IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS
Year: 1877

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane, in the
County of Middlesex, Patent Agent, for the Invention of "IMPROVEMENTS IN
THE CONSTRUCTION OF STEAM BOILERS." A communication from abroad by
Charles Vincent Lloyd, of Decorah, in the County of Winneshiek, State of
Iowa, United States of America.
Sealed the 8th May 1877, and dated the 9th January 1877.
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark at
the Office of the Commissioners of Patents on the 9th January 1877.
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middle-
sex, Patent Agent. "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS."
A communication from abroad by Charles Vincent Lloyd, of Decorah, in the
County of Winneshiek, State of Iowa, United States of America.
The object of this Invention is to improve the construction of steam boilers, as
hereafter more fully set forth.
According to this Invention the base of the boiler is constructed in any suitable
manner to contain the fire-box and ash-pit. On the interior of the base are suitable
lugs or flanges to support the boiler, which is made in sections, each section con-
sisting of a circular tube horizontally divided into halves, with two tubular arms
similarly divided crossing each other at right angles in the centre. The tube is
cast with hollow bosses at suitable intervals on top and bottom, and a central hollow
boss is also cast at top and bottom at the intersection of the arms. Each section
thus constructed is cast in two parts with suitable flanges to be bolted firmly
together. As many of these sections as may be desired are placed on top of each
other, the bosses corresponding as shown and long bolts passed through, and the
sections then fastened together by nuts on the ends of said bolts. By this construc-
tion each section forms four triangular openings for the passage of the products of
combustion, and in fastening the sections together they should be turned in such a
manner that the arms of each section should be directly over the spaces between
the tubes of the section immediately below. In adjusting the sections of the boiler
the centre collars act as turntables, upon which the sections can be turned properly.
By this construction of the sections I am able to cast an entire section without the
use of sand cores.

page_text: The feed water is to enter at the bottom, and the steam taken out at the top in
the usual manner. The boiler is surrounded by a wrought-iron jacket or shell sup-
ported upon the base and formed with a smoke outlet at the top. Between the
shell and every alternate section of the boiler is placed an annular plate to close the
space between them, and on the other sections are placed plates to close the spaces
between the arms. By this means it will be seen the products of combustion are
caused to take a zig-zag course, i.e., from the outside inward, and from the centre
outward, or in other words they first pass around the outside of the first section,
and meeting the annular plate around the second section they are deflected inward
and pass through the inside of the second section; then meeting the centre plates of
the third section they are deflected outward, and pass around the outside of said
third section, and so on to the top.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alexander Melville Clark in the Great Seal Patent Office on the
9th July 1877.
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middle-
sex, Patent Agent. "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS."
A communication from abroad by Charles Vincent Lloyd, of Decorah, in the
County of Winneshiek, State of Iowa, United States of America.
The object of this Invention is to improve the construction of steam boilers, as
will be herein-after more fully set forth.
Figure 1 of the annexed Drawings is a representation of a vertical central section*
of the steam boiler; and Figure 2 is a plan view thereof.
A represents the base of the boiler constructed in any suitable manner to contain
the fire-box and ash-pit. On the interior of the base A are suitable lugs or flanges
a, a, to support the boiler, which is made in sections, each section consisting of a
circular tube B horizontally divided into halves, with two tubular arms C, C,
similarly divided, crossing each other at right angles in the centre. The tube B is
cast with hollow bosses b, b, at suitable intervals on top and bottom, and a central
hollow boss d is also cast at top and bottom at the intersection of the arms C, C, as
shown. Each section thus constructed may be cast in two parts with suitable
flanges to be bolted firmly together or in one piece, as may be deemed best. As
many of these sections as may be desired are placed on top of each other, the bosses
corresponding, as shown, and long bolts h passed through, and the sections then
fastened together by nuts i on the ends of said bolts h, each of which is composed of
two pieces and a spiral spring of appropriate strength, which connects them together
(as seen on an enlarged scale Figure 3), and permits the escape of steam through
the joints of the sections when the pressure becomes too great. By this construction
each section forms four triangular openings for the passage of the products of com-
bustion, and in fastening the sections together they should be turned in such a
manner that the arms C of each section should be directly over the spaces between
the tubes of the section immediately below, as shown. In adjusting the sections of
the boiler the centre collars d act as turntables, upon which the sections can be
turned properly. By this construction of the sections B I am able to cast an entire
section without the use of sand cores.
The feed water is to enter at the bottom, and the steam taken out at the top
in the usual manner. The boiler is surrounded by a wrought-iron jacket or shell D,
supported upon the base A, and formed with a smoke outlet E at the top. Between
the shell D and every alternate section of the boiler is placed an annular plate m to
close the space between them, and on the other sections are placed plates n to close
the spaces between the arms C, as fully shown in Figure 1. By this means it will
be seen the products of combustion are caused to take a zig-zag course, i.e., from the

page_text: outsido inward, and from the centre outward, or in other words they first pass
around the outside of the first section, and meeting the annular plate m around the
second section they are deflected inward and pass through the inside of the second
section, then meeting the centre plates n of the third section they are deflected
outward, and pass around the outside of said third section, and on so to the top.
Having described the nature of the said Invention; and the manner of performing
the same, I declare that what I claim as the Invention to be protected by the herein-
before in part recited Letters Patent is, in a steam boiler the horizontal sections
consisting of circular tubes B cast in equal divisions, and tubular cross arms C
provided with hollow bosses b, d, bolts and springs h, and nuts i, in combination
with the surrounding shell D, annular deflecting plates m, and triangular deflecting
plates n, all constructed and arranged, substantially as and for the purpose set
forth.
In witness whereof, I, the said Alexander Melville Clark, have hereunto set
my hand and seal, this Ninth day of July, in the year of our Lord One
thousand eight hundred and seventy-seven.
A. M. CLARK. (L.S.)