Year: 1896

page_text: Date of Application, 19th May, 1896
Complete Specification Left, 16th Sept., 1896-Accepted, 24th Oct., 1896
JOHN PERCY HALL, Engineer, Carville, Laurie Park Road, Sydenham, do
hereby declare the nature of this invention to be as follows:-
The object of my invention is the construction of steam boilers or generators
suitable for sea going or other vessels, or other purposes, where high pressures are
required.
1 construct a steam generator with three circular chambers or drums, placed one
above and two below, the lower drums are water chambers only and the upper
drum is partly a water chamber and partly a steam chest. Rows of small tubes
are fitted between the top chamber and the bottom chambers, these tubes may be
either straight or bent as required.
The position of each tube in a row will be on the vertical line of the circumference
of each drum, or the tubes may be pitched zigzag about such line, the outer tubes
being removeable without disturbing its neighbour on either side or the tube behind
it in the same row. In the case of a defect in any one tube, only itself & those in
front of it in the same row will have to be drawn."
I also place a row or rows of tubes on each side, close together, forming a wall,
for the purpose of collecting any heat which may otherwise escape, these tubes or
pipes are carried into the upper part of the top chamber, and the surface above
the water line will act for the purpose of drying or superheating the steam formed
in these tubes. These tubes are placed on the outside of the main tubes, thus
leaving a space for the combustion of any unconsumed gases.
Any of the tubes may be removed and replaced without any interference of the
casing of the boiler.
The fire grate is placed between the water chambers.
The whole of one or more such boilers except the ends of the drums is encased
in brickwork, tiles, iron, or any suitable casing, with or without non conducting
protection, and the waste products of combustion are led away in the usual
manner.
In order that my said invention may be fully understood and readily carried into
effect, I will now proceed to describe my drawing annexed.

page_text: Improved Water Tube Boiler.
I JOHN PERCY HALL Carville Laurie Park Road Sydenham S.E. 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:-
The object of my invention is the construction of steam boilers or generators
suitable for sea going or other vessels-or other purposes-where high pressures-
lightness, and rapid generation of steam are required.
I construct a steam generator with three circular chambers or drums placed one
above and two below-the lower drums are water chambers only-and the upper
drum is partly a water chamber and partly a steam chamber. Rows of small tubes
are fitted between the top chamber and the bottom chambers-these tubes may be
either straight or bent as required.
The position of each tube in a row will be on the vertical line on the circumference
of each drum, or the tubes may be pitched zig zig about such line-the outer tubes
being removeable-without disturbing its neighbour on either side or the tube
behind it in the same row. In the case of a defect in any one tube-only itself
and those in front of it in the same row will require to be drawn.
I also place a row or rows of tubes on each side, close together, forming a wall,
for the purpose of collecting any heat which may otherwise escape, these tubes or
pipes are carried into the upper part of the top chamber-and the surface above
the water line will act for the purpose of drying or superheating the steam formed
in these tubes. These tubes are placed on the outside of the main nests of tubes,
thus leaving a space for the combustion of any unconsumed gases-and these tubes
are so placed apart where connected to the upper chamber so as to admit of a clear
passage for the escaping products of combustion on way to the chimney.
Any of the tubes may be removed and replaced without any interference of the
casing of the boiler.
The fire grate is placed between the water chambers-and may be worked
ordinary chimney draft-or forced draft may be applied equally.
The whole of one or more such boilers, except the ends of the drums is encased
in brickwork-tiles,-iron-or any suitable casing-with or without non conducting
protection, and the waste products of combustion are led away in the usual
manner.
In order that my said invention may be fully understood and readily carried
into effect, I will now proceed to describe the drawings left with the Provisional
Specification.
EXPLANATION OF THE DRAWINGS.
Fig. 1, is a vertical section of the boiler in accordance with my invention.
Fig. 2, is a side elevation of the boiler with part of the casing removed.
In Figs. 1 & 2 A is the upper steam and water chamber-B is the lower or
water chambers, C are the tubes connecting the upper and lower chambers, as
shewn in full lines, d are similar rows of tubes as shewn in dotted lines, e are rows
of tubes on each side forming a close row or wall-the upper part of these tubes
are so placed apart to admit of a free passage of the products of combustion-the
upper part of these tubes above the water level of the boiler act as steam drying
or superheating surface-g is the casing consisting of one or more plates, with air
space, or any form of lagging which may be preferred-h is the fire grate which is
shewn placed between the lower chambers.

page_text: 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
A steam generator or boiler substantially as described-consisting of an upper
steam and water chamber, and two lower water chambers, and connected by a nest
of tubes on either side forming the main heating surface of the boiler-and a wall
of close tubes also on either side-the upper part of which acts as steam drying or
superheating surface, and so arranged at the upper part to admit a free passage
for the escaping products of combustion-aud I claim the above in connection with
a fire grate situated between the lower chambers-substantially as described, and
illustrated by the drawings left with the Provisional Specification.
Dated this 15th day of Sentember 1896
J. P. HALL.