Year: 1897

page_text: Date of Application, 6th Jan., 1897
Complete Specification Left, 6th Oct., 1897-Accepted, 20th Nov., 1897
I WILLIAM MACKAY of 11 Kilbowie Cottages, Clydebank, Dumbartonshire, N.B.
Shipdraughtsman do hereby declare the nature of this invention to be as follows:-
or
and
This invention relates to Steam Generators, and consists of a drum, dome or other
vessel, (hereinafter called a drum) having a series of tubes connected therewith, these
tubes being inclined downwards and outwards from each side of the under surface of
the "drum," form the walls crown of the furnace. The water to be evaporated
is contained in the "drum," and in the tubes. The lower end of each tube is closed
by a plug or cap, and the bore of each tube is divided into two longitudinal
parts (hereinafter called sides) by a strip of metal or other suitable material,
this strip extends from within a short distance of the plug or cap, to the
extrémity of the upper end of the tube, which end, projects for some distance
within the aforesaid "drum"; arranged in this way each tube forms a complete
water circulator in itself, the water in that "side" of the tube which is nearest
the furnace flowing upwards; while that which is on the opposite side of the
dividing strip, flows downwards, and, passing under the end of the strips rises in the
furnace "side" of the tube, and so on. To admit of the water for the downward.
current being drawn from the lowest part of the "drum," and at the same time to
prevent the two opposite currents from interfering with each other, at, or near, the
orifice to each "side" of the upper end of each tube; the tubes are cut away (within
the drum) on that "side" which carries the downgoing current, thus bringing the
orifice to that "side" flush, or nearly so, with the inside of the "drum"; the upgoing
current being confined within the tubes on the opposite side of the dividing strip
until it passes into the "drum" from the upper extremity of each tube well clear of
the downflow orifice. While the tubes as described herein are preferably straight
I may also curve them in any desired manner. I may also curve or corrugate or
otherwise shape the dividing strip in cross section or longitudinally.
Dated this Fifth day of January 1897.
WILLIAM MACKAY.
I WILLIAM MACKAY 8 Camperdown Cottages, Scotstoun, Renfrewshire (late of
11 Kilbowie Cottages, Clydebank, Dumbartonshire) Shipyard Manager 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:-
My Invention relates to Steam Generators consisting of a Drum. Dome, or other

page_text: or
and
Vessel (hereinafter called a Drum) having a series of tubes connected therewith;
these tubes being inclined downward & outward from each side of the under surface
of the "Drumn" form the walls crown of the furnace. The water to be evaporated
is contained in the "Drum" and in the tubes. The lower end of each tube is closed
by a plug or cap, and the bore of each tube is divided into two longitudinal parts
(hereinafter called "sides") by a strip of metal or other suitable material, this strip
extends from within a short distance of the plug or cap to the extremity of the upper
end of the tube which end projects for some distance within the aforesaid "Drum,"
arranged thus, each tube forms a complete water circulator in itself, the water in
that "side" of the tube which is nearest the furnace, flowing upward, while that
which is on the opposite "side" flows downward and passing under the lower end of
the strip, rises in the furnace "side" of the tube, and so on. To admit of water for
the downward current being drawn from the lowest part of the "Drum" and at the
same time to prevent the two opposite currents from interfering with each other, at
or near the orifices to each "side" of the tube; the tubes are cut away (within the
Drun) on that "side" which carries the downward current thus bringing the orifice
to that "side" flush, or nearly so, with the inside of the shell of the "Drum," the
upgoing current being confined within the tube on the opposite side of the dividing
strip until it passes into the "Drum" from the upper extremity of the tube, well
clear of the downflow orifice. To assist in describing the nature of this invention,
sketches A. B. C and D are given herewith. Sketch A. represents the cross section
of a Steam Generator having tubes with the upper ends formed in accordance with
this specification; the formation of the upper ends of these tubes is more particularly
shown by the enlarged sketch B, the part marked (a) representing a portion of the
shell of the "Drum," while (b) is the dividing strip, (c) the downflow orifice and (d)
is the outflow orifice; the direction of flow being indicated by the small arrows.
The
same description applies to the parts correspondingly lettered on sketches C and D,
which represent alternative methods of forming the top of the tubes, the downflow
side (within the "Drum") being only partially cut away, instead of wholly, as on
sketch B. The tubes may be connected to the shell of the "Drum" by any of the
methods usually employed such as by screwing, expanding & the like. I know
that tubes with dividing strips have been in use the upper ends being however flush
with the inside of the shell of the "Drum."
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) The extending of the upflow, or furnace, "side" of the tubes (within the
Drum) for some distance past the end of the downflow "side" so that the entrance
of water to the downflow "side" may not be interfered with by the exit of water from
the upflow "side."
DaՆԵԱ ՆԱԵ ԺԿԱ
5th day of October 1897.