Year: 1887

page_text: Date of Application, 14th Mar., 1857
Complete Left, 28th Nov., 1887
Complete Accepted, 30th Dec., 1887
I, HENRY CORDEN, Boiler Smith, 147 Craven Street, Hull, do hereby declare the
nature of this invention to be as follows:-
The object of all boiler makers is to bring the tubes into as close contact with the
fire as possible and in all cases the flames striking first on one side of the tube cause
the tube either to push out the side of the fire box or else to itself bulge at its weakest
part more especially when tubes of large diameter are used. To obviate this I form
the tubes each to widen outwards from the centre in a trumpet mouthed form that is
curving outwards more and more from the centre to the extreme ends so as to increase
the strength of the tube where it is largest in diameter so as to enable it to resist the
pressure and in addition I form each half of the length of the tube at any desired
point between the centre and end to rapidly increase in diameter so as to form a
shoulder which has a two fold advantage. First, it very much strengthens the tube and
secondly serves as an expansion ring which readily yields according as the fire or cold
air may act upon the tube causing it to contract or expand.
In a vertical boiler two such bell mouthed expansion tubes may be placed horizontally
one below the other across the fire box crossing one another at the centre where their
diameter is sinallest.
The fire box as in other vertical boilers is cylindrical or somewhat conical with a
fire grate at the bottom and a flue or chimney passage at the top passing up from the
crown of the fire box and out through the top of the boiler.
CARPMAEL & Co.,
Agents for the Applicant.

page_text: Improvements in Boilers.
I, HENRY CORDEN, Boiler Smith, 147 Craven Street, Hull, 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:―
The object of all boiler makers is to bring the tubes into as close contact with the
fire as possible and in all cases the flames striking first on one side of the tube cause
the tube either to push out the side of the fire box or else to itself bulge at its weakest
part more especially when tubes of large diameter are used. To obviate this I form
the tubes each to widen outwards from the centre in a trumpet mouthed form that is
curving outwards more and more from the centre to the extreme ends so as to increase
the strength of the tube where it is largest in diameter so as to enable it to resist the
pressure and in addition I form each half of the length of the tube at any desired
point between the centre and end to rapidly increase in diameter so as to form a
shoulder which has a two fold advantage. First, it very much strengthens the tube
and secondly serves as an expansion ring which readily yields according as the fire or
cold air may act upon the tube causing it to contract or expand.
In a vertical boiler two such bell mouthed expansion tubes may be placed horizontally
one below the other across the fire box crossing one another at the centre where their
diameter is smallest. The fire box as in other vertical boilers is cylindrical or some-
what conical with a fire grate at the bottom and a flue or chimney passage at the top
passing up from the crown of the fire box and out through the top of the boiler.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a vertical section on the line a figure 2, of a boiler provided with two
tubes constructed according to my invention.
Figure 2 is a horizontal section on the line y y figure 1.
As is shown each tube consists of a double trumpet shaped surface generated by the
revolution of a curved line about an axis the curve being generally convex towards the
axis. Each half of each tube has a shoulder a a and from this shoulder to bb the tube
curves rapidly outwards the annular portion a serving as an expansion ring.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is: --
1. A double trumpet shaped boiler tube each half being provided with shoulders
between the centre of the tube and the ends substantially as described.
2. The improvements in boilers substantially as described and shown in the
drawings.
Dated this 14th day of November 1887.