Improvements in the Manufacture of Metal Tubes.
Year: 1898

page_text: Date of Application, 23rd Sept., 1898
Complete Specification Left, 14th Feb., 1899-Accepted, 18th Mar., 1899
Date of Application, 2010 Sept. 1
Complete Specification Left, 14th Feb., 1899-Accepted, 18th Mar., 1899
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Metal Tubes.
I, THOMAS BARTON, of The Electric Works, Blackburn, in the County of
Lancaster, Electrical Engineer, do hereby declare the nature of this invention
to be as follows:-
-
My invention relates to improvements in the manufacture of metal tubes, and
the chief object of my improvements is to make a cheap and strong air tight
tube, without welding, brazing, or drawing, such tubes being well adapted as
conduits for carrying electric lighting and other electric wires throughout
buildings, for pneumatic tubes, and many other purposes.
In carrying my invention into effect I take a steel, or iron, or other metal
tube, in which the adjoining edges are brought close together but are not joined ;
these tubes have been used as conduits for electric wires but they are objected to
for want of safety against fire.
According to my invention I pass the tubes through a galvanizing process by
which a substantial metal joint is obtained in a cheap and simple manner.
To make a true galvanized joint the tube is first coated with tin along the
joint, or all over as preferred, and then immersed in a bath containing fluid zinc,
covered with sal-ammoniac, as in the ordinary galvanizing process, or the tube
may be simply dipped in a bath of melted zinc, and sal-ammoniac, or its equiva-
lents, this latter process producing a metal joint sufficiently good for some
purposes.
If found desirable the metal joint might be made with tin only.
Improvements in the Manufacture of Metal Tubes.
I, THOMAS BARTON, of The Electric Works, Blackburn, in the County of
Lancaster, Electrical Engineer, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
My invention relates to improvements in the manufacture of metal tubes, and
the chief object of my improvements is to make a cheap and strong air tight
tube, without welding, brazing, or drawing, such tubes being well adapted as

page_text: conduits for carrying electric lighting and other electric wires throughout
buildings, for pneumatic tubes, and many other purposes.
In carrying my invention into effect I take a steel, or iron, or other metal
tube, in which the adjoining edges are brought close together but are not joined;
these close jointed tubes have been used as conduits for electric wires but they
are objected to for want of safety against fire on account of the joint not being
made airtight.
According to my invention I pass the tubes through a galvanizing process by
which a substantial metal joint is obtained in a cheap and simple manner.
To make a true galvanized joint the tube is first coated with tin along the
joint or all over as preferred, and then immersed in a bath containing fluid zinc
covered with sal-ammoniac, as in the ordinary galvanizing process, or the tube
may be simply dipped in a bath of melted zinc and sal-ammoniac or its equiva-
lents, this latter process producing a metal joint sufficiently good for some
purposes.
If found desirable the metal joint might be made with tin only.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
claim is
A close jointed metal tube having its adjoining edges closed and made airtight
by a galvanizing process substantially as herein set forth.
Dated this 13th day of February 1899.
H. B. BARLOW & GILLETT,
Agents for Applicant, 17, St. Ann's Square, Manchester.