IMPROVEMENTS IN THE MODE OR APPLYING FUSIBLE PLUGS TO STEAM BOLLERS
Year: 1855

page_text: LETTERS PATENT to Thomas Fielden Uttley, of Mytholm Royd, in the
County of York, Manager, for the Invention of "IMPROVEMENTS IN THE
MODE OR APPLYING FUSIBLE PLUGS TO STEAM BOLLERS."
Sealed the 17th June 1856, and dated. the 28th December 1855.
PROVISIONAL SPECIFICATION left by the said Thomas Fielden Uttley
at the Office of the Commissioners of Patents, with his Petition, on
the 28th December 1855.
I, THOMAS FIELDEN UTTLEY, of Mytholm Royd, in the County of York,
Manager, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN THE MODE OF APPLYING FUSIBLE PLUGS TO STEAM BOILERS" to be as
follows:-
My Invention consists in applying the fusible plug in the lower extremity of
a tube, part of which projects into the space above the fire or into the flue,
and the other part ascends into the boiler. By this means, when the level of
the water in the boiler descends below the upper part of the tube, the water'
in the tube is evaporated before the level of the water descends sufficiently to
leave the boiler plates uncovered; consequently, the fusible plug is melted, and
the signal given before any injury is done to the plates of the boiler or flue.

page_text: Also, in securing the fusible plug to the tube in. which it is fixed, in such wise
that the lower part of the plug shall approach, as near as possible the lower
part of the plate to which it is connected..
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Thomas Fielden Uttley in the Great Seal Patent Office on
the 26th June 1856.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
FIELDEN UTTLEY, of Mytholm Royd, in the County of York, Manager, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-eighth day of December, in the year of our
Lord One thousand eight hundred and fifty-five, in the nineteenth year of
Her reign, lid, for Herself, Her heirs and successors, give and grant unto
me, the said Thomas Fielden Uttley, Her special license that I, the said
Thomas Fielden Uttley, my executors, administrators, and assigns, or such
others as I, the said Thomas Fielden Uttley, my executors, administrators,
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 In-
vention for "IMPROVEMENTS IN THE MODE OF APPLYING FUSIBLE PLUGS TO STEAM
BOILERS," upon the condition (amongst others) that I, the said Thomas
Fielden Uttley, my executors or administrators, by an instrument in writing
under my, 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 Thomas Filden Uttley, 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 (that is to say) :-
The nature of my Invention consists in applying the fusible plug in the
lower extremity of a tube, part of which tube projects into the space above the

page_text: fire or into the flue; and the other part ascends into the boiler. By this means,
when the level of the water in the boiler descends below the level of the upper
part of the tube, the water in the tube is evaporated before the level of the
water in the boiler descends sufficiently to leave the boiler plates uncovered;
consequently, the fusible plug is melted, and the signal given before any injury
is done to the plates of the boiler or flue. Also, in securing the fusible plug
to the tube in which it is fixed, in such wise that the lower part of the plug
shall approach or descend below the lower part of the plate to which it is
connected.
And in order that my Invention may be fully understood and readily carried
into effect, I will proceed to describe the means pursued by me, reference
being had to the accompanying Drawing, and to the letters marked thereon.
Figure 1 is an elevation, in section, of my improvements; and Figure 2,
a plan view.
a represents the plate of a boiler flue or fire box, to which is rivetted or
otherwise connected the flange 6 of the tube c, the lower end of which has an
opening d, which is closed by the fusible plug e; this plug is held down by the
lower end of the tube f, the upper end of which has a flange, which is secured
to the flange g of the tube c by screw bolts h, h. The level of the lower part
of the fusible plug e is brought to the same level as the lower part of the plate a,
or somewhat below it, as shewn in Figure 1, in order that the heated air and
gases in the flue or fire box may act effectually on the fusible plug. The line i
represents the level of the water in the boiler when the boiler contains a
sufficient supply; and as the upper part of the tube c is open, it is evident that
the water fills the tube c, and entering the holes in the tube f, covers the upper
part of the fusible plug e. As long as the water remains at its proper level in
the boiler the plug e remains uninjured by the action of the heated air and
gases in the flue or fire box, as in other modes of applying fusible plugs; but
as soon as the level of the water descends below the level of the upper part of
the flange g, the water contained in the tube c begins to evaporate, and becomes
entirely evaporated before the level of the water in the boiler is sufficiently
lowered to leave the plates of the flue or fire box uncovered. Immediately
after the water in the tube c has been evaporated, the fusible plug e is melted
by the action of the heated air and gases, and the steam from the boiler rushes
through the opening d before any injury is done to the plates of the boiler.
Having thus described the nature of my Invention, and the manner of
performing the same, I wish it to be understood that I do not limit myself to
the particulars set forth, as the same may be varied; but what I claim is, the

page_text: improvements in the mode of applying fusible plugs to steam boilers, whereby
a portion of water in the boiler is retained above. the plug and allowed to:
evaporate, so as to leave the plug uncovered before the level of the water!
descends sufficiently to leave uncovered the plates of the boiler.
In: witness whereof, I, the said' Thomas Fielden Uttley, have hereunto
set my hand and seal, this Twenty-fourth day of June, in the year of
our Lord One thousand eight hundred and fifty-six.
-Witness,
H. B. BARLOW,
Manchester.
THOS F. UTTLEY. (L.8.)