IMPROVEMENTS IN BLOW PIPES
Year: 1877

page_text: LETTERS PATENT to Thomas Fletcher, of Warrington, in the County of Lan-
caster, for the Invention of "IMPROVEMENTS IN BLOW PIPES."
PROVISIONAL SPECIFICATION left by the said Thomas Fletcher at the Office
of the Commissioners of Patents on the 12th May 1877.
THOMAS FLETCHER, of Warrington, in the County of Lancaster. "IMPROVEMENTS
IN BLOW PIPES."
This Invention relates to the construction of a blow pipe, capable of utilising the
waste heat of the flame itself, for the purpose of heating the air previous to its
escaping at the nozzle, and whereby the power of the blow pipe is considerably
increased. This is effected by arranging the blow pipe at or near the nozzle in the
form of a coil or air chamber, which, being held over that part of the flame not
utilised by the jet itself, so heats the air passing through the blow pipe, and
materially increases the effective heating power of the issueing jet or blast, and
which is still free to act upon the most powerful part of the flame, as heretofore..
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Fletcher in the Great Seal Patent Office on the 12th
November 1877.
THOMAS FLETCHER, of Warrington, in the County of Lancaster.
IN BLOW PIPES."
"IMPROVEMENTS
This Invention relates to the construction of a blow pipe, capable of utilising the
waste heat of the flame itself, for the purpose of heating the air previous to its
escaping at the nozzle, and whereby the power of the blow pipe is considerably
increased. This is effected by arranging the blow pipe, as seen in the accompanying
Drawing, at or near the nozzle a in the form of a coil b. In using the blow pipe
the coil b is held in the flame of the candle or other flame employed, so as to permit

page_text: part of the flame to pass through such coil, and thus to heat the air passing
through the blow pipe previous to its issuing at the nozzle, whilst the other and
most powerful part of the flame is still utilised, as heretofore, for forming the blow
pipe jet. I am thus enabled to materially increase the power of a blow pipe,
and to produce a degree of heat hitherto unattainable by the ordinary blow
pipe.
It will thus be apparent that the important feature in my Invention is the coil b.
Instead of this coil I might employ an air chamber or an enlargement of the blow
pipe at this part for the same purpose, but it will be obvious that this would
simply be a less effectual way of arriving at the same result, and which I should
consider a modification of my Invention.
Although I have only shewn and described my improvements as applied to a
hand blow pipe. it will be readily seen that the same are applicable to blow pipes
actuated by bellows, or other blowing contrivences.
Having thus particularly described and ascertained the nature of this my said
Invention, together with the best methods with which I am acquainted for carrying
the same into practical effect, I wish it to be distinctly understood that I claim,
constructing blow pipes with a coil or air chamber, substantially as and for the
purpose herein-before described and illustrated on the accompanying Drawing.
In witness whereof, I, the said Thomas Fletcher, have hereunto set my hand
and seal, this 9th day of November, in the year of our Lord One thousand
eight hundred and seventy-seven.
THO. FLETCHER. (L.S.)