IMPROVEMENTS
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by the said Andrew Gibb at the Office
of the Commissioners of Patents on the 1st February 1882.
ANDREW GIBB of Greenwich in the County of Kent.
MARINE BOILERS,"
"IMPROVEMENTS IN
My Invention relates to marine boilers and it has for its object to utilise the waste
heat of the products of combustion for heating the bottom or sides of the boiler in
order thereby to promote a better circulation of the water, cause equal expansion,
prevent corrosion and enable steam to be got up more rapidly without injury to
the boiler.
"
In carrying out my Invention, instead of connecting the smoke box into which
the return tubes lead, directly with the uptake as is usual, I connect it with one
or more legs or vertical flues leading downwards into a horizontal fluo extending
beneath the whole bottom of the boiler between the stools on which it rests and
communicating directly or indirectly with the uptake. There may be such a leg
or flue at each side of the front of the boiler, but in the case of two or more boilers
arranged side by side, it is preferred to have one such leg or flue for the two
boilers. The smoke boxes project from the fronts of the boilers in the ordinary
way and connect with the leg or vertical flue which may also project from the
boiler fronts and would be situated midway between them and lead into the
horizontal flue or flues just above the stoke hole plate. The flue or flues beneath
the boilers may be enclosed at the front by the ordinary fender plates and by
plates fixed to the stools on which the boiler rests, and by suitable plates at the
back end and may communicate with the uptake between the boilers, or by flues
extending up the back ends of the boilers or otherwise arranged according to
circumstances. Baffle plates would be arranged in the flues beneath the boilers to
prevent the gases passing directly to the uptake and ensure as uniform a distribution
of the heat as possible.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Andrew Gibb in the Great Seal Patent Office on the 1st August
1882.
ANDREW GIBB of Greenwich in the County of Kent. " IMPROVEMENTS IN
MARINE BOILERS."
My Invention relates to marine boilers and it has for its object to utilise the
waste heat of the products of combustion for heating the bottom, sides, or back of
the boiler in order thereby to promote a better circulation of the water, cause
equal expansion, prevent corrosion, and enable steam to be got up more rapidly
without injury to the boiler.
In carrying out my Invention, instead of connecting the smoke box into which
the return tubes lead, directly with the uptake as is usual, I connect it with one
or more legs or downtakes leading downwards into a horizontal flue extending
beneath the whole bottom of the boiler between the stools on which it rests and
communicating directly or indirectly with the uptake. There may be such a leg
or flue at each side of the front of the boiler, but in the case of two or more boilers
arranged side by side, it is preferred to have one such leg or flue for the two
boilers. The smoke boxes project from the fronts of the boilers in the ordinary
way, or they can be arranged to be flush with the front of the boiler and connect
with the leg or vertical flue which may also project from the boiler fronts and
would be situated midway between them and lead into the horizontal flue or flues.
The flue or flues beneath the boilers may be enclosed at the front by the ordinary
fender plates and by plates fixed to the stools on which the boiler rests, and by
suitable plates at the back end and may communicate with the uptake between
the boilers, or by flues extending up the back ends of the boilers or otherwise
arranged according to circumstances. Baffle plates would, be arranged in the flues
beneath the boilers to prevent the gases passing directly to the uptake and ensure
as uniform a distribution of the heat as possible.
Figure 1 is a front elevation of a set of two marine boilers (part of the fender
plates being removed). Figure 2 is a plan, and Figure 3 a side elevation of the
same.
A is the smoke box extending across the fronts of the two boilers B B. C are
legs or vertical flues leading down in front of the boilers between and at either
side. These vertical flues C lead down towards the underside of boilers into a
horizontal flue D formed by enclosing the space between the bottoms of the boilers
and the ship's floor by means of plates & at the sides rivetted to the stools E
and other plates d' at the back. In the case of a pair of boilers as herein repre-
sented, the flue D extends beneath both boilers and the space between them, the
plates & being at the extreme outer sides only. F is the uptake situated over the
space between the boilers, and G is an inclined baffle plate extending upwards
between the boilers and for a sufficient distance beneath each boiler to cause the
gases to circulate in the flue D before passing to the uptake, as indicated by
the arrows. Instead of a vertical flue between the boilers leading to the uptake,
there might be a vertical flue at the back ends of the boilers, or at one side in the
case of a single boiler, leading to the uptake, according to the position of the latter
and the other circumstances of the case.
Having described the nature of my Invention for "Improvements in Marine
Boilers" and the manner of performing the same, I declare that what I claim as

page_text: my Invention to be protected by the hereinbefore in part recited Letters
Patent is
The construction of a boiler or boilors of the return flue or marine type with a
horizontal flue or flues extending beneath the same and communicating with the
uptake, and with upright flues connecting the smoke box with said horizontal flue
or flues, all substantially as shown and described.