Improvements in Tubes for Steam Generators.
Year: 1895

page_text: Date of Application, 6th Aug., 1895
Complete Specification Left, 29th Apr., 1896-Accepted, 30th May, 1896
PROVISIONAL SPECIFICATION.
Improvements in Tubes for Steam Generators.
I, SAMUEL EARNSHAW HOWELL of the Sheffield Tube Works, Wincobank,
in the County of York, Manufacturer, do hereby declare the nature of my invention
to be as follows:-
The object of my invention is the more rapid generation of steam, and the more
effective circulation of the water in the generator.
The invention is of a very simple character, and consists in the introduction of a
small diameter tube into the interior of the ordinary tube preferably at the end
nearest the furnace, the said small tube being bent at each end and so fixed to the
ordinary tube that its open ends communicate with the water space.
One end opens through the lower side of the ordinary tube, and the other end
opens through the upper side of the ordinary tube, the body or intermediate part
which may be of any desired length preferably passing down the centre of the
larger tube.
Dated the 31st day of July 1895.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.
I, SAMUEL EARNSHAW HOWELL of the Sheffield Tube Works, Wincobank
in the County of York, Manufacturer do hereby declare the nature of this inven-
tion and in what manner the same has to be performed, to be particularly described
and ascertained in and by the following statement :-
My invention relates to improvements in or connected with tubes for steam
generators or boilers, with the object of producing a more rapid circulation and
generation of steam.
The method of carrying the invention into effect which I prefer, is illustrated in
the annexed sheet of drawings, in which
Fig. 1, represents in vertical section, a boiler tube with an internal circulating
tube also in section.
Fig. 2, is a plan of part of such boiler tube showing the opening into the
small tube.
Fig. 3, is a transverse section of same.
Similar letters of reference indicate similar parts in all the said figures.
My invention is of a very simple character and according to the arrangement
which I prefer and which is illustrated, it consists in the introduction into the.
interior of an ordinary boiler tube A, and preferably at the end of the tube nearest
the furnace, of a tube B, of smaller diameter, and of any desired length, the said
tube being bent at each end, and so fixed at both ends into the boiler tube that
there is a free passage through it into the water space.
One end opens at C, through the underside of the boiler tube A, and the other

page_text: end C' opens through the upper side of the boiler tube, but I do not bind myself
to the position of the two openings C, and C³, as these may be varied.
The junction of the two tubes must be made watertight and secure and I find
that by expanding the end of the small tube when in position and brazing or welding
the two together a perfectly satisfactory joint can be produced, but other means
may be adopted if desired, such as screwing the ends of the internal tube, and using
a washer with a concaved underside to fit upon the outside of the tube A, and a
screwed nut.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :
In combination with a tube of a tubular boiler, an internal tube of smaller
diameter having its ends bent and secured in the sides of the boiler tube so as to
communicate with the water space outside the boiler tube, substantially as and for
the purpose set forth.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.