IMPROVEMENTS IN STEAM BOILERS AND IN THE FURNACES FOR HEATING THE SAME.
Year: 1873

page_text: LETTERS PATENT to Frank Atwood Huntington, of San Francisco,
State of California, in the United States of America, for the Inven-
tion of "IMPROVEMENTS IN STEAM BOILERS AND IN THE FURNACES FOR
HEATING THE SAME.
Sealed the 1st July 1873, and dated the 14th May 1873.
COMPLETE SPECIFICATION filed by the said Frank Atwood Huntington
at the Office of the Commissioners of Patents, with his Petition and
Declaration, on the 14th May 1873, pursuant to the 9th Section of
the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FRANK
ATWOOD HUNTINGTON, of San Francisco, State of California, in the
United States of America, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS IN
STEAM BOILERS AND IN THE FURNACES FOR HEATING THE SAME," and have
petitioned Her Majesty to grant unto me, my.executors, administrators,
and assigns, Her Royal Letters Patent for the same, and have made
solemn Declaration that I really believe myself to be the first and true
Inventor thereof.

page_text: To prevent undue pressure of any steam which may be generated in
the tank F, an outlet pipe f is applied to it which may risc vertically
through the horizontal wall b, or it may be conducted off in any other
desired manner and exhaust in the air. This tank F being arranged
below the fire flue and beneath the steam boiler A receives considerable
heat from the flames and products of combustion on their way from the
fire chamber to the boiler flues C, consequently the feed water will be
heated and considerable heat utilized before said water is pumped into the
boiler. The vertical side walls and the back wall of the furnace
chamber are hollow, as shown in Figs. 1 and 3, and extend above the
high water line of the boiler; these walls are composed of boiler plates
riveted together so as to safely withstand the greatest pressure which
will be allowed in the boiler A; said plates constitute the supporting
walls of the boiler in lieu of walls of masonry, and by means of the
horizontal diaphragm they inclose the space for the passage of the
products of combustion on their way from the fire chamber to the boiler
flues C. The front inclosing wall is single in this case, but it might be
double like the side and back walls, and the horizontal connection b
might be double although it is represented as single. Thus it will be
seen that the walls within which the steam boiler is placed afford a
water containing and steam generating space, the water in which is
heated by the influence of the direct heat as well as the heat given off
by the escaping products of combustion.
The steam which is generated between the walls inclosing the furnace
and lower flue chambers is allowed to enter the steam space above the
water in the boiler A through the arched pipes a, a, which spring from
the upper portion of the wall or jacket D, and enter the boiler on
opposite sides of the steam dome B.
The water space in the boiler A communicates with the chamber
between the walls D by means of a pipe c, shown clearly in Fig. 1, and
water is forced into the said chamber through a pipe c, shown in Figs. 2
and 3. If desirable the outer sides of the walls may be coated with felt
or other substance which is a poor conductor of heat, or if desirable the
side and back walls of masonry may be extended up so as to inclose said
walls and prevent a rapid radiation of heat therefrom. Fire is made on
the grate G, and the flames pass backward over the feed water heating
tank F; thence forward through the boiler flues C, C, and finally inay
escape into the stack at the front end of the boiler.

page_text: Figs. 4, 5, and 6 show a boiler made with two return flues C, and
having a fire space beneath the boiler; G is the fire-box, and H the
chimney or smoke stack, these parts not differing from other boilers of
this class. In this case double walls are made around the fire-box and
beneath the ash-pit, and these walls are extented along at each side of 5
the boiler and beneath the fire space, as shown at J, so that this space is
completely inclosed. These walls are suitably braced by stay bolts, and
passages I are made connecting the spaces with the main boiler, as
shown.
The tank K for supplying the boiler with water is arranged in this 1
mode of construction, partly over the fire space so that the feed water
will be partially heated before passing into the boiler.
Having thus described my Invention, what I claim and desire to
secure by Letters Patent is,-
First. In combination with the boiler A and connecting pipes a, c, 1
the vertical side and back walls D mounted on a hearth E, and con-
structed to form water containing and steam generating chambers, and
also as a means of support for said boiler, substantially as described.
Second. The feed water tank K forming the flue bed and bridge wall
beneath the boiler A in combination with the walls D of the boiler, 2
substantially as described.
Third. The boiler A, fire-box G, water space J, passages I, and
tank K, all constructed, combined, and arranged, substantially as
described and shown for the purpose set forth.
In witness whereof, I, the said Frank Atwood Huntington, have 2
hereunto set my hand and seal, this Sixteenth day of April,
in the year of our Lord A.D. One thousand eight hundred and
seventy-three.
Witnesses,
JOHN L. BOONE,
FRANK ATWOOD HUNTINGTON. (L.S.)
C. M. RICHARDSON.