IMPROVEMENTS IN TUBES FOR STEAM BOILERS
Year: 1879

page_text: LETTERS PATENT to Rowland Watkin Lewis, of the Firm of Edwin Lewis
and Sons, of Wolverhampton, in the County of Stafford, Tube Manufacturers,
for the Invention of "IMPROVEMENTS IN TUBES FOR STEAM BOILERS."
Sealed the 23rd September 1879, and dated the 31st March 1879.
PROVISIONAL SPECIFICATION left by the said Rowland Watkin Lewis at
the Office of the Commissioners of Patents on the 31st March 1879.
ROWLAND WATKIN LEWIS, of the Firm of Edwin Lewis and Sons, of
Wolverhampton, in the County of Stafford, Tube Manufacturers. "IMPROVEMENTS
IN TUBES FOR STEAM BOILERS."
This Invention relates to lap-welded iron and steel, and "homogeneous" metal
tubes used for locomotives and other multitubular steam boilers, and consists in the
employment of tubes covered with copper or brass, the said tubes being manu-
factured by drawing the said copper or brass on to the said iron, steel, or
homogeneous" tubes, and reducing the combined tubes thus formed by drawing
them down to the required diameter.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Rowl and Watkin Lewis in the Great Seal Patent Office on the
29th September 1879.
ROWLAND WATKIN LEWIS, of the Firm of Edwin Lewis and Sons, of
Wolverhampton, in the County of Stafford, Tube Manufacturers. "IMPROVEMENTS
IN TUBES FOR STEAM BOILERS."
This Invention relates to lap-welded iron and steel, and "homogeneous" metal
tubes used for locomotive and other multitubular steam boilers, and consists in the
employment of tubes covered with copper or brass, the said tubes being manu-
factured by drawing the said copper or brass on to the said iron, steel, or
homogeneous" metal tubes, and then reducing the combined tubes thus formed
by drawing them down to the required diameter.
"
In preparing the tubes to receive the copper or brass they are, preferably, drawn
(immediately after welding) through a cast iron chill to true them up. The face of
the chill is at right angles to the axis of the hole through it, and is ground so as
to give a sharp arris or right-angular edge to scrape the tube as it enters the hole;
the hole is parallel through the chill, and is about 2 inches long, so as to true up
the tube as it passes through. The tube is reduced somewhat at the end to enter
the hole, and is drawn through the chill by a pair of grip tongs in the usual manner.
The chill should be held quite firm in a suitable holder, and may be ground at each
end or face, so that when one edge is worn the chill may be turned from end to
end. The tubes are usually drawn through the chill twice, but may be drawn as
many times as desired; upon the second drawing through the tubes are usually
at a black heat. Water is run freely upon the tubes as they are drawn through
the chill.
Having thus described the nature of my said Invention and particularly ascer-
tained the manner of performing the same, I declare that I do not limit myself to
the exact details described, but what I claim as my Invention and desire to secure
by Letters Patent is,―
The employment of tubes constructed substantially as described, that is, iron,
steel; or "homogeneous" metal tubes, having copper or brass drawn thereupon, for
locomotive and other multitubular steam boilers.
In witness whereof, I, the said Rowland Watkin Lewis, have hereunto set my
hand and seal, this Twentieth day of September, in the year of our Lord
One thousand eight hundred and seventy-nine.
Witness,
HENRY CHILTON,
Clerk to Stephen Watkins,
Assoc. M. Inst. C.E.,
Office for Patents,
Wolverhampton.
ROWLAND W. LEWIS. (L.S.)