IMPROVEMENTS IN THE MANUFACTURE OF PIPES OR TUBES WITH EXTERNAL GILLS OR DISCS be
Year: 1884

page_text: I, JOHN CLAYTON MEWBURN of 169 Fleet Street in the City of London Fellow
of the Institute of Patent Agents do hereby declare the nature of my invention for
" IMPROVEMENTS IN THE MANUFACTURE OF PIPES OR TUBES WITH EXTERNAL GILLS
OR DISCS to be as follows:-
"
For the purpose of heating by means of water or steam, pipes or tubes of cast or
wrought iron or copper with external gills or discs have sometimes been used, these
gills or discs considerably increase the radiating surface in proportion to the
diameter of the pipes or tubes and to the amount of water or steam introduced
into them. These pipes and their gills or discs have hitherto been cast in one
piece, and one effect of this has been that the gills have been rough or uneven so
that when in use dust has adhered to them and this has interfered with the
disengagement of heat; further the pipes are very heavy, their gills are brittle
and consequently there have been difficulties in packing, transport and mounting
or fitting; the size of the gills has also been limited by the difficulties of moulding
or casting.
Now the primary object of this invention is to manufacture pipes of the kind
above referred to so that they may have a more powerful heating surface, have gills
with a simoother face, allow air to circulate freely between the gills, be light and at
the same time strong and require no packing for transport.
Instead of making the pipe and its gills or discs all of cast iron or other metal in
one piece I form the gills of another and more malleable metal which permits of
making them thinner and stronger, more regular and smooth so that they will not
retain dust and will the better conduct heat. These gills which may be of wrought
iron, copper, steel or other suitable metal, are united to the cast iron pipe at the
time of casting and form a kind of hoops which by strengthening the pipe enable
it to support high internal pressure. The pipe is cast with ribs or enlargements to
receive and surround the inner edges of the gills.

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The number, shape, size and distance apart of the gills will vary according to
the particular purpose for which the pipes are required and they may be arranged
longitudinally of the pipes instead of being placed as rings around them.
Pipes or tubes constructed according to this invention are applicable to other
purposes than for heating by means of water or steam; they may for example be
employed as tubular columns or supports in buildings in which case if the spaces
between the gills be filled in with plaster or like material the cast iron tube will
be kept from contact from flame in case of fire.

page_text: COMPLETE
SPECIFICATION.
I JOHN CLAYTON MEWBURN, of 169 Fleet Street, in the City of London, Fellow
of the Institute of Patent Agents, do hereby declare the nature of my invention
for "IMPROVEMENTS IN THE MANUFACTURE OF PIPES OR TUBES WITH EXTERNAL
GILLS OR DISCS and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
"
For the purpose of heating by means of water or steam, pipes or tubes of cast or
wrought iron, or copper, with external gills or discs, have sometimes been used';
these gills or discs considerably increase the radiating surface in proportion to the
diameter of the pipes or tubes and to the amount of water or steam introduced
into them. These pipes and their gills or discs have hitherto been cast in one
piece, and one effect of this has been that the gills have been rough or uneven so-
that when in use dust has adhered to them and this has interfered with
disengagement of heat, further, the pipes are very heavy, their gills are brittl..nd
consequently there have been difficulties in packing, transport and mounting
or fitting; the size of the gills has also been limited by the difficulties of moulding
or casting.
Now the primary object of this invention is to manufacture pipes of the kind
above referred to so that they may have a more powerful heating surface,
have gills with a smoother face, allow air to circulate freely between the gills, be
light and at the same time strong and require no packing for transport.
Instead of making the pipe and its gills or discs all of cast iron or other metal
in one piece I form the gills of another and more malleable metal which permits of
making them thinner and stronger, more regular and smooth, so that they will not
retain dust and will the better conduct heat. These gills which may be of wrought
iron, copper, steel or other suitable metal, are united to the cast iron pipe at the
time of casting and form a kind of hoops which by strengthening the pipe enable
it to support high internal pressure. The pipe is cast with ribs or enlargements to
receive and surround the inner edges of the gills.
--
The annexed drawings represent a pipe or tube manufactured according to this
invention. Figure 1 is an elevation, Figure 2 a section on the line 1----1 of
Figure 3 and Figure 3 a section on the line 2- -2 of Figure 1. a is the pipe or
tube of cast metal; b, b are the gills or discs which are united to the pipe a at the
time of casting. c, c are ribs or enlargements receiving and surrounding the inner
edges of the gills.
The number, shape, size and distance apart of the gills will vary according to the
particular purpose for which the pipes are required, and they may be arranged
longitudinally of the pipes instead of being placed as rings around them as in the
drawings.
Pipes or tubes constructed according to this invention are applicable to other
purposes than for heating by means of water or steam; they may for example be

page_text: .
employed as tubular, columns or supports in buildings in which case if the spaces
between the gills be filled in with plaster or like material the cast iron tube will be
kept from contact from flame in case of fire.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
The manufacture of pipes-or tubes with external gills or discs substantially in
the manner herein before described.