IMPROVEMENTS IN CHARGING FURNACES AND IN THE CONSTRUCTION OP FURNACES AND OF STEAM BOILERS
Year: 1872

page_text: PROVISIONAL SPECIFICATION left by Peter Jensen at the Office of
the Commissioners of Patents, with his Petition, on the 4th July
1872. A communication from abroad by Anker Heegaard, of
Copenhagen, in the Kingdom of Denmark, Engineer.
I, PETER JENSEN, of 89, Ohancery Lane, in the County of Middlesex,
Engineer and Patent Agent, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN CHARGING FURNACES AND IN THE CONSTRUCTION
OP FURNACES AND OF STEAM BOILERS," (a communication to me from abroad
by Anker Heegaard, of Copenhagen, in the Kingdom of Denmark,
Engineer,) to be as follows:-
The primary objects of this Invention are to retain a high and
constant temperature in the furnaces for such steam boilers to which
this Invention is applicable, and also to prevent the formation of smoke.
For this purpose the furnace is made of a much greater width than
usual, the length or depth of it being shortened correspondingly.
Secondly. Instead of one or two firing doors, a comparatively great
number of them, say eight, are arranged side by side. The doors are
flaps hanging in joints in box-like mouths, through which coals are

page_text: supplied at suitable and quite regular intervals, which are regulated
by means of an alarum clock so constructed as to give the signal to the
fireman, say every 2 or 3 minutes. The firing is also done in a regular
order, by preference as follows:-Through the first, third, fifth, and
seventh; then the second, fourth, sixth, and eighth fire-door. The
firing shovel is similar to those used with coal scuttles for ordinary
domestic fires, but fitted with a long handle having a loose shield or
disc of the size of the opening of the firing mouths. The shovel is as
long as the depths of the grate, and when fully inserted through the
flap fire-doors it is turned, thereby discharging its contents evenly over
that part of the grate, the loose shield at the same time preventing cold
air from entering.
To vary the supply, as required, shovels of two or more sizes may
be used. Air is supplied behind the grate either by ordinary well-
known means, such as the "split bridge" or, by preference, by means of 1
a hollow iron bridge lined with fire-brick in front and having deflectors
inside to lengthen the passage of the air to heat it partially before
escaping through holes at the top; the air admission is regulated by
dampers.
The next object of this Invention is the construction of a steam boiler
most suitable for this kind of furnace. It consists of two or more
systems or layers of water tubes slanting more or less or horizontal, by
preference, of wrought iron 5 to 9 inches in diameter. They may be so
proportioned that each set or unit of them evaporates one cubic foot of
water per hour, equal to one horse power. The corresponding tubes in
each system of tubes are connected in front and behind by straight pipes
and by elbows respectively; the latter again being joined by horizontal pipe
connections. The spaces between the pipes are so covered by tiles as
to form proper flues for the flame and heat to pass along and act on the
tubes. The tubes in the upper system of tubes have each a T piece
which is in connection with a steam drum or chamber; all the tubes
have doors in front for cleaning.