IMPROVEMENTS IN FURNACES FOR MAKING LAMP-BLACK
Year: 1879

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane, in the
County of Middlesex, Patent Agent, for the Invention of "IMPROVEMENTS
IN FURNACES FOR MAKING LAMP-BLACK." A communication from abroad by
Henry Bagley Winslow, Edward Thompson Humphrey, and Jeremiah Buttrick,
all of Marblehead, in the County of Essex, State of Massachusetts, United
States of America.
Sealed the 25th May 1880, and dated the 15th December 1879.
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark at
the Office of the Commissioners of Patents on the 15th December 1879.
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of
Middlesex, Patent Agent. " IMPROVEMENTS IN FURNACES FOR MAKING LAMP-
BLACK." [A communication from abroad by Henry Bagley Winslow, Edward
Thompson Humphrey, and Jeremiah Buttrick, all of Marblehead, in the County of
Essex, State of Massachusetts, United States of America.]
This Invention relates to a furnace for burning oil for the production of lamp
black, and consists in certain novel features of construction whereby the use of
water is dispensed with and the character of the production improved.
The furnace is preferably double, and it is built of brick lined with fire-brick,
with a rear wall that divides the furnace room from the condensing room, side walls,
front and central dividing wall that divides the furnace into two long and narrow
fire spaces. The bottom of the fire spaces is formed by a sheet iron plate that is
supported by the walls, and the space below this plate serves as an air space through
which air circulates by openings in the front and side walls, this circulation of air
tending to keep the plate cool. The rear of the fire space extends upward and
communicates by an opening through the wall with the condensing room. The oil
or other liquid is supplied by pipes that enter from the outside near the rear of the
fire spaces. The outer end of each pipe is fitted with a cup shaped receptacle into
which the oil runs from the vertical branch of a main supply pipe, so that the
amount of oil running into each pipe may be observed and regulated by a cock.
The pipe will supply the oil to one or more furnaces, the supply of material to each
furnace being separately regulated. Shallow cast iron drip pans are placed in the
fire spaces beneath the pipes to receive the oil, and the oil running in faster than it
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page_text: will burn, will drop while on fire into the said pans, and be spattered into small
particles. These pans are to be changed frequently, access to them being obtained
by doors which are fitted in an opening in the front wall and provided with slides
to allow of ventilation when required. The slides and doors close air tight.
By constructing the fire space long and narrow, as above mentioned, the plate
which separates the fire and air spaces is more readily kept cool, and the space in
front of the point of combustion renders the smoke less liable to escape by the doors.
The products of combustion pass through the opening to the condensing room, which
will be lathed and plastered, and if the room is sufficiently large a number of
furnaces may be fitted to discharge into the same room.
The above described furnace is especially adapted for burning dead oil; but by
using burners of suitable construction other oils may be burned, and a superior
quality of lamp black made from mitigated spirits.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
tlie said Alexander Melville Clark in the Great Seal Patent Office on the 15th
June 1880.
28
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of
Middlesex, Patent Agent. IMPROVEMENTS IN FURNACES FOR MAKING LAMP-
BLACK." A communication from abroad by Henry Bagley Winslow, Edward
Thompson Humphrey, and Jeremiah Buttrick, all of Marblehead, in the County of
Essex, State of Massachusetts, United States of America.
This Invention relates to a furnace for burning oil for the production of lamp
black, and consists in certain novel features of construction whereby the use of water
is dispensed with and the character of the product is improved.
The improved furnace is shown in the accompanying Drawing, wherein Figure 1
is a vertical longitudinal section, and Figure 2 is a front elevation partially in
section.
Similar letters of reference indicate corresponding parts.
The furnace A, which is preferably built double, as shown, is constructed of brick
lined with fire brick, with a rear wall a that divides the furnace room from the
condensing room, side walls b, b, front c, and central dividing wall d that divides
the furnace into two long and narrow fire spaces. The bottom of the fire spaces e
is formed by a sheet iron plate f that is supported by the walls, and the space below
plate serves as an air space through which air may circulate by openings g in the
front and side walls, this circulation of air tending to keep the plate f cool. The
rear of the fire space e extends upward and communicates by an opening / through
the wall with the condensing room. In the front wall c there is an opening to each
fire space e and a door i to each opening. The oil or other liquid is to be supplied
by pipes / that enter from the outside near the rear of the fire spaces. The outer
end of each pipe k is fitted with a cup shaped receptacle 4, into which the oil will
run from the vertical branch of the main supply pipe m, so that the amount of oil
running into each pipe k may be observed and regulated by a cock. The pipe m
will supply the oil to one or more furnaces, the supply of material to each furnace
being separately regulated. In the fire spaces beneath pipes k are placed shallow
cast iron drip pans o to receive the oil, and the oil running in faster than it will
burn will drop while on fire into the pans o, and be spattered into small particles.
These pans are to be changed frequently, access to them being obtained by doors i.
A slide p is provided in each door i to allow of ventilation when required. The
slides and doors should close air-tight. By constructing the fire space e long and
narrow, the plate f is more readily kept cool, and the space in front of the point of
combustion renders the smoke less liable to escape by the doors. The products of
combustion pass through the opening to the condensing room, which will be lathed
and plastered, and if the room is sufficiently large a number of furnaces A may be
fitted to discharge into the same room.
The above described furnace is especially adapted for burning dead oil; but by
using burners of suitable construction other oils may be burned, and a superior
quality of lamp black made from mitigated spirits.
Having described the nature of the Invention, and the manner of performing the
same, I declare that what I claim as the Invention to be protected by the herein-
before in part recited Letters Patent is,-
1st. The improved furnace A, having a fire space e and escape passage h, air space
d, and openings g, and fitted with the oil supply pipe k, as and for the purposes set
forth.
2nd. In a furnace for making lamp black, the arrangement of the fire space e and
air space d, separated by a metal plate ƒ that forms the bottom of the fire space in

page_text: connection with the oil supply pipe k near the rear of the fire space, as and for the
purposes specified.
3rd. In a furnace for burning lamp black, the oil supply pipes / formed with cup
shaped ends in combination with the main pipe m, as and for the purposes set
forth.
In witness whereof, I, the said Alexander Melville Clark, have hereunto set
my hand and seal, this Fifteenth day of June, in the year of our Lord
One thousand eight hundred and eighty.
15 TADI
M. CL
даг
(x.S.)