IMPROVEMENTS IN THE CONSTRUCTION OF BOILERS FOR GENERATING STEAM."
Year: 1880

page_text: LETTERS PATENT to James Humphrys, of Barrow-in-Furness in the County
of Lancaster, for an Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF
BOILERS FOR GENERATING STEAM."
PROVISIONAL SPECIFICATION left by the said James Humphrys at the
Office of the Commissioners of Patents on the 28th October 1880.
JAMES HUMPHRYS, of Barrow-in-Furness, in the County of Lancaster.
"IMPROVEMENTS IN THE CONSTRUCTION OF BOILERS FOR GENERATING STEAM."
My Invention consists in an improved method of joining the shell plates and
other plates of boilers. According to my Invention I form the end or ends of each
plate with two tail pieces, one on either side of the end; these tail pieces are
planed or otherwise formed of a wedge shape, so that the overlap plate coming over
these tail pieces at the joint forms a neat and even joint, instead of leaving as by the
present system a hole or space which can never be properly caulked tight. The
wedge shaped or tapered tail pieces in a joint according to my Invention fill up this
space, add considerable strength to the structure, and ensure a perfectly tight joint,
the rivetting of the joint passing through the tail pieces as well as the ends of the
plates.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Humphrys in the Great Seal Patent Office on the 26th
April 1881.
JAMES HUMPHRYS, of Barrow-in-Furness, in the County of Lancaster.
"IMPROVEMENTS IN THE CONSTRUCTION OF BOILERS FOR GENERATING STEAM."
My Invention consists in an improved method of joining the shell plates and
other plates of boilers. According to my Invention I form the end or ends of each
plate with two tail pieces, one on either side of the end; these tail pieces are
planed or otherwise formed of a wedge shape, so that the overlap plate coming over
these tail pieces at the joint forms a neat and even joint, instead of leaving as by
the present system a hole or space which can never be properly caulked tight. The
wedge shaped or tapered tail pieces in a joint according to my Invention fill up
this space, add considerable strength to the structure, and ensure a perfectly tight
joint, the rivetting of the joint passing through the tail pieces as well as the ends
of the plates.
That my Invention may be clearly understood I have hereto annexed a Sheet
of Drawings marked with letters and figures of reference corresponding with those
in the following explanation, like letters being used to denote like parts in the
various views.
In the example of my Invention shown in the Drawings,
Figure 1 is an outside view of a portion of the shell rivetting of a boiler
constructed according to my Invention.
Figure 2 is a section at X, X, Figure 1.
Figure 3 shows the butt and lap of plate (illustrated at Figure 1) separated.
It will be seen that according to my Invention I form the end of each plate A
with two tail pieces B, one on either side of the end of the plate A. The tail
pieces B are planed or otherwise formed of a wedge shape (see Figure 2). The
plate A' coming over the tail pieces B at the joint B forms a neat and even joint,
instead of leaving a hole or space at B' which can never be properly caulked tight.
The wedge tail pieces B according to my Invention fill up this space B', add
considerable strength to the structure, and ensure a perfectly tight joint, the
rivetting of the joint passing through the tail pieces as well as the ends of the
plates, as shown in the Drawings.
Having now described my Invention and shown how the same may be put into
practice, I claim,―
First. Constructing boilers for generating steam, wholly or partly of plates
having tail pieces, such as B, as herein described and shown in the Drawings hereto
annexed.
Second. The use of plates having tail pieces, such as B, for steam boilers,
substantially as herein described, shown in the Drawings hereto annexed, and for
the purposes specified.
In witness whereof, I, the said James Humphrys, have hereunto set my hand
and seal, this Twenty third day of April, in the year of our Lord One
thousand eight hundred and eighty one.
JAMES (L.S.) HUMPHRYS.