IMPROVEMENTS IN STEAM GENERATORS AND IN APPARATUS CONNECTED THEREWITH
Year: 1874

page_text: LETTERS PATENT to William Mather, of the Salford Ironworks,
Salford, in the County of Lancaster, Engineer, and James Dodge,
of Eccles, in the same County, Engineer, for the Invention of
"IMPROVEMENTS IN STEAM GENERATORS AND IN APPARATUS CONNECTED
THEREWITH."
Scaled the 21st August 1874, and dated the 10th June 1874.
PROVISIONAL SPECIFICATION left by the said William Mather and
.
James Dodge at the Office of the Commissioners of Patents, with
their Petition, on the 10th June 1874.*
WC, WILLIAM MATHER, of the Salford Ironworks, Salford, in the
County of Lancaster, Engineer, and JAMES DODGE, of Eccles, in the
same County, Engineer, do hereby declare the nature of the said In-
vention for "IMPROVEMENTS IN STEAM GENERATORS AND IN APPARATUS CONNECTED
THEREWITH," to be as follows:-
Our Invention relates to the arrangement of the parts forming an
improved steam generator, also to the apparatus for superheating steam
and for cleaning the tubes of steam boilers.

page_text: Our improved steam generator consists, by preference, of five com-
partments, but the number may be varied. The upper compartments
contain water and steam, and are provided with steam domes, water
gauges, and safety valves. The intermediate compartments contain
water, and the lowest compartment, which is multitubular, also contains
water. The fire-grate is placed under one end of the upper com-
partments, and the products of combustion pass though a flue under
and around the upper compartments, then back through another flue or
flues containing the intermediate compartments, and then back again
partly through the tubes and partly. under the multitubular compart-
ment, and thence to the chimney. The feed water is supplied to the
end near the chimney of the multitubular compartment and gradually
ascends through the various compartments, which are all united
by junction pipes. The tubes are or may be only placed.in the
upper part of the multitubular compartment to give a space for the
water below to deposit.the sediment as it is gradually heated, and to
enable the interior to be cleaned out when required, access being had
through a man-hole. Any incrustation on the exterior of the tubes can
'also be cleaned at the same time by a hand scraper; or a self-acting
'scraper consisting of a plate with scrapers attached may be traversed
slowly to and fro over the tubes by a rod passing through a stuffing box
and actuated by a nut in the plate and a screw on the rod, or
otherwise. The soot is removed from the interior of the tubes by spiral
blades of steel or other metal, which in revolving draw the soot to one
end of the tubes, from which it falls into a suitable receiver. This
mode of cleaning the interior of the tubes renders the multitubular
apparatus forming part of the boiler capable of extracting all the heat,
which can be made available before the products of combustion pass to
the chimney.
The apparatus for superheating the steam is based upon the apparatus
described in the Specification of. Letters Patent granted to the within-
named James Dodge on the 21st Nov. 1871, No. 3147, and it consists
* of a series of pipes connected to the upper part of the boiler, and these
pipes are placed in a flue connected to the uppermost flue by two
dampers, the position of which can be varied to regulate the heat applied
to the superheating pipes. The steam before entering these pipes must
pass through back pressure valves to prevent it returning to the
boiler.

page_text: The arrangement of the flues and the dampers for regulating the
draught through them can be varied.
TO ALL TO WHOM THESE PRESENTS SHALL COME, wc, WILLIAM
MATHER, of the Salford Ironworks, Salford, in the County of Lancaster,
Engineer, and JAMES DODGE, of Eccles, in the same County, Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the. Tenth day of June, in the year of our
Lord One thousand eight hundred and seventy-four, in the thirty-.
seventh year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto us, the said William Mather and James Dodge, Her
special licence that we, the said William Mather and James Dodge,
our executors, administrators, and assigns, or such others as we, the said
William Mather and James Dodge, our executors, administrators, and
assigns, should at any time agree with and no others, from time to
time and at all times thereafter during the term therein expressed, should
and lawfully might make, use, exercise, and vend, within the United
Kingdom of Great Britain and Ireland, the Channel Islands, and Isle of
Man, an Invention for "IMPROVEMENTS IN STEAM GENERATORS AND IN
APPARATUS CONNECTED THEREWITH," upon the condition (amongst others)
that we, the said William Mather and James Dodge, our executors or
administrators, by an instrument in writing under our, or their, or
one of our or their hands and seals, should particularly describe and
ascertain the nature of the said Invention, and in what manner the
same was to be performed, and cause the same to be filed in the Great
Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent. :
.

page_text: what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement. (that is to say) :-
Our Invention consists in an improved arrangement of the parts.
forming a steam generator, in the apparatus for superheating steam and.
for cleaning the tubes of steam boilers.
And in order that our Invention may be fully understood and readily
carried into operation we will proceed to describe the accompanying
Sheet of Drawings, reference being had to the figures and letters
marked thereon.
Fig. 1 is a transverse section, and Fig. 2 a longitudinal section of our
improved steam generator; Fig. 3 is an end view, and Figs. 4, 5, and 6,
are detached portions of the same.
Our improved steam generator consists, by preference, of five com-
partments, but the number may be varied. The upper compartments
marked a, a, contain water and steam, and are provided with the steam
dome 6 and with water guages and safety valves as usual. The inter-
mediate compartments c, c, contain water, and the lowest compartment d,
which is multitubular, also contains water. The compartments a and c
are connected by the junction pipes e, and the compartments c and d
are connected by the elbow junction pipe f. The fire-grate g is placed
under one end of the upper compartments a, a, and the products of
combustion pass through a flue under and around the upper compart-
ments a, a, then back through another flue or flucs containing the
intermediate compartments c, c, and then back again, partly through
the tubes d¹ of and partly under the multitubular compartment d, and
thence to the chimney. By placing the mulțitubular apparatus at a
point remote from the furnace the heat is applied in the most favorable
manner for the generating of steam as the products of combustion are
made to come into contact with the extended heating surfaces as their
temperature decreases, thus gradually enabling the water to absorb the
heat as it ascends towards the furnace in the upper part of the boiler
where steam is formed. The application of the multitubular apparatus
in either horizontal or vertical, or other position, would thus render any
form of boiler an improved steam generator. The damper d² at the end
of the compartment d can be opened or closed by the handle ³, clbow
lever d, and rod ³, so as to regulate the passage of the products of

page_text: combustion through the tubes d', and through the flue. The feed
water is supplied through the pipe h, see Fig. 1, to the end near the
chimney of the multitubular compartment d. The blow-off pipe i is
also connected to the lower end of the compartment d. The tubes (
are placed, by preference, only in the upper part of the multitubular
compartment & to give a space for the water below to deposit the sediment
as it is gradually heated, and to enable the interior to be cleaned out
when required, access being had through a man-hole. The incrustation
on the exterior of the tubes d' can also be cleaned at the same time by a
hand scraper; or a self-acting scraper consisting of a plate with scrapers
attached may be traversed slowly to and fro over the tubes d', by a rod
passing through a stuffing box and actuated by a nut in the plate. and a
screw on the rod or otherwise. The soot is removed from the interior of
the tubes d¹ by means of the spiral coils of steel or other wire j, as
shewn in Fig. 5, or by spiral blades of steel or other metal k, as shewn
in Fig. 6, which, in revolving draw the soot to one end of the tube,
from which it falls into a suitable receiver or into the bottom flue, as
shewn in Fig. 2. This mode of cleaning the interior of the tubes renders
the multitubular apparatus forming part of the boiler capable of
extracting all the heat which can be made available before the products
of combustion pass to the chimney. The slow rotary motion is imparted
to the spiral coils or blades j and by the worms gearing into pinions
fixed to the axles of the coils or blades, as shewn in Figs. 2 and 4, or in
any other convenient manner.
The apparatus for superheating the steam is based upon the apparatus
described in the Specification of Letters Patent granted to the within-
named James Dodge on the 21st day of November, 1871, Number 3147,
and it consists of a series of pipes marked 7 connected to the steam dome
placed on the upper part of the compartments a, a, and these pipes are
placed in the fluc m connected to the uppermost flue of the boiler by
two dampers p, p, the position of which can be varied by the handles p¹
to regulate the heat applied to the superheating pipes. It is evident
that when the dampers are both down, as shewn in Fig. 2, the products
of combustion are excluded from the fluc m, and consequently the
superheating of the steam would not take place. When that is the case
the valve n is closed and the steam taken off at o, but when the danipers
are open the valve n is opened, and the steam, after circulating through
the pipes 7, is taken off at q. The steam, before entering the super-