Improvements in Boilers for Generating Steam and other purposes.
Year: 1891

page_text: Date of Application, 28th Mar., 1891
Complete Specification Left, 21st Dec., 1891-Accepted, 23rd Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in Boilers for Generating Steam and other purposes.
ISAAC WATT BOULTON of Portland Street Engineering Works Ashton-under-
Lyne in the County of Lancaster Engineer do hereby declare the nature of this
invention to be as follows :-
:-
This invention has for its object the providing and applying horizontal smoke
tubes and a combination of hanging water tubes to vertical boilers and the
horizontal tubes to piece or pass through the outer or cylindrical shell of the
boiler without interfering with its circular form and fixing the outer end of
the tubes in the outer shell of the boiler whereby the tubes will vary in length
and will be fastened in the outer shell in its circular form thereby leaving the
tubes of various lengths some of them beveled at the end to the circle of the
outer shell. The hanging water tubes I propose to hang in one half the diameter
of the roof of the fire box. The inside end of the smoke tubes will be fastened
in a flat, or square tube plate.
Dated this aeth d
SM 1001
ISAAC W. BOULTON.
COMPLETE SPECIFICATION.
Improvements in Boilers for Generating Steam and other purposes.
I, ISAAC WATT BOULTON of Portland Street Engineering Works, Ashton-
under-Lyne, in the County of Lancaster, Engineer, 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 relates to the construction of vertical boilers, and for providing
in the same an increased amount of heating surface and consequently greater
evaporative power or steam producing capacities, without at the same time altering
the outer form or cylinderical shell of boiler, and with but slightly modifying or
altering the ordinary construction of the inner shell or fire box, thus my invention
may be applied to existing as well as to new boilers of the vertical type. In the
construction of my boiler, I preferably employ horizontal or inclined water cased
smoke tubes in conjunction with, or without, hanging water tubes of the "Field
type and also the ordinary circulating water pipe or pipes, as usually placed
horizontally in the fire box of a vertical boiler. The lower portion of my fire box
is of the usual cylinderical form and construction, but the upper portion terminates
in a semi-circular form to the extent of half its diameter or circumference, and the
remaining half is joined or made up by a flat tube plate, in this tube plate are fixed
the horizontal or inclined water tubes, these tubes pass through the water space
and are secured by drift or tube expander into the outer cylinderical shell of boiler,
the lengths of these tubes will thus vary according to their positions horizontally in
the tube plate, due to the cylinderical form of the boiler shell, therefore, those tubes
situated in the vertical centre of tube plate will be the longest, whilst those
tubes at each outer side of the tube plate will be the shortest. The crown or top
of the fire box or furnace is of a flat form to receive the hanging "Field" type
water tubes.
In the accompanying drawing,
Fig. 1 shows a vertical section of boiler and fire box with tubes in position.
A, horizontal or inclined water cased tubes, through which the flames from
firebox F pass into the smoke box G. B, tube plate and E, cvlinderical shell of

page_text: boiler into which the horizontal or inclined tubes A are secured; D, fire box
crown plate in which the hanging Field" type tubes C, are placed; H, water
spaces.
Fig. 2 is a sectional plan of the boiler shell, tubes, and fire box crown.
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 application of horizontal or inclined water cased tubes to vertical boilers,
between the fire box and smoke box, and passing through the water space, in
conjunction with, or without the use of hanging or "Field" type water tubes in
the fire box crown.
2. The manner or method of placing these horizontal or inclined tubes and fire
box tube plate, enabling these tubes to be fitted to a vertical boiler shell without in
any way interfereing with or altering its cylinderical form to receive them; the whole
substantially as herein described and illustrated by the accompanying. drawings.
Dated this 19th day of December 1891.
ISAAC WATT BOULTON.