improvements in Steam and other Boilers.
Year: 1887

page_text: PROVISIONAL SPECIFICATION.
improvements in Steam and other Boilers.,
We, THOMAS ALFred York, of 96 Inkerman Street, Wolverhampton, in the County
of Stafford, Millwright and JOHN CLARK EDWARDS, of Harlech House, Merridale Lane,
Wolverhampton, aforesaid, edge tool manufacturer, do hereby declare the nature of
this invention to be as follows:-
This invention has for its object improvements in the construction of steam boilers,
and other boilers such for instanco as Cornish and Lancashire boilers used for heating
water for baths and laundries, for the purpose of greatly increasing their efficiency
and economical working.
According to this invention a water tube is placed longitudinally within the flue
tube of a Cornish boiler, or within each such tube of a Lancashire boiler, or within
the vertical tube of a Rastrick boiler, or within a corresponding tube, or each corre-
sponding tube, of other description of boiler, and when placed in a horizontal or
approximately horizontal position is connected, both at its under and upper sides by
means of a short tube or tubes, with the water space surrounding the tube in which it
is placed, and when placed in a vertical or approximately vertical position is connected
at its lower end with such water space in a similar inanner, and is open to the water
space at its top where it is fixed to the crown of the flue tube.
This water tube is of such diameter as will leave around it a sufficient space for the
passage of the heated gases from the furnace.
In order to facilitate the circulation of the water through and within the water
tube, the feed water may, if desired, be introduced into the boiler through such
tube.
The employment of a water tube or tubes in the manner described adds considerably
to the heating surface of the boiler and effects greatly increased efficiency and economy
in working.

page_text: When the water tube is placed within a fluc tube of such a boiler as one of the
Cornish or Lancashire type it terminates in one direction at a point somewhat beyond
the fire-bridge, and may be carried forwards beyond the back end of the boiler and
across the end fluc. The end of the tube which meets the draft from the furnace may
be advantageously formed of a domed shape, or egg-ended.
The water tube may, if desired, be fitted with a fluc tube, or with a number of
small flue tubes, running longitudinally there through, to still furthur increase the
heating surface, in which case it may be found convenient not to carry the water
tube beyond the back end of the boiler, in the case of such a boiler as one of the
Cornish or Lancashire type.
1003
STEPHEN WATKINS,
Wolverhampton and Walsall,
Agent for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Steam and other Boilers.
We, THOMAS ALFRED YORK, of 96 Inkerman Street; Wolverhampton in the County
of Stafford, millwright, and JOHN CLARK EDWARDS, of Harlech House, Merridalo
Lane, Wolverhampton, aforesaid, edge tool manufacturer, 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, reference being had to
the accompanying drawings and the letters of reference marked thereon (that is to
say) :-
This invention has for its object improvements in the construction of steam boilers
and other boilers (such for instance as Cornish and Lancashire boilers used for
heating water for baths and laundries) which have or are capable of being
fitted with internal flue tubes the result attained thereby being greatly increased
efficiency and economy in working. The invention is also applicable to the fire
boxes of boilers of the vertical portable type.
According to this invention a water tube is placed longitudinally within the flue
tube of a Cornish boiler, or within each such tube of a Lancashire boiler, or within
the vertical tube of a Rastric boiler, or within a corresponding tube, or each corre-
sponding tube, of other description of boiler, or within the fire-box of a vertical boiler
of the portable type, and, when placed in a horizontal or approximately horizontal
position, is connected, both at its under and upper sides, by means of a short tube or
tubes with the water space surrounding the tube. in which it is placed, and when
placed in a vertical or approximately vertical position is connected at its lower end
with such water space in a similar manner and is similarly connected with or
is otherwise open to the water space at its top. The water tube is of such a
diameter as will leave around it and within the tube or box in which it is placed
a sufficient space for the passage of the heated gases from the furnace, proper
allowance being made for the obstruction caused by the connections between the
tubes, or tube and box. The connections may be of any convenient character and
in any convenient position either around the sides or at the ends of the water tube as
will ensure the circulation of the water through the tube.
This invention will be readily understood on reference to the accompanying
drawings. of which figure 1 is a longitudinal vertical section through a Lancashire
boiler taken along the centre of one of the flue tubes (on line of figure 2)
and shews the invention applied to this type of boiler; figure 2 is a transverse
section taken on line y y of figure 1; figure 3 shews the application of the
invention to the flue tube of a Cornish boiler, the view being a transverse section
through such boiler; figure 4 shews the application of the invention to a boiler
of the vertical portable type, the view being a vertical section through the centre
of such a boiler figure 5 is a longitudinal section through a boiler of the loco-
motive or ordinary portable type, but with a large internal tube formed therein
for the reception of the water tube; figure 6 is a vertical section shewing. the

page_text: application of the invention to a Rastric boiler; and figure 7 shews, in longitudinal
section, the application of the invention to a boiler of the marine type. The parts
in the different views which correspond to, or take the place of, one another are
similarly lettered.
Referring to figures 1 and 2, a water tube A is placed within each of the internal
flue tubes B and is of such diameter as to allow proper flue area between itself and
the interior of the tube B with proper allowance for the obstruction caused by the
connections between the tubes; this tube A terminates at its front end somewhat
beyond the fire-bridge C as shewn, and it may terminate at its back end so as to be
flush, or approximately so, with the back end of the boiler, or it may be continued, as
shewn, through the back end flue, in which latter case it may be conveniently provided
with a manlid for access for cleaning and-inspection. Each tube A may be con-
veniently connected with the corresponding tube B, and with the water space
surrounding such tube, by means of double angle rings a a, as shewn, in which case
such rings may first be riveted around openings in the tube A and after the tube has
been placed in position such rings may be riveted around corresponding openings in
the tube B. The passages thus formed between the tubes A and the water space of
the boiler may be arranged in any convenient positions, and there may be any number
of such openings; and when large sizes of tube are employed the openings may be of
such size as will allow of a person passing therethrough. If it is desired, a concentric
flue tube (figure 2) may pass longitudinally through the tube A, or a number of
small flue tubes (c c etc. figure 2) may pass therethrough in lieu of the larger tube b,
but in either of such cases of course the back end of the tube A should be kept flush,
or approximately so, with the back end of the boiler so that the flue tubes may
communicate with the back end flue.
The application of the invention to a flue tube of a Cornish boiler, and which is
illustrated by figure 3, is the same as to the flue tubes of a Lancashire boiler.
Referring now to figure 4, a short vertical water tube A is placed within the
vertical fire-box B of a boiler of the vertical portable type so as to leave sufficient
space around such tube and within the fire-box for the passage of the heated gases
from the furnace. The lower part of the tube A is connected with the water space C
around the fire-box by means of short tubes dd, which may be screwed through the
fire-box and into the tube A, and the upper end of such tube is connected with the
water space above the fire-box by means of short tubes d' d' which may be screwed
through the roof of the fire-box and into the top plate of the tube A. Any desired
number of these tube connections may be made. Vertical flue tubes c c etc. may pass
up through the tube A, if desired, and thus add to the heating surface;
Referring now to figure 5, a large internal flue tube-B is placed longitudinally
within a boiler of the locomotive or ordinary portable type so as to communicate
between the fire-box D and the smoke box, the latter of which is not shewn in the
illustration. Within the tube B is placed a water tube A, corresponding to and for
the purpose of the tube A shewn by figure 1, and this water tube may project
somewhat into the fire-box D) and also into the smoke box, and may be connected to
the tube B and with the water space therearound similarly as the tube A, figure 1,
is connected, or in any convenient manner; and, if desired, a concentric flue tube,
corresponding to the tube figure 2, or a number of smaller flue tubes c c etc. may
pass longitudinally through the tube A..
Referring now to figure 6, a vertical water tube, A is placed within the vertical flue
tube B of a Rastric boiler. This tube may be connected at or near its lower end with
the fiue tube B and with the water space therearound by means of double angle
rings a a, as shewn, and may be connected at its top with the crown of the flue tube B
and with the water space thereabove by-means of a vertical tube d'.
Referring now to figure 7, a water tube A is shewn as placed within the flue
tube B of a boiler of the marine type. This tube A is shewn to be fixed within
the tube B similarly as the tube A figure 1 is fixed within its corresponding tube B.
This tube A also may, of course, have one or more flue tubes passing longitudinally
through it, if desired.

page_text: When it is not desired to carry a flue tube or tubes through a water tube A the end
of such tube which meets the draught from the furnace may be advantageously domed
or cambered as shewn by figure 1.
Special means have been described above for connecting the internal flue tube with
the tube or fire-box within which it is placed, but any convenient means may be
adopted for the purpose.
In order to facilitate the circulation of the water through and within the water
tube A, the feed water may, if desired, be introduced into the boiler through such
tube.
The employment of a water tube within a flue tube in the manner described adds
considerably to the heating surface of the boiler and effects greatly increased efficiency
and economy in working.
It will be seen that a water tube of a size which will allow proper circulation of the
water therethrough may be placed in the manner described in any internal flue tube
which is of a size which will admit thereof and allow of the passage of the gases
between the tubes. When the water tube is small it may be conveniently carried out
beyond both ends of the flue tube and be brought round and screwed or otherwise
fixed direct into the plates of the boiler so as to communicate with the water space, or
such tube may be fixed in any convenient manner.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a steam or other boiler a water tube fixed longitudinally (that is in the
direction of the passage of the gases from the furnace) within an internal flue tube
(or fire-box of a boiler of the vertical portable type) and connected so as to com-
municate with the water space in the boiler, substantially as described, for the purpose
set forth.
2. The several modifications of the application of a water tube to an internal fluc
tube (or fire-box of a boiler of the vertical portable type) substantially as described
with reference to the drawings herewith, for the purpose set forth.
Dated this 29th dox of Tuna isse
STEPHEN WATKINS,
Wolverhampton and Walsall,
Agent for the Applicants.