IMPROVEMENTS IN BOILERS APPLICABLE TO LOCOMOTIVE AND OTHER ENGINES
Year: 1839

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THEOBALD
WAHL, of George Yard, Lombard Street, in the City of London, Engineer,
send greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Second day of November, in the third year of Her reign, did, for
1
Herself, Her heirs and successors, give and grant unto me, the said
Theobald Wahl, Her especial licence, full power, sole privilege and authority,
that I, the said Theobald Wabl, my exors, adiñiors, and assigns, or such
others as I, the said Theobald Wahl, my exors, admiors, 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 expressed, should and lawfully might make,
use, exercise, and vend, within England, Wales, and the Town of Berwick-
upon-Tweed, my Invention of "IMPROVEMENTS IN BOILERS APPLICABLE TO
LOCOMOTIVE AND OTHER ENGINES;" in which said Letters Patent is contained a
proviso that I, the said Theobald Wahl, shall cause a particular description of
the nature of my said Invention, and in what manner the same is to be per-
formed, to be inrolled in Her said 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.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
Theobald Wahl, do hereby declare the nature of my said Invention, and the
manner in which the same is to be performed, are particularly described and
ascertained in and by the following description thereof, reference being had to
the Drawing hereunto annexed, and to the figures and letters marked thereon,
that is to say-
My improvements consist in a mode of fixing the tubes of that description
of boiler called tubular boilers, which are used for locomotive engines and for
other purposes, whereby I am enabled to obtain the expansion or contraction
of the tubes required, and in such manner as more completely to prevent their
being displaced; and this is effected by placing at-the-ends of--the tubes what
may be called split rings, which rings will be of various forms and sizes,
according to the dimensions of the tubes to which they are applied.
According to this Invention the ring which enters the end of the tube is slit,
and when within the tube the ring is expanded-by a wedge or key, as hereafter
explained; and it is preferred that the ring should be grooved on the external
surface. In case of its being required to take off one of the rings the wedgo
or key is withdrawn and the collar becomes free; it may be then be withdrawn
without any difficulty.
DESCRIPTION OF THE DRAWING.
a represents a section of the boiler plate; «, one of the tubes which
fits in the opening formed in the plate, and it will be seen that the tube is
bent at the end as shown at a'. w is a split ring, which is placed in the inner
part of the tube a, in order to close or fix it in the plate a. The nature of the
ring and the opening to receive the wedge will readily be understood by
examing the Drawing. The wedge y fits into the inner part or slit c, and
closes it to the part d, and when well pushed in by a rod or other means, it is
cut off and rivetted at d. o represents the groove or recess around the ring w.
I would remark, that although I have shown the ring w to receive the wedge
or key from the inside of the tube, it will be evident that it may be suitably
formed by reversing the opening of the slit in the ring, and thus allow of
the wedge being forced inwards; and in such cases it does not require to be
rivetted.
From the foregoing description it will be seen that the tube a will be caused
to lap over the edges of the opening in the boiler plate, and thus more com-
pletely prevent the possibility of movement or loosening of the tube a, and the
same will be rendered more water and steam tight at its points of junction with
the boiler plate through which it passes; and I would have it understood that