An Improvement in Water Tube Boilers.
Year: 1897

page_text: Date of Application, 9th Oct., 1897
Complete Specification Left, 7th July, 1898-Accepted, 3rd Sept., 1898
PROVISIONAL SPECIFICATION.
An Improvement in Water Tube Boilers.
I, JOHN GIBB DUNLOP, of The Clydebank Engineering and Shipbuilding
Company Limited, Clydebank, in the County of Dumbarton, Engineer, do
hereby declare the nature of this invention to be as follows:-
My invention relates to boilers of the kind which have water chambers below
from which rows of small tubes ascend to steam and water chambers above,
which communicate with the water chambers by down flow pipes, so that hot
products of combustion from a fire or fires in the middle of the boiler, when
they pass through between the small tubes cause a rapid circulation of water
and generation of steam.
The object of my invention is to ensure more complete combustion of the fuel
gases, and to direct the hot products more thoroughly among and against the
tubes
For this purpose, I form as it were walls of tubes, in the known manner, by
making parts of the rows consist of tubes close together so as to give no passage
between them and I thus cause the gases to take a more or less zigzag course
on their way to the uptake or chimney.
In suitable parts of their course I form combustion chambers, by omitting
groups of the tubes, so that the gases in these chambers are free to thoroughly
mingle with each other and with such air as accompanies them or with additional
air which may be admitted to the chambers. In this manner complete com-
bustion is ensured and the hot products are directed freely between and among
the tubes.
A
1007
ABEL & IMRAY,
Agents for the Applicant.
444
I, JOHN GIBB DUNLOP, of The Clydebank Engineering and Shipbuilding
Company Limited, Clydebank, in the County of Dumbarton, 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 follow-
ing statement:-
My invention relates to boilers of the kind which have water chambers below
from which rows of small tubes ascend to steam and water chambers above,

page_text: which communicate with the water chambers by down flow pipes so that hot
products of combustion from a fire or fires in the middle of the boiler, when
they pass through between the small tubes cause a rapid circulation of water
and generation of steam.
The object of my invention is to ensure more complete combustion of the fuel
gases, and to direct the hot products more thoroughly among and against the
tubes
For this purpose I arrange the tubes as I shall describe referring to the
accompanying drawings. Fig. 1 is a longitudinal section and Fig. 2 is a
sectional plan of one arrangement according to my invention; Figs. 3. and
are corresponding views of a modified arrangement.
4
For this purpose I form as it were walls W of tubes, in the known manner
by making parts of the rows consist of tubes close together so as to give no
passage between them, and I thus cause the gases to take a more or less zig-zag
course on their way to the uptake or chimney as indicated by the arrows.
In suitable parts of their course I form combustion chambers C by omitting
groups of the tubes, so that the gases in these chambers are free to thoroughly
mingle with each other. and with such air as accompanies them, or with
additional air which may be admitted to these chambers. In this manner com-
plete combustion is ensured and the hot products are directed freely between
and among the tubes.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
I claim is:
A water tube boiler having its tubes arranged to form walls, deflecting the
combustion gas, and to form chambers for their more complete combustion, sub-
stantially as described with reference to the drawings.
Dated this 7th day of July 1898.
ABEL & IMRAY,
Agents for the Applicant."