IMPROVEMENTS IN APPARATUS FOR SUPERHEATING IN TUBES AND TUBULAR ARTICLES, AND IN MACHINERY FOR THE MANUFACTURE THEREOF
Year: 1862

page_text: LETTERS PATENT to George Thomas Selby. of Smethwick, in the County
...of Stafford, Tube Manufacturer, for the Invention of "IMPROVEMENTS IN
APPARATUS FOR SUPERHEATING IN TUBES AND TUBULAR ARTICLES, AND IN
MACHINERY FOR THE MANUFACTURE THEREOF."
Sealed the 13th January 1863, and dated the 16th July 1862.
PROVISIONAL SPECIFICATION left by the said George Thomas Selby at
The Office of the Commissioners of Patents, with his Petition, on the
16th July 1862.
1, GEORGE THOMAS SELBY, of Smethwick, in the County of Stafford, Tube
Manufacturer, do hereby declare the nature of the said Invention for
IMPROVEMENTS IN APPARATUS FOR SUPERHEATING IN TUBES AND TUBULAR
ARTICLES. AND IN MACHINERY FOR THE MANUFACTURE THEREOF," to be
follows:-
as
I construct superheaters of one or many tubes of a worm or spiral form,
through which the steam or gas to be superheated passes; heat from the
furnace is outside round about them, and they may be placed in the funnel,
stack, fire or smoke box of a steam boiler, or in any convenient part of a
furnace, or in a furnace made for their reception. The tubes being spiral,
expansion and contraction in the length of the tube is accommodated without
affecting the joint or connection to the part where the tube is fixed. When
ID 3

page_text: many or a series of spiral tubes are required, I make the connections between
them of tubes made for the purpose with thickness of metal on that part
where the joint is made. This thickness is of greater substance than the other
parts, so that the joints may be effectually made either by the ends of the
spiral tubes being screwed in or otherwise fixed. A similar extra thickness
may be formed on the opposite part, in order that the whole may expand and
contract more uniformly.
This kind of tube is particularly useful in the construction of surface con-
densers, it being only necessary to provide a suitable thickness of metal at the
part the joints and connections are made, the other parts of the tube being
considerably thinner. These thick side tubes or tubular articles are useful for
many other purposes. particularly for bridge and roof girders, and for pillars.
The machinery by which these tubes are made is somewhat similar to that
which is used for making and welding iron tubes, but the dies used at the
draw bench for bringing the edges of the piece of metal together preparatory
to welding them are shaped so as to allow the projections or thicker part of
the metal strip or sheet to pass through when the desired form has been
given to the thickness of the piece of metal in the usual way by grooves
formed in the rolls of the rolling mill. When, however, the extra thickness is
given, as herein-after described, the tube or tubular article is prepared and
welded in the usual way. When the tube is thus prepared it is placed in a
furnace and brought to a welding heat, and then passed through rolls to weld
the edges together. The inside should be supported by a mandril, such as
is used for welding iron tubes, and the rolls may be a set of two, three, or four,
similarly constructed to those now used for welding iron tubes, with this
difference, that on one roll or on all the rolls, or on opposite rolls, a groove is
made to correspond with the shape and thickness desired to be given to the
outside of the tube or tubular article, and the mandril must be shaped to give
the desired internal form and thickness to the tube or tubular article; but 1
prefer to give the desired extra thickness by partially fixing externally or inter-
nally, or both, either by welding at the ends or by rivetting a flat or suitably-
shaped piece of iron on an ordinary tube, and then passing the whole at a
welding heat through grooved rolls, as above described, so as to weld the
whole length of the piece or pieces of metal on to the tube.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said George Thomas Selby in the Great Seal Patent Office on the
16th January 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I. GEORGE
THOMAS SELBY, of Smethwick, in the County of Stafford, Tube Manufacturer,
send greeting.
WHEREAS Iler most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Sixteenth day of July, in the year of our Lord One
thousand eight hundred and sixty-two. in the twenty-sixth year of Her reign.
did, for Herself. Her heirs and successors, give and grant unto me. the said
George Thomas Selby. Her special licence that I, the said George Thomas
Selby, my executors, administrators, and assigns, or such others as I, the said
George Thomas Selby, 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 "IMPROVE.
MENTS IN APPARATUS FOR SUPERHEATING IN TUBES AND TUBULAR ARTICLES. AND IN
MACHINERY FOR THE MANUFACTURE THEREOF," upon the condition (amongst
others) that I. the said George Thomas Selby, 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 George Thomas Selby, 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 thereof, reference being had to the Drawings hereunto annexed,
that is to say:-
I construct superheaters of one or many tubes of a worm or spiral form,
through which the steam or gas to be superheated passes; heat from the
furnace is outside round about them. They may be placed in the funnel,
stack. fire or smoke box of a steam boiler, or in any convenient part of a
furnace, or in a furnace made for their reception. The tubes being spiral,
expansion and contraction in the length of the tube are accommodated without
affecting the joint or connection to the part where the tube is fixed. Wlien
many or a series of spiral tubes are required, I make the connections between

page_text: them of tubes formed for the purpose with thicknesses of metal of that part
where the joint is made. This thickness is of greater substance than the other
parts, so that the joints may be effectually made either by the ends of the
spiral tubes being screwed in or otherwise. A similar extra thickness may be
formed on the opposite part, in order that the whole may expand and contract
more uniformly.
This kind of tube is particularly useful in the construction of surface con-
dlensers, it being only necessary to provide a suitable thickness of metal at
those parts where the joints and connections are made. the other parts of the
tube being thinner. These thick-sided tubes or tubular articles are useful for
many other purposes; particularly for bridge and roof girders, and for pillars.
The machinery by which these tubes are made is somewhat similar to that
which is used for making and welding iron iubes, but the dies used at the
draw bench for bringing the edges of the piece of metal together preparatory
to welding them are shaped so as to allow the projections or thicker part of
the metal strip or sheet to pass through when the desired form has been given
to the thickness of the piece of metal in the usual way, by grooves formed in
the rolls of the rolling mill. When, however, the extra thickness is given, as
herein-after described, the tube or tubular article is prepared and welded in
the usual way. When the tube is thus prepared it is placed in a furnace and
brought to a welding heat, and then passed through rolls to weld the edges
together. The inside should be supported by a mandril, such as is used for
welding iron tubes, and the rolls may be a set of 2, 3, or 4. similarly con-
structed to those now used for welding iron tubes. with this difference, that
on one roll or on all the rolls, or on opposite rolls, a groove is made to corre-
spond with the shape and thickness desired to be given to the outside of the
tube or tubular article. and the mandril must be shaped to give the desired
internal form and thickness to the tube or tubular article: but I prefer to
give the desired extra thickness by partially fixing externally or internally, or
both, either by welding at the ends, or by rivetting a flat or suitably-shaped
piece of iron on an ordinary tube, and then passing the whole at a welding
heat through grooved rolls, as above described, so as to weld the whole length
of the piece or pieces of metal on to the tube.
Figure 1 is an elevation of a spiral tube, through which steam may be made
to pass in order to superheat it Figure 2 is an elevation. partly in section, of a
superheating apparatus formed of several spiral tubes united at top and bottom
to tubes thickened at those parts where the joints are to be effected.
A, A, are the spiral tubes threaded at both ends; A' is a tube for leading
the steam to be superheated; and A is a tube for receiving and conveying the

page_text: steam after being superheated: these tubes are thickened at B.
thickened at B. C, C, are
nipples screwed into the thickened part of the tubes A' and A2: only one of these
nipples is shewn in the Drawings, but the connections for all the spiral tubes
are alike, and at both ends d, d, are collars screwing on to the nipples C, C,
and on to the threads on the ends of the spiral tubes A. A: e, c, are nuts
screwing against the collars. Figures 3, 4, and 5. are transverse sections of
tubes thickened at B. The thickened portions may extend the entire length of
the tubes, or they may be thickened at intervals only. Figures 6. 7. and 8 are
transverse sections of tubular articles thickened throughout or at intervals, and
suitable for girders, pillars, and other like articles. Figure 9 is an end view
of a pair of rolls suitable for rolling and welding a thickened tube of the form
shown in the transverse section, Figure 3. After the tube has been formed
and thickened, as herein-before described. it is brought to a welding heat and
subjected to the action of the roll in the usual manner of welding tubes.
Instead of two rolls three or more may be used, the grooves being made to
correspond with the form of the thickened tube or tubular article.
And having now described the nature of my said Invention, and in what
manner the same is to be performed, I declare that I claim,-
First, constructing apparatus for superheating of one or more tubes of a
spiral or worm form, as herein-before described.
Second, constructing apparatus for superheating of several spiral tubes
united at both ends to thickened tubes, substantially in manner herein-before
described.
Third, constructing tubes and tubular articles thickened in manner and for
the purposes herein-before described.
And, fourth, the machinery, herein-before described. for manufacturing the
thickened tubes and tubular articles.
In witness whereof, I, the said George Thomas Selby. have hereunto
set my hand and seal, this Fourteenth day of January, One thousand
eight hundred and sixty-three.
GEO. THOS. SELBY. (L.S.)