AN IMPROVED STEAM-GENERATOR OR WATER HEATER
Year: 1883

page_text: LETTERS PATENT to Horbert John Haddan, of Kensington, Middlesex for an
Invention of AN IMPROVED STEAM-GENERATOR OR WATER HEATER a com-
munication to him from abroad by Jean Marie Henri Menay, of Havre,
France
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at the
Office of the Commissioners of Patents on the 22nd June 1883.
"J
HERBERT JOHN HADDAN, of Kensington, Middlesex, "AN IMPROVED STEAM-
GENERATOR OR WATER-HEATER," a communication to me from abroad by Jean
Marie Henri Menay, of Havre, France,
This invention relates more particularly to water-tube boilers, and has for its
principal object to establish a constant circulation of water and avoid the formation
of scales.
For this purpose I compose the boiler of an ordinary cylindrical shell serving as
water and steam reservoir and two systems of tubes, communicating with the
reservoir, each water tube of one system enclosing a tube of the other system.
The inner tubes communicate at one (upper) end with the water space of the
boiler and allow the water to escape at the other (lower) end into the outer tube,
which is in contact with the hot gases of combustion, and allows the steam or hot
water genorated therein to escape on the side where the water enters the inner
tube (upper end of the tube). A pipe is placed at the bottom of the water reservoir
for discharging the mud deposited therein; the said pipe extending outside tho
boiler where it is provided with a mud-cock.
The tubes are preferably placed in an inclined position above the grate and
below the reservoir. The outer pipes are secured at the open (upper) end to a tube-
plate by screw joints or in any other suitable manner, while the upper ends of the
inner tubes are secured to a partition or plate placed outside the said tube plate
and forming with the tube plate and its attachments two chambers, one of which
communicates with the steam-space of the reservoir, while the other communicates
with the water-space.
The same type of boiler may also be used for producing hot water instead of
steam,

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Herbert John Haddan in the Great Seal Patent Office on the
21st December 1883.
HERBERT JOHN HADDAN, of Kensington, Middlesex, "AN IMPROVED STEAM-
GENERATOR OR WATER-HEATER," a communication to me from abroad by Jean
Marie Henry Menay, of Havre, France,
This invention relates more particularly to water-tube boilers, and has for its
principal object to establish a constant circulation of water and avoid the formation
of scales.
In describing this invention reference will be made to the annexed drawings of
which Fig. 1 is a longitudinal section, and Fig. 2 half a front elevation and half a
cross section of a boiler. embodying this invention.
A represents a group of steam tubes. Ba group of circulating tubes, Ca box
connecting the two groups of tubes, D.a partition or plate holding the circulating
tubes, E a removable door for inspecting replacing and cleaning the tubes, F water
and steam reservoir, superheater, H reservoir receiving the deposits of the
circulating water, I metallic walls forming a water reservoir, J heating tubes acted
upon by the flames and connecting the two walls I, K door for the inspection of
the rear part, L support connecting the reservoir formed by the walls I with the
reservoir , M partitions serving to deflect the gases during their passage from
the grate to the chimney, N pipe for conducting steam from the reservoir to the
superheater, O steam supply pipe of the engine, P plate serving to hold the tubes,
Qfeed water pipe.
The improved boiler is chiefly applicable as a marine boiler. The group of tubes
as well as the water and steam-reservoir- are surrounded by the metallic walls I
which are internally connected by means of the cylindrical heating tubes J. This-
new arrangement has the advantage of combining a great heating surface with a
Jarge quantity of water in a tubular boiler
The walls I may be composed of a series of vertical tubes terminating at the top
in a rectangular box receiving the steam bubbles and serving as a support for the
tubes L leading to the reservoir F. This arrangement has equally the advantage
of increasing the heating surface of the metallic walls, while the stays required for
holding flat plates, may be omitted.
The boiler may be cleaned by means of a metal scraper through suitable
apertures, or by forcing a jet of steam through a tube perforated over the whole of
its surface and placed in the centre of the group of tubes; or through a door K
situated at the rear of the apparatus.
It is evident, that the shape and arrangement of the different parts and the
materials from which they are constructed may be varied without departing from
the invention.
What I claim is :
The arrangement of the metallic walls I provided with cross stays as described,
and the reservoir F in combination with heating tubes, substantially as described.
In Witness whereof I, the said Herbert John Haddan have hercunto set my
hand and seal this 21 day of December AD 1883.