Improvements in Steam Boilers.
Year: 1893

page_text: Date of Application, 14th Nov., 1893
Complete Specification Left, 14th Aug.. 1894-Accepted, 14th Nov.,
1894
Improvements in Steam Boilers.
We, WILLIAM DONALD and JAMES DONALD Junior both of the Firm of
Hanna Donald & Wilson, Engineers, Paisley, Renfrewshire, do hereby declare the
Dature of this invention to be as follows:-
This invention is a development of the improvements in steam boilers described
in the Specification of Letters Patent granted to us and numbered 1889 of 1892.
and it has for its objects to provide more convenient access to the tubes in boilers.
of that type and to ensure better utilization of the heat generated by combustion of
the fuel in the furnaces.
As regards the arrangement of the steam and water drums and the connecting
water tubes the improved boiler resembles that described in the Specification of
Letters Patent above referred to but the drums are preferably made cylindrical
with manholes to permit of expanding the ends of the tubes into orifices in the
drums. The main rows of tubes are placed at such distances apart as to permit
of readily removing and renewing any individual tube and additional heating
surface is obtained by means of one or more rows of tubes extending in a vertical
or approximately vertical line from the lower to the upper drum whilst two fires.
are used and placed one on each side of the central row of tubes so as practically
to form two furnaces within the outer rows of tubes in the case of a single ended
boiler and four fires or furnaces in the case of a double, ended boiler.
The fire gases rising from the furnace may be carried directly through the outer
rows of tubes to the chimney but under a modified arrangement walls or baffle
plates are built or fitted between the rows of tubes to form flues so that the fire
gases are led from the furnaces to impinge on either the inner or outer rows of
tubes and are caused to return through the outer or inner rows. The fires may be
placed externally under the outer rows of tubes the return flue when such is
provided carrying the gases back through between the tubes of the central row or
the fires may be situated between the central and outer rows of tubes in which case
an ash box is or may be provided under each fire grate to constitute the flue wall
or part of it when the gases are returned through between the tubes of the outer
rows. An outer casing with suitable doorways to give access to the drums and
tubes is provided as usual.
Dated this 13th day of November 1893.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
We, WILLIAM DONALD and JAMES DONALD, Junior, both of the Firm of
Hanna, Donald & Wilson, Engineers, Paisley, Renfrewshire, 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 :-
This invention is a development of the improvements in steam boilers described
in the Specification of Letters Patent granted to us and numbered 1889 of 1892
and it has for its objects to provide more convenient access to the tubes in boilers.
Price 8d.1

page_text: of that type and to ensure better utilization of the heat generated by combustion
of the fuel in the furnaces.
The invention is illustrated by the accompanying drawings Figure 1 being a
part front view and part vertical section of our improved boiler of the single
ended type, Figure 2 a longitudinal section of same, Figure 3 a longitudinal
section of a double ended boiler of similar construction to Figures 1 and 2;
while Figures 4, 5, and 6, 7, 8 and 9, 10, 11 and 12 are like views respectively
of modified forms of said boiler.
Referring to Figures 1 to 6 the tubes A are placed at such distances apart
as to permit of readily removing and renewing any individual tube and additional
heating surface is obtained by means of one or more rows of tubes B extending
in a vertical or approximately vertical line from the lower drum C to the upper
drum D whilst two fires E are used and placed one on each side of the central
row of tubes B so as practically to form two furnaces within the outer rows of
tubes A in the case of a single ended boiler as at Figures 1 and 2 and four
fires or furnaces E in the case of a double ended boiler as at Fig. 3, or the
furnaces may be placed external to the tubes as indicated at Figures 4, 5 and 6.
In either case the fire gases rising from the furnace pass directly through the
outer rows of tubes A to the chimney but under the modified arrangements
indicated by Figures 7 to 12 walls or baffle plates G are built or fitted between
the rows of tubes A, B, to form flues so that the fire gases are led from the
furnaces E to impinge on either the inner or outer rows of tubes and are caused
to return through the outer or inner rows. The fires E may be placed externally
under the outer rows of tubes A as indicated by Figures 10, 11 and 12 the
return flue carrying the gases back through between the tubes of the central
row B or the fires may be situated between the central and outer rows of tubes
in which case an ash box H is or may be provided, under each fire grate to con-
stitute the flue wall G or part of it when the gases are returned through
between the tubes of the outer rows. An outer casing with suitable doorways
to give access to the drums and tubes is provided as usual.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
A tubulous steam boiler constructed and arranged substantially as described
with reference to the annexed drawings.
Dated this 13th day of August 1894
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents."
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.