IMPROVE- MENTS IN APPARATUS FOR KEGULATING THE SUPPLY OF AIR TO FURNACES
Year: 1874

page_text: LETTERS PATENT to Thomas Symes Prideaux, of 4, Granville Place,
Blackheath, in the County of Kent, for the Invention of "IMPROVE-
MENTS IN APPARATUS FOR KEGULATING THE SUPPLY OF AIR TO FURNACES.
PROVISIONAL SPECIFICATION left by the said Thomas Symes Prideaux
at the Office of the Commissioners of Patents, with his Petition,
on the 24th December 1874.
I, THOMAS SYMES PRIDEAUX, of No. 4, Granville Place, Blackheath,
in the County of Kent, do hereby declare the nature of the said In-
vention for "IMPROVEMENTS IN APPARATUS FOR REGULATING THE SUPPLY OF AIR
TO FURNACES," to be as follows:-
:-
The object of this Invention is to effect certain improvements in the
apparatus for regulating the supply of air to furnaces Patented by me
on the 11th of August 1870, No. 2227, and in the improvement on the
said apparatus Patented by me on the 24th of December 1872, No. 3898.
These improvements consist,-

page_text: lifting the air chamber lid simultaneously with the opening of the
furnace door, as shown in the Patent of 1872; this consisted of a bar
having a short projecting arm at the top traversing on the external faco
of the air chamber, to which it was secured by a collar, the bottom of
the bar resting upon a helix formed by cutting away a portion of the
circumference of the hinge from its top. The opening of the furnace
door raised the bar, the projecting arm of which lifted the lid of the air
chamber; the closing of the furnace door withdrew the upper part of the
inclined plane from beneath the bar; leaving it to desend by the force of
its own gravity.
The construction and action of the mechanism substituted for the
above is as follows:-A bar traversing vertically is affixed by two sockets
to the inner face of the front of the lateral air chamber opposite the
hinge. Two studs forged on the lower portion of this bar project
through a slot cut for this purpose in the front of the air chamber, which
slot is of a sufficient length to allow the travel of the studs through a
distance equal to the height of the inclined plane of the section of a
helix placed upon and exterior to the circumference of the hinge. The
thread of the helix fits into the space between the studs, and when the
furnace door is closed the upper end of the lifting bar just touches the
under surface of the air chamber lid when shut. Upon the opening of
the furnace door the upper face of the thread of the helix raises the
lifting bar which lifts the superincumbent lid of the air chamber, and
upon closing the furnace door the lower face of the thread of the helix
brings down the lifting bar to its original position, and the lid of the air
chamber disengaged from its support drops till it finds its position of
equilibrium and the air valve is in action & commences its slow and
measured descent:
2nd. Of an addition to the motor regulator to prevent the access of
dust or steam to the interior. This object is attained by afflixing the
wider end of a conical sack (corrugated horizontally) to a rim made for
the purpose on the bottom of the cylinder, whilst the narrower end is
attached to the bottom of the piston rod, which thus traverses within it,
the sack folding & unfolding at the corrugations as tho piston rod
rises and falls. The sack may be made of leather blocked into form, or;
of woven fibrous material coated with a preparation of india-rubber.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Symes Prideaux, in the Great Seal Patent
Office on the 23rd June 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
SYMES PRIDEAUX, of 4, Granville Place, Blackheath, in the County of
Kent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fourth day of December, in the
year of our Lord One thousand eight hundred and seventy-four, in the
thirty-eighth year of Her reign, did, for Herself, Her heirs and succes-
sors, give and grant unto me, the said Thomas Symes Prideaux, Her
special licence that I, the said Thomas Symes Prideaux, my executors,
administrators, and assigns, or such others as I, the said Thomas Symes
Prideaux, 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 Invention for
“IMPROVEMENTS IN APPARATUS FOR REGULATING THE SUPPLY OF AIR TO FURNACES,"
upon the condition (amongst others) that I, the said Thomas Symes
Prideaux, 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 Scal 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 Symes Prideaux, do hereby
declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained in
and by the following statement :-
-
The object of this Invention is to effect certain improvements in the
apparatus for regulating the supply of air to furnaces Patented by mo
on the 11th of August 1870, No. 2227, and in the improvement on the
said apparatus Patented by me on the 24th of December 1872, No. 3898.
These improvements consists.—