Improvements in Steam-boilers.
Year: 1899

page_text: Date of Application, 22nd Dec., 1899-Accepted, 10th Feb., 1900
COMPLETE SPECIFICATION.
Improvements in Steam-boilers.
1, FREDERICK WILLIAM GOLBY, of 36, Chancery Lane, in the County of Middle-
sex, Patent Agent, do hereby declare the nature of this invention and in what
manner the same is to be performed, as communicated to me by Johann Schütte,
of 79, Deichstrasse Bremerhaven, Germany, Engineer; to be particularly de-
scribed and ascertained in and by the following statement:-
In comparison with ordinary marine boilers, water tube-boilers have the ad-
vantage of smaller weight and of generating steam more rapidly therefore they
are employed in the navies of the different States, on the other hand they have
the disadvantages of consuming about 26 per cent. more coal and of being more
subject to repairs, therefore they are not employed in the mercantile navy.
The object of the present invention is to provide a boiler which combines the
advantages of both the cylindrical and the water tube boilers.
To this end the boiler must fulfil the following conditions;
(1) It must have a smaller weight and water space than a cylindrical boiler of
the same heating surface.
(2) As is the case in a locomotive or cylindrical boiler the flames, which are
produced in different grates, must unite in a large space in the combustion
chamber and then be divided into hundreds of parts, whereby the coal and the
heating gases therefrom can alone be thoroughly and effectively consumed.
(3) It must be readily accessible and easy to clean, without the necessity of so
many parts being loosened.
(4) It must have a very large heating surface in comparison with the volume
of water to be evaporated, but not so large, however, that there is a difficulty
connected with the feeding of the boiler; and, finally;
(5) It must not have larger dimensions than a cylindrical boiler of similar
heating surface.
These points have been considered in the construction of the boiler which forms
the subject of this invention and which is represented in the accompanying
drawings;
Fig. 1 being a front elevation of the same, partly in section.
Fig. 2 a transverse section, and
Fig. 3 a plan partly in section.
The boiler consists of two steam collectors 9 and each connected almost
throughout its length, with a flat water reservoir a which latter are connected
together by a central part or intermediate boiler o.
The water reservoirs a and the central part o of the boiler are traversed by a
number of fire-tubes b, which carry off the heating gases, conveyed into the com-
bustion chamber n from the fire grates m to the front smoke chamber and the
chimney c.

page_text: In order that the. under part of the intermediate boiler may be protected
against the flames, and nevertheless a large heating surface obtained, it is con-
nected by means of water heating tubes s, with longitudinal water drums i and k
these water tubes s effecting a rapid production of steam, and an immediate cir-
culation of the water.
The water heating tubes t, which limit or bound the combustion chamber n,
connect the steam collector 9 and the transverse water drum l, and act to effect a
rapid production of steam in the same manner as the water tubes s.
Sheet metal supports e furnished with longitudinal 'slots' f serve as 'internal
stays.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
claim is:-
A combined fire-tube and water-tube boiler, the distinguishing feature of which
is that the heating gases developed in the fire grates, are produced in a space
which is shut off at the top and at the side by water heating tubes and longitudinal
water drums the heating gases reaching a common combustion chamber which is
formed on the outside by transverse water drums, and water heating tubes which
connect said transverse drums with a collector, the heating gases being conveyed
from the combustion chamber through fire-tubes, to the chimneys, substantially
as described.
Dated this 92nd day of Dogambar 1800
4.7
F. W. GOLBY,
Patent Agent, 36, Chancery Lane, London, W.C.