CERTAIN IMPROVEMENTS IN THE MANUFACTURE OF METAL TUBES FOR LOCOMOTIVE, MARINE, AND OTHER BOILERS
Year: 1850

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, we, GEORGE
ALLEN EVERITT, of the Firm of Allen Everitt and Son, of the Kingston
Metal Works, in the Borough of Birmingham, in the County of Warwick,
Metal and Tube Manufacturers, and GEORGE GLYDON, of Birmingham afore-
said, Engineer, and Foreman to the said "Allen Everitt and Son," send
greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Royal Letters Patent under the Great Seal of the United Kingdom of Great
Britain and Ireland, bearing date at Westminster, the Twelfth day of June
(One thousand eight hundred and fifty, in the thirteenth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto us, the said
George Allen Everitt and George Glydon, our exors, adñiors, and assigns,
Her especial licence, full power, sole privilege and authority, that we, the
said George Allen Everitt and George Glydon, our exors, adññors, and assigns,
or such others as we, the said George Allen Everitt and George Glydon, our
exors, adiñors, or assigns, should at any time agree with, and no others, from
time to time and at all times during the term of years therein mentioned,
should and lawfully might make, use, exercise, and vend, within England,
Wales, and the Town of Berwick-upon-Tweed, our Invention of "CERTAIN
IMPROVEMENTS IN THE MANUFACTURE OF METAL TUBES FOR LOCOMOTIVE, MARINE,
AND OTHER BOILERS;" in which said Letters Patent is contained a proviso that
we, the said George Allen Everitt and George Glydon, shall cause a particular
description of the nature of our said Invention, and in what manner the same
is to be performed, by an instrument in writing under our hands and seals,

page_text: or under the hand and seal of one of us, to be inrolled in Her Majesty's
High Court of Chancery within six calendar months next and immediately
after the date of the said in part recited Letters Patent, as in and by the
same, reference being thereunto had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, we, the said
George Allen Everitt and George Glydon, do hereby declare that the nature of
our said Invention, and the manner in which the same is to be performed,
are fully described and ascertained in and by the following statement thereof,
reference being had to the Drawing hereunto annexed, and to the figures and
letters marked thereon, that is to say:―
Whereas the metal tubes used for the flues of locomotive and other
boilers are more rapidly worn away at that end which is exposed to the
greatest heat than at the other end, and thereby rendered useless, while a
great portion of the tube is scarcely deteriorated or reduced in thickness;
and whereas there are practical difficulties in drawing tubes whose thickness
of metal is much greater at one end than at the other, we propose to add to
the durability of such metal tubes by increasing the thickness of the metal
or material at one end by inserting in the interior of such tubes a shield or
short tube of such length only as shall be necessary to protect them from
the great heat of the fire. To accomplish this we take a tube of brass, iron,
copper, or other suitable metal or alloy of metal, and we insert into the
interior thereof a short tube or shield of one or two feet in length or there-
abouts at the end which is required to be exposed to the most severe action
of the fire.
In Figure 1 of the Drawing hereunto annexed is shewn a longitudinal
section of one of our improved tubes; Figure 2 is a view of the end in which
the shield is placed; and Figure 3 is a view of the other end. A is the outer
tube, and B is the shield. This interior shield or tube we make by preference
of brass or iron, but it may be of copper or any other suitable metal or alloy
of metal. We draw the tubes together in the following manner :-Having
prepared a tube of the whole length required in the ordinary way, we take
the shield and place it upon a steel mandril necked or turned at one end to
the length of the shield or rather more, as shown in Figure 4; we then proceed
to put the other tube upon the mandril covering the shield or inner tube, and
draw them upon the mandril through a die upon a draw bench in the ordinary
manner of drawing tubes, and we afterwards withdraw the mandril, which is
tapered to facilitate its withdrawal. Or the exterior tube may be prepared
and finished with the required taper upon a mandril or otherwise; or it may be
parallel and the shield or inner tube may also be prepared upon a separate

page_text: mandril, making this tube also taper in the interior, if required, and finishing
it so as to fit tightly within the outer tube, into which we drive it by power or
otherwise. This inner shield or tube will answer the purpose of a ferrule, and
can be used as such or with the ordinary ferrules now in use. The length
of the shield may be varied according to circumstances and according to the
relative intensity of the heat at each end of the tube; but the length of the
shield must in no case be less than twice its diameter, and it must always be
much shorter than the external tube.
Having now described the nature of our Invention, and the manner in
which the same is to be performed, we wish it to be understood that we do
not claim the introduction of a short tube into the ends of the metal tubes
of boilers when the length of such short tube is less than twice its diameter,
nor do we claim the lining the whole length of a tube with another tube; but
what we claim as our Invention of Certain Improvements in the Manufacture
of Metal Tubes for Locomotive, Marine, and other Boilers, is, the application
in one end of such tubes of a shield or short tube whose length exceeds twice
its diameter, but is less than half the length of of the tube into which it is
introduced, as above described.
In witness whereof, we, the said George Allen Everitt and George Glydon,
have hereunto set our hands and seals, this Eleventh day of December,
in the year of our Lord One thousand eight hundred and fifty.
GEORGE ALLEN EVERITT. (L.S.)
GEORGE GLYDON. (L.S.)
AND BE IT REMEMBERED, that on the Eleventh day of December, in the
5 year of our Lord 1850, the aforesaid George Allen Everitt and George Glydon
came before our said Lady the Queen in Her Chancery, and acknowledged
the Specification aforesaid, and all and every thing therein contained and
specified, in form above written. And also the Specification aforesaid was
stamped according to the tenor of the Statute made for that purpose.
Enrolled the Twelfth day of December, in the year of our Lord One
thousand eight hundred and fifty.