ROVEMENT
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by Frederick Siemens at the Office of
the Commissioners of Patents on the 8th September 1882.
FREDERICK SIEMENS of Dresden in the Kingdom of Saxony
IN LAMPS"
"IMPROVEMENTS
My improvements relate to that construction of lamps wherein the heat of the
products of combustion is imparted more or less to the air and gas supply for the
flame, for which construction I have obtained previous Letters Patent N° 2231
of 1879, N° 1561 of 1880, N° 5172 of 1880 and N° 2638 of 1881.
In the constructions of lamps described in the Specifications to these Patents
notched air deflectors were applied both outside the ring of tubes forming the
burner, at the level of the tops thereof, and inside the ring of tubes at some
distance above the tops thereof, and above the inner air deflector was provided a
cylinder of porcelain forming a continuation of the central flue of the burner, so
that the flame rose up to some height above the said air deflectors and then
turned over the upper edge of the said cylinder, being drawn down into the same
by the draught.
According to my present improvements I dispense with the said cylinder of
porcelain and notched air deflectors, and in lieu thereof I form the upper end of the
outer air heating chamber or regenerator with an inwardly sloping edge at a small
height above the tops of the burner tubes, while on the upper end of the central
flue, at a certain height above the tops of the burner tubes I provide an annular
disc extending laterally beyond the said ring of tubes. By this arrangement the
flame of the burner is first deflected inwardly by the sloping edge of the air
chamber and is then deflected to a considerable extent outwardly by the said
annular disc, after which it rises in a curve some distance above the said disc and
is then drawn down into the central flue, forming as it were an annular cascade of
flame spread out to a considerable width at the crown.
By this arrangement also the glass cylinder surrounding the flame as described
in my former Specifications can be dispensed with, the draught being sufficient to
maintain a steady flame without it. This steadiness is increased by the employ-
ment of an outer casing surrounding the air heating chamber, forming a second
annular air chamber the current of air from which passes against the outside of the
[Price 21

page_text: flame, in a similar manner to the arrangement described in my Specification
N° 5172 of 1880, the construction of the burner being also otherwise generally
similar to that therein described. In some cases, more particularly with heavy oil
gas, the burner, instead of being formed of a ring of tubes may consist of a
continuous annular passage similar to an ordinary Argand burner.
According to another modification, the before described annular deflecting disc is
made of greatly increased diameter, so as to spread the flame out to a considerable
extent, and in order to insure that the whole of the flame shall be drawn into the
central flue over the top surface of the disc, I provide a cap held at a slight distance
above the disc so as to leave a narrow annular orifice between the outer edges of
the two, into which the flame is drawn by the draught. The under surface of the
disc also acts as a reflector of light, and it is therefore by preference made of porcelain
or other reflecting refractory material. Its surface, as also that of the cap with
which the flame comes in contact have by preference a number of annular ribs
formed on them in order to prevent the flame as much as possible from coming in
actual contact with the surfaces.