Improvements in Water-tube Steam Generators.
Year: 1898

page_text: Date of Application, 22nd Sept., 1898
Complete Specification Left, 24th July, 1899-Accepted, 9th Sept.,
1899
[Communicated from abroad by WILLIAM R. GRAFTON, of Alexandria, Egypt,
Engineer.]
Improvements in Water-tube Steam Generators.
I, HENRY GRAFTON, of Wardrobe Chambers, Queen Victoria Street, in the
City of London, Engineer, do hereby declare the nature of this invention to be
as follows:-
The invention relates to improvements in water tube steam generators and
has for its object to facilitate circulation of the water, and consists essentially in
making the tubes as near as may be complete cycles so that the momentum
attained by the water in passing through the tubes may be conserved.
The tubes proper are preferably bent in the form of a broken hoop but may
depart from a true circle in form, but in all cases will have easy curves of the one
order.
Such tubes will have their ends fixed at a suitable distance apart into a
reservoir for steam and water from which the tubes will depend.
33
suit-
The tubes may be bent into hoops of various diameters arranged in any
able manner and with the "gap in any suitable angular position in the plane
of the hoop.
Dated this 22nd day of September 1898.
COMPLETE SPECIFICATION.
Improvements in Water-tube Steam Generators.
I, HENRY GRAFTON, of Wardrobe Chambers, Queen Victoria Street, in the
City of London, 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: -
This invention relates to improvements in water-tube steam generators and
has for its object to facilitate circulation of the water, and consists essentially
in making the tubes, as near as may be, complete cycles, the tubes being in
the form of broken hoops. The tubes may however depart from a true circle
in form, but in all cases will have easy curves of the one order of direction.
Such tubes will have their ends fixed at different levels at a suitable distance
apart into a reservoir for steam and water, from which the tubes will depend.
The invention is illustrated in the accompanying drawings forming part of

page_text: this specification wherein Figure 1 is a part front and part sectional elevation;
and Figure 2 a part side and part sectional elevation of the improved water
tube boiler.
A is the drum and B B are nests of tubes bent to circular or nearly circular
form, that is to say to a constant or nearly constant curvature, each tube com-
prising about three-fourths of the circle and being fixed by its ends in the drum
at different levels so as to determine a vigorous circulation through the tubes in
the direction of the arrows. Each nest comprises a number of series or rows of
tubes of different diameters of curvature, placed the one row or series within the
other as shewn, the tubes of adjacent rows being staggered with regard to each
other. The rows of tubes are shewn as being placed eccentrically within each other
and as made of tubing of uniform diameter, but the rows might be concentric and
the tubing of different diameters. The casing C in which this drum and tubes are
enclosed is lined with firebrick at D.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:
A water-tube steam boiler consisting of a drum having nests of water-tubes
of circular, or nearly circular, curvature set therein each nest comprising cir-
cumjacent series of tubes substantially as shewn and described.
Dated this 24th day of July 1899
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.