An Improved Steam Boiler.
Year: 1888

page_text: Date of Application, 14th Nov., 1888
Specification Accepted, 14th Dec., 1888
An Improved Steam Boiler.
I, THOMAS LAWSON of 64 Winchester Street, South Shields, in the county of
Durham Boilersmith 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 an improved steam boiler and consists in an improved
arrangement or combination of parts having for its object the economical and rapid
generation of steam. I will now fully describe my invention having reference to the
accompanying drawings in which Fig. 1 represents a sectional elevation of a vertical
steam boiler arranged according to my invention Fig. 2 being an half sectional plan
on line ху in Fig. 1 and throughout this description similar letters of reference in the
specification and in the drawings designate corresponding parts.
I
a is the outer boiler shell connected by screwed stays b in the usual way to the
inner shell c of the combustion chamber d and within the said combustion chamber
arrange the tank or vessel e. This tank is held in position by means of the screwed
and nutted tubular stays e¹ and the Galloway tubes which serve both as stiffening
stays or suspenders for holding the tank e in its position within the combustion
chamber and as water ducts to connect the interior of tank e with the water spaces f
of the boiler. The base of the tank e is made concave relatively to the furnace as
shown in Fig. 1 which has the effect of presenting an increased heating surface to the
action of the flame and at the same time by the concavity itself not only is the flame
delayed or arrested in its exit to the chimney g thereby economising heat but the
arched form is that best suited to resist the pressures acting on it from above. The
heat and flame are thus by my improved arrangement caused not only to act against
the whole of the interior surface of the combustion chamber d but also against the
whole of the exterior heating surface of the tank e as well as against the exterior heating
surfaces of the tubular stays e¹ and the Galloway tubes e². The heating surface thus
obtained is very great and the steam generative powers of the boiler are proportionally
increased. The number of stays and Galloway tubes may be arranged according to
the best well known practice of manufacturers the number varying of course with the
size of boiler to be constructed.

page_text: m is the firegrate m² the fire door m² the steam space m³ are manholes protected by
dogged doors in the usual way and at least one sludge pipe should be provided
connecting the base of the tank e with the external water space of the boiler for the
purpose of allowing the said tank to be readily and efficiently cleansed.
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) In a vertical steam boiler the combination with the combustion chamber of an
inner concave based steam generating. tank or vessel e connected to the shell c of the
combustion chamber d by tubular stays ee and having its concave base arranged
immediately over the firegrate the said combination of parts being arranged and
operating substantially as and for the purposes hereinbefore described and illustrated
in the annexed drawings.
Dated this.13th day of November 1888
A. CRAWHALL CHAPMAN,
2, St. Nicholas' Buildings, Nowcastle-on-Tyne,
Patent Agent for Applicant.