MENTS IN APPARATUS FOR EFFECTING THE COMBUSTION OF FUEL AND THE CON- SUMPTION OR PREVENTION OF SMOKE, APPLICABLE TO BOILER FURNACES
Year: 1858

page_text: application for Letters Patent was not given within the time prescribed
by the Act.)
PROVISIONAL SPECIFICATION left by George Paterson at the Office of
the Commissioners of Patents, with his Petition, on the 29th March
1858.
I, GEORGE PATERSON, of Glasgow, in the County of Lanark, North Britain,
Engineer, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN APPARATUS FOR EFFECTING THE COMBUSTION OF FUEL AND THE CON-
SUMPTION OR PREVENTION OF SMOKE, APPLICABLE TO BOILER FURNACES," to be as
follows, that is to say:-
This Invention. relates to the so arranging the furnaces, flues, and ap-
pendages of steam boilers, that the combustion of fuel therein may be
effectively carried out, whilst the wasteful evolution of smoke is prevented.
According to one arrangement, where the boiler is cylindrical, with two parallel
internal flues, but with the furnaces disposed externally, the boiler is sur-
rounded with double storied brick flues, the two furnace doors being set in the
lower part of the brickwork at the front end; the fuel is thus supplied
through the lower section of the flues to reach the two furnaces, which are
fired alternately. The products of combustion from the newly charged furnace
pass away over a hollow or cellular brick bridge at the back of the grate, this
bridge being fitted with an adjustable air valve. From this point the current

page_text: passes along beneath the bottom of the boiler on that side, and then passes
laterally across by a passage formed at the after end of a central bottom water
space which forms the division of the furnaces and bottom flues; here it
reaches the bottom flue space on the opposite side, and it thence passes back
along that space over the bridge and into the other furnace, which is then in
a clear incandescent state, so that the combustible portions of the evolved
smoke are consumed to advantage; from this point the current passes
onwards through the lower section of the external brick flues, thus reaching
the internal boiler flue on that side, and passing along it to the back end of the
boiler; there it enters a cross end flue, which conveys it into an external
brick flue passing all round the boiler, and finally terminating in the chimney
duct. The two internal flues of the boiler have their after ends, which open
into the cross back end flue chamber, governed by a pendulous swinging valve,
having an upright weighted tumbling lever set on a stud in the boiler end,
and so arranged that it covers each flue end alternately. At the front of the
furnace are two cords or chains with handles, which pass back along each side
of the boiler round pulleys to reach the lever of the adjusting valve, so that
by pulling one or the other of these chains the engine attendant can at once
adjust the back valve, the result of each change being that the entire course
of the current herein-before described is reversed just as each furnace is
freshly fired. These arrangements are applicable under various forms; for
instance, in a boiler with a single internal fluc the adjusting valve for the
furnace currents is situated at the front end of the boiler, and is swung from
side to side to open and close lateral passages leading from one side to the
other.