IMPROVEMENTS IN STEAM BOILERS
Year: 1876

page_text: LETTERS PATENT to Thomas Russell, of the Firm of Hall, Russell, and
Company, of the City and County of Aberdeen, North Britain, Engineers and
Ship Builders, for the Invention of "IMPROVEMENTS IN STEAM BOILERS." A
communication from abroad by George Scott, of Calcutta, in the Empire of
India
ealed the 14th July 1876, and dated the 27th April 1876.
PROVISIONAL SPECIFICATION left by the said Thomas Russell at the Office
of the Commissioners of Patents on the 27th April 1876.
THOMAS RUSSELL, of the Firm of Hall, Russell, and Company, of the City and
County of Aberdeen, North Britain, Engineers and Ship Builders.
"
IMPROVE-
MENTS IN STEAM BOILERS." A communication from abroad by George Scott, of
Calcutta, in the Empire of India.
This Invention, which relates to improvements in boilers, is applicable either to
land or marine boilers using muddy or dirty water.
The Invention has for its object to prevent or lessen the incrustation or deposit
on the heating surface of boilers of the mud or dirt which passes in with the feed
water and remains in the boiler after the water is evaporated or converted into
steam.
The boiler, as constructed in accordance with this Invention, consists of one or
more cylindrical or tubular steam generators fitted internally with tubes for the
passage of the products of combustion. At the lower part each generator is pro-
vided with a deep vertical hollow leg or member extending throughout its entire
length or through a part of the length thereof, and on each side of these legs the
furnaces are placed, the fire-bars of the said furnaces being situated at a level above
the lower ends of the hollow legs or members. By means of this arrangement the mud
or dirt passing into the boiler with the feed water settles down to the bottom of the
hollow legs, that is to say, below the level of the fire-bars, where being beneath the
heating surface its accumulation can do no harm. The accumulated mud or dirt
may from time to time be removed by opening the blow-off cocks of the boiler, or
by scrapers, or other equivalent means.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Thomas Russell in the Great Seal Patent Office on the 26th
October 1876.
THOMAS RUSSELL, of the Firm of Hall, Russell, and Company, of the City and
County of Aberdeen, North Britain, Engineers and Ship Builders. "IMPROVEMENTS
IN STEAM BOILERS." A communication from abroad by George Scott, of Calcutta,
in the Empire of India.
This Invention, which relates to improvements in boilers, is applicable either to
land or marine boilers using muddy or dirty water.
The Invention has for its object to prevent or lessen the incrustation or deposit
on the heating surface of boilers of the mud or dirt which passes in with the feed
water and remains in the boiler after the water is evaporated or converted into
steam.
The boiler constructed in accordance with this Invention consists, as seen in
longitudinal section at Figure 1 and in part transverse section and part end
elevation at Figure 2 of the appended Drawings, of four cylindrical or tubular
steam generators A, fitted internally with tubes B for the passage to the uptake
of the products of combustion from the combustion chambers communicating with
the inner ends of the furnaces or fire-grates C. At the lower part each generator
is provided with a deep vertical hollow leg or member D extending throughout its
entire length, or through a part of the length thereof, and on each side of these
legs the furnaces C are placed, the fire-bars of the said furnaces being situated at a
level above the lower ends of the hollow legs or members, which may be of any
desired depth and breadth, according to the circumstances under which the boiler is
to be employed. By means of this arrangement the mud or dirt passing into the
boiler with the feed water settles down to the bottom of the hollow legs, that is to
say, below the level of the fire-bars, where, being beneath the heating surface, there
is less danger of the boiler burning, and consequently lessened risk of explosion.
The accumulated mud or dirt may, from time to time, be removed by opening the
blow-off cocks of the boiler, these being placed on the hollow legs or members D, or
the mud may be removed by scrapers or other equivalent means.
Instead of employing four generators A, as seen on the Drawings, any other
desired number may be used, these being either situated in parallel rows divided
transversely through the centre by the wall F, or otherwise suitably arranged, and
by placing the fire-grates underneath and between the generators a large amount of
heating surface is derived from the external shell of the boiler, which, in ordinary
multitubular boilers, is not available. This arrangement also permits the space
at the interior of the boiler generally occupied by the furnaces to be filled with
tubes, thus also giving a greater internal heating surface than is obtained in a
multitubular boiler of similar diameter as hitherto constructed.
Having now described and particularly ascertained the nature of the said
Invention, as communicated to me by my foreign correspondent, I would observe
in conclusion that what is considered to be novel and original, and therefore claimed
as the Invention secured to me by the herein-before in part recited Letters Patent is,
the improved steam boiler herein-before described and shewn on the appended
Drawings, constructed with deep vertical hollow legs or members extending through-
out its entire length or a portion thereof, and projecting below the fire-grates, sub-
stantially as and for the purposes set forth.
In witness whereof, I, the said Thomas Russell, have hereunto set my hand
and seal, this Fourteenth day of October One thousand eight hundred and
seventy-six.
THOMAS RUSSELL. (L.S.)