IMPROVEMENTS IN STEAM BOILERS."
Year: 1855

page_text: LETTERS PATENT to Daniel Dunn, Chocolate Manufacturer, of 9, King's
Row, Pentonville, in the County of Middlesex, for the Invention of
"IMPROVEMENTS IN STEAM BOILERS."'
Sealed the 27th July 1855, and dated the 29th May 1855.
PROVISIONAL SPECIFICATION left by the said Daniel Dunn at the
Office of the Commissioners of Patents, with his Petition, on the 29th
May 1855.
I, DANIEL DUNN, Chocolate Manufacturer, of No. 9, King's Row, Penton-
ville, in the County of Middlesex, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN STEAM BOLLERS" to be as follows:-
My improvements consist in constructing steam boilers in such a way that
they may be made gradually to revolve on axis, very much after the fashion of
a coffee-roasting machine, so that a fresh surface of the boiler may become
constantly exposed to the action of the fire, instead of allowing the latter to act
always on the same surface, as is usually the case with ordinary boilers. Onc
of the ways by which I contemplate accomplishing this, and supposing an
ordinary cylindrical boiler to be chosen for the purpose, is as follows:-I bolt,
rivet, or otherwise fasten at each of its ends an axle of a suitable length, sup-
ported on bearings in the usual way. One of these axles may be of solid irou,.

page_text: but I prefer it to be hollow, and provided with a stuffing box, through which a
water pipe passes, in order to feed the boiler with water; and it is also on this
water pipe that I prefer placing a water guage or try cocks, to indicate the
level of the water in the boiler. To this hollow axle, provided with a stuffing
box, as just said, I fasten a cog wheel, into the cogs of which an endless screw
or a spur wheel is made to work, or else a pulley with a chain, by means of
which a slow revolving motion is imparted to the boiler. The various means
by which such a revolving may be accomplished being well known to engineers,
need not be described here. The other axle, fastened at the other end of the
boiler, should be hollow, and through this hollow axle, and through the stuffing
box, with which it is provided, a steam pipe passes, which is bent upwards, and
always remains so inside of the boiler; and it is by means of this steam pipe,
which is provided with a steam cock at a suitable distance from the boiler
that the steam generated in the latter finds an exit when wanted. The
boiler is therefore revolving on two projecting ends or axles at each extremity,
one of which axles serves to support one end of the boiler, and it is to that
axle that I prefer attaching the cog wheel or other apparatus by which the
boiler is made to revolve; the other axle supports the other end of the boiler,
and revolves round the horizontal portion of the pipe, by means of which the
steam may be withdrawn from the boiler, and it is on this steam pipe and at a
convenient distance from the boiler that I place the safety valve.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Daniel Dunn in the Great Seal Patent Office on the 6th
August 1855.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, DANIEL
DUNN, of 9, King's Row, Pentonville, in the County of Middlesex, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-ninth day of May, in the year of our Lord
One thousand eight hundred and fifty-five, in the eighteenth year of Her
reigu, did, for Herself, Her heirs and successors, give and grant unto me, the
said Daniel Dunn, Her special licence that I, the said Daniel Dunn, my
executors, administrators, and assigns, or such others as I, the said Daniel
Dunn, my executors, administrators, and assigns, should at any time agree

page_text: 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 STEAM BOILERS,"
upon the condition (amongst others) that I, the said Daniel Dunn, by an
instrument in writing under my hand and seal, 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 Daniel Dunn, do hereby declare the
nature of my 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:
My improvements consist in constructing steam boilers in such a way that
they may gradually revolve on an axis, very much after the fashion of a coffee-
roasting machine, so that a fresh surface of the boiler may be constantly
exposed to the action of the fire, instead of allowing the latter to act always on
the same surface, as is usually the case. One of the ways of accomplishing this,
and supposing an ordinary cylindrical boiler to be chosen for the purpose, I
bolt, rivet, or otherwise fasten at each of its ends an axis of a suitable length,
supported on bearings in the usual way. One of these axes may be of solid iron,
but I prefer it to be hollow, and provided with a stuffing box, through which a
water pipe passes, in order to feed the boiler with water; and it is also on this
axis that I prefer placing a water guage, to indicate the level of the water in
the boiler. To this I fasten a cog wheel, into the cogs of which an endless screw
or spur wheel is working, or else a pulley with a chain, by means of which a
slow revolving motion is imparted to the boiler. The various means by which
such a revolving may be accomplished being well known to engineers, need.
not be described here. The other axis, fastened at the other end of the boiler,
should be hollow, and through this hollow axis and through a stuffing box with
which it is provided a steam pipe passes, which is bent upwards, and always
remains so inside the boiler; and it is by means of this steam pipe, which is
provided with a steam cock placed at a suitable distance, that the steam gene-
rated in the boiler finds an exit when wanted. The boiler is therefore revolving
on two projecting ends or axis, one of which serves to support one end of the
boiler, and it is to this end that I prefer attaching the cog wheel or other-
apparatus by which the boiler is made to revolve; the other end is, as I said,

page_text: hollow, and revolves upon the horizontal portion of the pipe, by means of
which the steam may be withdrawn from the boiler when wanted.
It is also
on this pipe, and at a convenient distance from the boiler, that I place the
safety valve.
In witness whereof, I have hereunto set my hand and seal, this Third
day of August, in the year of our Lord One thousand eight hundred
and fifty-five.
Signed, sealed, and delivered in the
presence of
THO CHALMERS.
DANIEL DUNN. (L.B.)