IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, FREDERICK DUMELLA ROSE, of Flixton, Lancashire, Engineer, do hereby
declare the nature of my invention for "IMPROVEMENTS IN THE CONSTRUCTION
OF STEAM BOILERS," to be as follows:-
The improvements relate to the construction of the cross and other tubes of
Steam Boilers, and pipes or attachments thereto such as "economiser” tubes, and
other like portions of a Steam boiler which are submitted externally to the action
of the heated gassos from the furnaces. And consist in the application to such of
corrugated plates or surfaces which are corrugated in the direction of the circumn-
ference of the tube.
To effect my improvements I construct, of any suitable metal, the cross or other
tubes in internal flued boilers; the sections of tubular or sectional boilers; the
pipes or attachments like unto "economiser" tubes, or any portion of such boiler
tubes or attachments which are subjected to the heated gasses or flame playing upon...
their external surfaces; of corrugated plates or surfaces, corrugated in the direction
of their circumference.
The corrugations may be either taper in manner like unto the flue tubes for boilers
having internal firing, for which Letters Patent have been granted me numbered 633
and dated 4th Jany 1884, or they may be corrugated equally or unequally all round
their circumference, or they may have a portion only of their circumference corru-
gated, or they may be corrugated in the form of a Spiral. And the corrugations
may be obtained by rolling, forging, or casting as circumstances may require.
In the case of employing the taper corrugations or corrugations on one side only
of the tube I prefer that the side of maximum corrugation should be the one
exposed to the greatest heat.
The form of the corrugations may be varied as well as the amount, and portions
only of the tubes or tube or pipes or pipe may be corrugated.
I am aware that such cross and other tubes in steam boilers have already been
corrugated in the direction of their length; but these differ entirely from this my
present invention, which consists in corrugating such tubes or attachments as have
already been described, in the direction of their circumference whether in taper,
continuous, disconnected, or spiral form.
Daind & Jawamtamaha 1001

page_text: COMPLETE SPECIFICATION.
I, FREDERICK DUMELLA ROSE, of Flixton, Lancashire, Engineer, do hereby
declare the nature of my invention for "IMPROVEMENTS IN THE CONSTRUCTION OF
STEAM BOILERS" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :—
The improvements relate to the construction of the cross circulating and other
tubes of steam boilers and pipes or attachments thereto such as "economiser" tubes
and other like portions of a steam boiler which are submitted externally to the
action of the heated gases from the furnaces. And consist in the application to
Buch of corrugated plates or surfaces which are corrugated in the direction of the
circumference of the tube.
To effect my improvements, I construct, of any suitable metal, the cross circu-
lating or other tubes in internal flued boilers, the sections of tubular or sectional
boilers, the pipes or attachments like unto "economiser " tubes, or any portion of
such boiler tubes or attachments which are subjected to the heated gases or flame
playing upon their external surfaces, of corrugated plates or surfaces, corrugated in
the direction of their circumference. The corrugations may be either taper in
manner like unto the flue tubes for boilers having internal firing, for which Letters
Patent have been granted me numbered 633 and dated January 4th 1884, or they
may be corrugated equally or unequally all round their circumference in parallel or
nearly parallel corrugations, or they may have a portion only of their circumference
corrugated, or they may be corrugated in the form of a spiral.
And the corrugations may be obtained by rolling, forging, or casting, as circum-
stances may require.
In the case of employing the taper corrugations or corrugations on one side only
of the tube I prefer that the side of maximum corrugation should be the one
exposed to the greatest heat.
The form of the corrugations may be varied as well as the amount, and portions
only of the tubo or tubes, or pipe or pipes, may be corrugated, leaving portions
theroof plain.
I am aware that such cross and other tubes in steam boilers have already been
corrugated in the direction of their length; but these differ entirely from this my
present invention, which consists in corrugating such tubes or attachments, as have
already been described, in the direction of their circumference, whether in taper,
parallel or nearly parallel, continuous, disconnected, or spiral form.
But that the improvements may be better understood' I will by the aid of the
accompanying drawings proceed more fully to describe means employed by me.

page_text: Fig. 1. shows a taper cross circulating tube formed with taper corrugations after
the manner of corrugation laid down in my specification number 633, 1884, and is
most suitable for cases where the heated gases play or impinge upon one side of the
tube.
Fig. 2. shews a similar tube corrugated all round the same with parallel or nearly
parallel corrugations.
Fig. 3. shews a similar tube formed with a spiral corrugation.
Fig. 4. shows a corrugated tube formed with portions left plain, and Fig. 5.
shews an economiser or other tube or connection of a boiler, corrugated in various
ways. These corrugations may be formed in any convenient manner; but by pre-
ference by means of my patented corrugating machine as described in specification
number 5634 of March 29th 1884.
The tubes may be cast, rolled, drawn, or otherwise formed, and may be corru-
gated in the forming operation or as a subsequent process; and two or more of the
particular forms of corrugation may be combined in one tube; and the tubes may
be constructed of brass, copper, iron, steel, or other suitable metal or alloy.
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 construction of cross circulating and other tubes or connections in or of
steam boilers, which tubes or connections aro externally exposed to the heated
gases, with corrugations or corrugated surfaces in the direction of their circum-
ference, in manner substantially as shewn and described.
WILLIAM GADD, C.E.,
64, Barton Arcade, Manchester,
Agent.