Ix- PROVEMENTS IN BOILERS FOR GENERATING STEAK."
Year: 1871

page_text: LETTERS PATENT to Isaac Watt Boulton, of Ashton-under-Lyne,
in the County of Lancaster, Engineer, for the Invention of " Ix-
PROVEMENTS IN BOILERS FOR GENERATING STEAK."
PROVISIONAL SPECIFICATION left by tho said Isaac Watt Boulton
at the Office of the Commissioners of Patents, with his Petition, on
the 1st April 1871.
I, ISAAC WATT BOULTON, of Ashton-under-Lyne, in the County of
Lancaster, Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN BOILERS FOR GENERATING STEAK," to be as follows:--
My Invention applies to boilers which may be used for stationary,
marine, locomotive, and other purposes where the axes of the flues
of the boilers run in a horizontal or diagonal position, and consists in
combining with the flues of such boilers, having either cylindrical or
stayed fire-boxes, a series of water tubes placed parallel to each other
in sets, each set being fixed across the flue in a plane at a right angle to
its axis, but with the tubes in a diagonal position and with the diagonal

page_text: inclination of the tubes reversed in each alternate set. By this arrange-
ment steam can be generated quickly and economically, and there is
a complete and rapid circulation of the fluid which descends more fully
to the under side of the flues, and produces a more uniform temperature
in them than is obtained in ordinary boilers, and consequently the
unequal strains upon the flues which tend so much to deteriorate steam
boilers are obviated. I prefer to secure the flues in which the tubes are
fixed by bolts and flanges to the shell of the boiler, and in some cases
to make the flues in sections formed of cylinders with flanges so as to
be bolted together, so that the flues or sections of flues containing tubes 1
can be readily removed for examination and can be casily repaired or
replaced when required.
"
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Isaac Watt Boulton in the Great Seal Patent
Office, on the 29th September 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ISAAC
WATT BOULTON, of Ashton-under-Lyne, in the County of Lancaster,
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the First day of April, in the year of i
our Lord One thousand cight hundred and seventy-one, in the thirty-
fourth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Isaac Watt Boulton, Her special
license that I, tho said Isaac Watt Boulton, my executors, adminis-
trators, and assigns, or such others as I, the said Isaac Watt Boulton, 2
my executors, adminstrators, 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 3
"IMPROVEMENTS IN BOILERS FOR GENERATING STEAM," upon the condition
(amongst others) that I, the said Isaac Watt Boulton, by an instru-
ment in writing under my hand and seal, should particularly describo
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 3

page_text: 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 Isaac Watt Boulton, 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 and the accompanying Drawings
(that is to say):-
i
My Invention applies to boilers which may be used for stationary,
marine, or locomotive, and other purposes where the axes of the flues
of the boilers run in a horizontal or inclined position, and consists in
combining with the flues of such boilers, having either cylindrical or
stayed fire-boxes, a scries of water tubes placed parallel to each other
in sets, each set being fixed across the flue in a plane at a right angle
to its axis, but with the tubes in a diagonal position, and by preference
with the diagonal inclination reversed in each alternate set. By this
arrangement steam can be generated quickly and economically, and there
is a complete and rapid circulation of the fluid which descends more
fully to the under side of the flue or flues, and produces a more uniform'
temperature in them and in the shells of the boilers than is obtained in
ordinary boilers, and consequently the unequal strains upon the flues
which tend so much to deteriorate steam boilers are obviated.
My Invention also consists in securing the flue or flues in which the
tubes are fixed by bolts and flanges to the shell of the boiler, and in
making the flues in sections or short lengths formed of cylinders with
flanges so as to be bolted together so that the flues or sections of flues
containing tubes can be readily removed for examination and can be
easily repaired or replaced when required.
I
My Invention also consists in combining partition plates with flues
having tubes arranged as above described to separate the ascending
from the descending currents, and thus promote a more rapid, regular,
and perfect circulation of the fluid in the boiler.
Fig. 1 is a longitudinal section; Fig. 2 is an end view; and Fig. 8 a
cross section of a boiler according to my Invention.
a is the shell of the boiler; b, the flue made up of short sections which
may be secured together by rivets or bolts passing through the flanges b¹
formed upon each section. The front end of the boiler may be secured
to the shell by bolts passing through the outer flanges a, and the end

page_text: remove
of the flue may be bolted to the back end of the boiler so that it will
only be necessary to unscrew the bolts at the front and back to.
the flue part of the boiler; c are the fire-bars; d, the bridge; ; those
sections of the flue which contain the tubes e, the lines e¹ representing
the centre of cach plane of tubes which are arranged as shown in
Fig. 3; fare partition plates (secured to the flanges b' of the flue or in
any other convenient manner) for separating the ascending from the
descending currents which will pass along the inside of the shell to
the lower side of the flue and ascend the tubes e on each side, the fluid
passing out from the tubes at the upper side of the flue.
I have now particularly described the nature of my said Invention
and the manner of carrying it into effect, and claim as my Invention,―
Firstly. The combination of diagonal water tubes in the horizontal
or inclined flues of steam boilers, substantially as herein-before described
and illustrated by the Drawings.
Secondly. The forming of the flues having diagonal water tubes in
sections or short lengths with flanges so as to be secured together or
separated with facility, substantially as herein-before described.
Thirdly. The combination of the partition plates (f) with diagonal
water tubes arranged in flues, substantially as herein-before described:
and illustrated by Fig. 3.
In witness whereof, I, the said Isaac Watt Boulton, have hereunto
set my hand and seal, this Twenty-seventh day of September,
in the year of our Lord One thousand eight hundred and seventy-