Year: 1899

page_text: Date of Application, 11th Nov., 1899-Accepted, 13th Jan., 1900
I, DAVID MACDONALD, of 7, White Street, Partick, Glasgow, Chief Clerk, do
hereby declare the nature of this invention and in what manner tlie same is to he
performed, to be particularly described and ascertained in and by the following
statement:.
This invention relates to steam generators and it is a development of the
steam generator described in the Specification of my prior Patent No. 26273.
of 1897.
In order that my invention may be properly understood I have hereunto
appended two explanatory sheets of drawings which show, by way of example,
a marine boiler constructed in accordance with my invention.
On the drawings:-
Fig. 1 is an end elevation of the marine boiler.
Fig. 2 is a longitudinal section of the same.
Fig. is a sectional plan taken on the line X-X Fig. 1.
The details of construction of the boiler are the same as at present and are
therefore not shown on the drawings.
The boiler is constructed as before in three parts one constituting the steami
chamber a, one the water chambor b, and one an intermediate water tube space c.
In the present invention fire tubes are not arranged within the water chamber.
As will be seen the base part of the generator constitutes a boiler of semi-
cylindrical shape with three furnaces g,,, which may be of any suitable and
well known construction and the usual man-hole and sludge holes h, h¹³. The
upper part of the generator a constitutes a separate semicylindrical steam cham-
ber having a flat bottom. The intermediate space between the chambers a
and is traversed by vertical water tubes and e which are arranged in groups,
as shown clearly at Fig. 3, and which connect together the chambers a and b
Each group consists of two parallel rows of large water tubes d and two parallel
rows of small water tubes e arranged between the rows of tubes d. Between the
groups of water tubes d, e, are spaces in which rows of portable compression
resisting columns f may be arranged. These columns extend from side to side
of the boiler and are arranged at suitable intervals apart from one another.
They are flanged at each end and arc, preferably, made of cast iron and are
merely inserted or wedged in place so that they can be rendily removed when
required in order to give access to the space between the groups of water tubes
for cleaning, repairing and other purposes.
The space in which the vertical water tubes are arranged is closed in at the
sides by the plates j, j, but is open at each end.
The vertical water tubes pass through the flat plates constituting respectively
the bottom of the chamber a and the top of the chamber b and are secured at
cach end in any usual and well known manner.
The tubes d may be provided with portable lengthening pieces in order
to raise their upper ends above the water level.

page_text: is the up-take to the funnel. k is the back up-take. is a bridge plate which
may be fitted at the end of the water tube space if so desired.
Strengthening stays can be arranged wherever necessary.
The boiler is provided with all the usual fittings.
At
If so desired Galloway or cross tubes may be arranged in the furnaces g.
the back of the boiler, if so desired, two or more water circulating tubes may be
arranged, the same as in my prior invention, the tubes communicating at their
upper ends with the bottom of the steam chamber a and at their lower ends
with the bottom of the water chamber b.
With this construction of generator the hot gases of combustion pass from
the furnaces into the up-take and then upwards into the space c around and
between the water tubes and finally over the bridge to the funnel or flue.
The invention can be applied to land as well as marine boilers.
Having now particularly described and ascertained the nature of my said
invention and in what manner.the same is to be porformed, I declare that what
I consider novel and desire to claim is:
I
1. A steam generator comprising a water chamber, a steam chamber and an
intermediate space in which groups of water tubes are arranged all substan-
tially as herein before described with reference to the drawings annexed.
2. A steam generator comprising a water chamber, à steain chamber and an
intermediate space in which groups of water tubes are arranged and compression
resisting columns inserted in the spaces between the groups of water tubes all
substantially as herein before described with. reference to the drawings annexed.
Dated this 10th day of November 1899.
H. D. FITZPATRICK,
100, Wellington Street, Glasgow, Agent.