantially in manner herein-before described.
In witness whereof, I, the said John Charles Wilson, have hereunto set
my hand and seal, this Eleventh day of April, One thousand eight
hundred and sixty-eight.