AN IMPROVEMENT OR IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS
Year: 1854

page_text: LETTERS PATENT to Alfred Sohier Bolton, of Birmingham, in the County
of Warwick, Manufacturer, and Francis Seddon Bolton, of Birmingham
aforesaid, Manufacturer, for the Invention of "AN IMPROVEMENT OR
IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS."
Sealed the 30th June 1854, and dated the 10th April 1854.
PROVISIONAL SPECIFICATION left by the said Alfred Sohier Bolton
and Francis Seddon Bolton at the Office of the Commissioners of
Patents, with their Petition, on the 10th April 1854.
We, ALFRED SOHIER BOLTON, of Birmingham, in the County of Warwick,
Manufacturer, and FRANCIS SEDDON BOLTON, of Birmingham aforesaid, Manu-
facturer, do hereby declare the nature of the Invention for "AN IMPROVEMENT
OR IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS " to be as follows:-
Our Invention consists in applying twisted tubes to the construction of steam
boilers in place of cylindrical or other tubes. The heated air in passing along
the said tubes is impeded in its motion by the inclined projections of the twist,
and made more effectually to give out its heat than where it is not so impeded.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Alfred Sohier Bolton and Francis Seddon Bolton in the
Great Seal Patent Office on the 9th October 1854.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, ALFRED
SOHIER BOLTON, of Birmingham, in the County of Warwick, Manufacturer,
and FRANCIS SEDDON BOLTON, of Birmingham aforesaid, Manufacturer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Tenth day of April, in the year of our Lord
One thousand eight hundred and fifty-four, in the seventeenth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us,
the said Alfred Sohier Bolton and Francis Seddon Bolton, Her special
licence that we, the said Alfred Sohier Bolton and Francis Seddon
Bolton, our executors, administrators, and assigns, or such others as we, the
said Alfred Sohier Bolton and Francis Seddon Bolton, our 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 "AN IMPROVEMENT OR IMPROVEMENTS IN THE CONSTRUC-
TION OF STEAM BOILERS," upon the condition (amongst others) that we, the
said Alfred Sohier Bolton and Francis Seddon Bolton, by an instrument in
writing under our hands and seals, or under tlie hand and seal of one of us,
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 Francis Seddon Bolton, on behalf of
myself and the said Alfred Sohier Bolton, do hereby declare the nature of the
said Invention, and in what manner the same is to be performed, to be par-
ticularly described and ascertained in and by the following statement thereof
(that is to say)—
Our Invention relates to such steam boilers as have tubes passing through
their interiors, through which said tubes the flame and heated air of the
furnace pass, and consists in the substitution of twisted tubes in place of the
cylindrical or taper tubes usually employed. The flame and heated air from
the furnace in passing through the said tubes are impeded in their motion by
the inclined projections of the twist in the said tubes, and the said flame and

page_text: heated air are thus made more effectually to give out their heat to the said
tubes than when their motion is not impeded. In carrying our Invention into
effect, we use tubes in which the helical flute constituting the twist is either
convex or concave, and the said tube may either have the same diameter
throughout its whole length, or its diameter may gradually diminish from one
end to the other. We do not confine ourselves to any particular size or
number of the helical flutes constituting the twist of the tube; we prefer,
however, to have a small number of the said flutes, and to make the same of
such size that each of the said flutes shall pass once round the tube in a length
equal to about three times the diameter of the said tubes.
The cleaning of boilers having tubes made according to our Invention may
be effected either by blowing steam or air through the same, or by pulling or
forcing a brush or pledget of tow or other fibrous substance through each of the
said tubes.
Having now described the nature of our said Invention, and the manner of
carrying the same into effect, we wish it to be understood that we do not limit
ourselves to the precise method herein described, as the same may be varied
without departing from the nature of our said Invention; but we claim as
our Invention, the use of twisted metallic tubes in the construction of steam
boilers, as herein described.
In witness whereof, I, the said Francis Seddon Bolton, have hereunto
set my hand and seal, this Seventh day of October, in the year of our
Lord One thousand eight hundred and fifty-four.
Witness,
RICHARD SKERRETT.
FRANCIS SEDDON BOLTON. (L.S.)