CERTAIN IMPROVEMENTS IN MACHINERY OR APPARATUS APPLICABLE TO THE FURNACES OR FIRE- PLACES OF STEAM ENGINES OR OTHER BOILERS
Year: 1846

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
MURGATROYD DEAN, of Stockport, in the County of Chester, Engineer, send
greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Twenty-fifth day of February, in the ninth year of Her reign,
and in the year of our Lord One thousand eight hundred and forty-six, did, for
Herself, Her heirs and successors, give and grant unto me, the said Thomas
Murgatroyd Dean, Her especial license, full power, sole privilege and authority,
that I, the said Thomas Murgatroyd Dean, my executors, administrators, and
assigns, and such others as I, the said Thomas Murgatroyd Dean, my executors,
administrators, or assigns, should at any time agree with, and no others, from
time to time and at all times during the term of years therein expressed,
should and lawfully might make, use, exercise, and vend, within England
and Wales, and the Town of Berwick-upon-Tweed, my Invention of "CERTAIN
IMPROVEMENTS IN MACHINERY OR APPARATUS APPLICABLE TO THE FURNACES OR FIRE-
PLACES OF STEAM ENGINES OR OTHER BOILERS;" in which said Letters Patent is
contained a proviso, that I, the said Thomas Murgatroyd Dean, shall cause
a particular description of the nature of my said Invention, and in what
manner the same is to be performed, to be inrolled in Her Majesty's High
Court of Chancery within six calendar months next and immediately after
the date of the said in part recited Letters Patent, as in and by the same,
reference being thereunto had, will more fully and at large appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
Thomas Murgatroyd Dean, do hereby declare that the nature of the said Inven-
tion, and the manner in which the same is to be performed, is particularly
described and ascertained in and by the Drawings hereto annexed, and the
following explanation thereof, that is to say:-
My improvements in machinery or apparatus applicable to the furnaces
or fire-places of steam engine or other boilers, have for their object a more
perfect consumption of the smoke and other combustible vapours, and con-
sequent economy of fuel; and consist, firstly, in a double, self-acting feeding
apparatus, one side of which is caused to supply the furnace with fuel, whilst
the other is at rest, and vice versa, alternately; and secondly, in placing a
partition wall in the furnace between the fire doors and the bridge of the
same, and employing two dampers at or about the bridge, which are opened
and closed alternately by certain levers and rods connected with the feeding
apparatus.
And in order more clearly to illustrate the practical application of my
Invention, I have attached to these Presents a Sheet of Drawings, shewing my
Invention as applied to the furnace of an ordinary cylindrical boiler, the same
being drawn to a scale of about half an inch to the foot, and having similar
letters of reference placed upon corresponding parts of the apparatus in all
the Figures.
Figure 1 is an end view of a steam boiler and furnace with my improvements
applied thereto; Figure 2 is a transverse section, taken in front of the bridge
of the furnace; and Figure 3 is a horizontal section, taken below the boiler.
a, a, is the foundation brickwork supporting the boiler b, b; c, c, is the "dead
plate" of the furnace; and d, d, are the fire bars; e is the main driving shaft,
to which motion is communicated by a strap passing around the pulley e' at its
upper end, or by any other convenient means. Upon the main driving shaft
e is a pulley f, which, by means of the cross straps g and h, drives the shaft i
of the right-hand feeding apparatus, and the shaft j of the left-hand feeding
apparatus alternately; the shafts i and j have each a fast and a loose pulley
at their upper end, and the requisite shifting of the straps from the fast on to
the loose pulleys is effected in the following manner:-A small crank k is
'caused to revolve by means of a worm on the driving shaft e, actuating the
worm gearing ; this crank k has a lever attached to it, furnished with the
two studs m and n, which as the crank revolves causes the strap lever o to
vibrate, throwing one strap on to the loose pulley and the other on to the
fast one, thus alternately setting in motion and stopping each feeding appa-
ratus. It will be seen in Figures 2 and 3 that there is a partition wall p in

page_text: the furnace, reaching from the fire bars to the bottom of the boiler, and
extending from the bridge about half way to the fire doors, and that there
are two dampers 9 and behind the bridge of the same, one of which
is open and the other closed. These dampers are connected to the strap
by cranks and levers, so that when one side of the feeding appa-
ratus is supplying fuel to the fire, the damper upon that side is closed,
and the damper upon the opposite side is open, and vice versa. In the
Drawing the right-hand feeding apparatus is represented at work, and that
upon the left hand stationary; so the right-hand damper being closed, the
smoke, &c. from the fresh coal will have to pass round the partition wall p,
and over the fire upon the left hand of the furnace, and will thereby be con-
sumed; of course it will be evident that when the motion of the feeding
apparatus and dampers is reversed by the revolution of the crank k, the
passage of the smoke, &c. will be reversed also.
In witness whereof, I, the said Thomas Murgatroyd Dean, have hercunto
set my hand and seal, this Twenty-fourth day of August, One thousand
eight hundred and forty-six.
August, in the year above mentioned, the aforesaid Thomas Murgatroyd
Dean came before our Lady the Queen in Her Chancery, and acknowledged
the Specification aforesaid, and all and everything therein contained, in form
above written. And also the Specification aforesaid was stamped according to
the tenor of the Statute in that case made and provided.