Ax IMPROVED APPARATUS FOR GENERATING STEAM
Year: 1871

page_text: LETTERS PATENT to John Franklin Allen, of New York City, in the
.
State of New York, in the United States of America, for the In-
ation of 66 Ax IMPROVED APPARATUS FOR GENERATING STEAM."
COMPLETE SPECIFICATION filed by the said John Franklin Allen aţ
.
the Office of the Commissioners of Patents, with his Petition and
Declaration, on the 12th January 1871, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
FRANKLIN ALLEN, of New York City, in the State of New York, in the
United States of America, send greeting.
WHEREAS I am in possession of an Invention for "AN IMPROVED
APPARATUS FOR GENERATING STEAM," 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
am the first and true Inventor thereof.
NOW KNOW YE, that I, the said John Franklin Allen, do hereby declare
that the following Complete Specification, under my hand and seal, fully

page_text: describes and ascertains the nature of the said Invention, and in what
manner the same is to be performed, in and by the following
statement:-
:―
The nature of my Invention consists in arranging a number of tubes
or chambers horizontally side by side and attaching to the bottom of the
same a number of pipes inclined backwards at an inclination of about 20°.
Those pipes situated above or near the fire being made shorter than those
further away from the direct action of the heat and flame, by which
arrangement a perfect circulation in the pipes is obtained without any
additional loose tube or plate being placed in the inside of each pipe.
And further my Invention consists in the manner of connecting the
horizontal tubes with the steam drum as well as the lower ends of one
of the last rows of pipes with each other by means of nipples having
right and left handed threads cut on, by which arrangement the several
parts forming the steam generator are easily put together and connected
with each other.
"
In order that my Invention may be fully understood, I shall now
proceed more particularly to describe the same, and for that purpose
I shall refer to the several Figures on the Sheet of Drawings hereunto
annexed, forming a part of this Specification, and to the letters of
reference marked thereon.
Figure I. represents a longitudinal section of a boiler or steam
generator embodying my Invention; Figure II., is partly a cross section
and partly an end elevation of the same. Similar letters represent
similar parts.
My Invention consists in the arrangement of a series of oval or round
chambers or tubes A, running horizontally or nearly so the whole length
of the boiler, and placed side by side in any desired number. The after
ends of these tubes A rest on rollers a or other suitable supports attached
to the after or back brick wall Q to allow for the expansion of said tubes
while the forward ends of said tubes project partly into an opening d
made. in the front brick wall Y, and closed by a suitable plate n to give
easy access to the tubes for the purpose of cleaning the same. Above
these tubes A. and near their forward ends a drum B is arranged running
crosswise, to the bottom of which the several tubes A are attached by a
means of nipples m having right and left handed threads cut on. Small
plates are rivetted to the inside of the drum B for the purpose of
strengthening the same where the nipples enter. Into the lower parts

page_text: of the chambers or tubes A, pipes C are securely fastened inclining
backwards at about 20° inclination. These pipes C are welded circular
at the bottom and provided with a plug screwed into the ends for the
purpose of cleaning the same. These pipes may be staggered either with
those in each row of tubes or with those in the adjoining row to expose
the same as much as possible to the action of the flame and gases.
Above and near the fire or where most. exposed to the direct action
of the fire these pipes C .are made about four inches in diameter by
four feet in length or about in that proportion of area of tubes to the
surface exposed, and increase in length as the same are further away
from the direct effect of the fire. By this arrangement of giving the
tubes the above-mentioned inclination, and by making the same in the
specified proportions a perfect circulation will be obtained in these pipes
without the necessity of placing any internal tubes or loose plates into
the same for the purpose of creating the desired circulation. The last
row of the pipes C are connected together at their lower ends by means
of right and left handed nipples w screwed into suitable T's, fastened on
the ends of said pipes, whereby a connection of the different sections is
formed, the ends of said connection being connected through the
pipes v, v, with the bottom of the drum B whereby a perfect circulation
between the different sections forming the steam generator is obtained.
The pipes v, v, are provided with suitable cocks x, x, for the purpose
of using said pipes for feeding and for blowing off the boiler. On the
bottom of one of the after rows of the pipes C, provisions are made for
attaching the plate s, the forward end of which rests upon a projection
on the back of the bridge wall D; this plate s stops the downward
draft and supports the brick wall J, situated near the after end of the
boiler between two rows of pipes to cause the current of the draft to pass
upwards and over said brick wall J as indicated by the arrow.
By this
arrangement the gases before entering the chimney are caused to pass
over and around the last rows of the pipes C through which the cooler
feed water is made to enter the boiler thereby extracting the heat from
the escaping gases more effectively before entering the chimney by
bringing them in contact with surfaces cooled by the cooler feed
water. Some distance behind the bridge wall D a partition wall P
running from the top wall W some distance downwards is suspended
between two rows of pipes, regulating thereby the current of the flame
and gases in the desired direction. On the top of the drum B a steam
pipe H provided with the usual stop and safety valves is arranged. The
1

page_text: -
top wall W of the brickwork enclosing the boiler is laid close
upon the
horizontal tubes A with the exception of that part directly over the
fireplace X, where an arch V is thrown crosswise to the direction of
the tubes A enclosing the drum B for the purpose of drying the steam
in the said drum B. The pipes C are staggered either in each tube B or 5
between the adjoining tubes with each other to expose as much as
possible their surfaces to the direct action of the flame and gases and to
cause the flame and gases to pass around them.
Having now described and particularly ascertained the nature of my
said Invention and the manner in which the same is or may be used, I 1
would observe in conclusion that what I consider to be novel and original
and therefore claim as my Invention is,-
First. The arrangement and construction of a steam generator sub-
stantially in the manner and for the purpose herein-before set forth.
Secondly. The combination of horizontal tubes A with inclined pipes C, 1
substantially as and for the
described.
purpose
Thirdly. I claim increasing the length of the pipes C or making the
after pipes longer than those directly over the fire substantially in the
manner and for the purpose set forth.
Fourthly. I claim the manner of connecting the tubes A with the
drum B as well as the lower ends of the after row of the pipes C, with
cach other by means of right and left-handed threaded nipples sub-
stantially in the manner and for the purpose set forth.
Fifthly. I claim connecting the lower ends of the after row of the
pipes C with each other, and connecting the ends of this connection
with the drum B, substantially as and for the purpose herein-before set
forth.
In witness whereof, I, the said John Franklin Allen, have here-
.
unto set my hand and seal, this Twenty-seventh day of December,
One thousand eight hundred and seventy.
JOHN FRANKLIN ALLEN. (L.s.)