Aug. 8.] THE NEW ZEALAND GAZETTE. 1629

the inside of the bulbs of incandescent electric lamps from
the deposit of carbon which may have accumulated thereon
during use or in the process of manufacture, by heating
such bulbs externally, whilst introducing air, heated or
oxygenised, into the same, and simultaneously therewith
withdrawing the products of combustion, substantially as
and for the purpose set forth. (7.) In a process for the
manufacture of incandescent electric lamps, the cleaning of
the inside of the bulb from any obscuring deposit of carbon
thereon by the application of external heat with simultaneous
access thereto of air or its equivalent, substantially as de-
scribed. (8.) In a process for the regeneration or “flashing”
of filaments in situ in their working-bulbs, the preliminary
heating of a mixed hydrocarbon gas and air to oxidize the
easily decomposable parts of the hydrocarbon vapour before
admission into the bulb for “flashing” or regeneration, to
prevent obscuration deposit upon the inside of the bulb,
substantially as described.
(Specification, 9s.; drawings, 1s.)

No. 13590.—9th May, 1901.—NATHANIEL BARRETT POWTER,
of 920, 72nd Street, Brooklyn, New York, United States of
America, Gentleman. Apparatus for and process of ex-
tracting grease and oil from substances containing same.

Claims.—(1.) The process which consists in applying suc-
tion to a mass of oil- and grease-bearing substance within a
closed vessel and in collecting the vapour so drawn off in a
liquid, such as water, so as to separate the oil and grease
from gases and vapours. (2.) The process of extracting
grease and oil from oil-bearing substances which consists in
subjecting such substances to the action of a heated vapour
or liquid within a closed receptacle and to mechanical disin-
tegration, in drawing off the vapours by suction after the
digestion, and in separating the grease and oil from the solid
residue. (3.) In a process of extracting grease and oil from
oil-bearing substances, the addition of a glue-restrainer, such
as salt, to the mass to be treated prior to or during its diges-
tion. (4.) The process of extracting grease and oil from oil-
bearing substances which consists in subjecting such mass
to the action of a heated vapour or liquid within a digester,
and then in passing the contents of such digester into a sepa-
rator having a size proportionate to the normal volume
occupied by a normal charge of the digester after the ter-
mination of the digestion therein. (5.) The process of
extracting grease and oil from oil-bearing substances, as
hereinbefore described. (6.) The process of extracting both
oil and grease, and glues and isinglass, from fish material,
which consists in cooking fish material in water in the pre-
sence of a glue-restrainer, such as salt, in removing the oil
and grease thereby liberated, in eliminating the glue-
restrainer, in cooking the residue in water to dissolve the
glues and isinglass, and in removing the solution so formed.
(7.) The process of extracting both oil and grease, and glues
and isinglass, from fish material, substantially as described.
(8.) Means, in connection with apparatus for treating oil-
bearing material, for catching the lighter oils carried off with
the vapours and gases by suction. (9.) A digester and sepa-
rator connected together, the separator having such size
relatively to the digester that a normal charge of the
digester, after treatment therein, substantially fills said
separator, as and for the purposes specified. (10.) A
digester having stationary and revolving stirring-arms in
combination with a separator connected therewith having
revolving arms only. (11.) A separator having its upper end
contracted, and provided with an oil-discharge opening
in substantially the apex of its contracted portion.
(12.) A separator provided with an oil-discharge open-
ing at the top thereof, and a screen below it, and
having a revoluble scraper with propeller-like blades for
clearing the screen. (13.) A vessel for the treatment of oils
and greases, and oil- and grease-bearing substances, having
upwardly convergent sides, and a discharge for oils and
greases at its upper end. (14.) A vessel for the purpose set
forth, having upwardly convergent sides substantially
throughout its length, and having a vertical shaft and
revoluble stirring-arms carried thereby. (15.) A vessel for
the purpose set forth, having upwardly convergent sides sub-
stantially throughout its length, and having a vertical shaft
projecting upwardly through its bottom, and a discharge-
orifice in its bottom to one side of the shaft. (16.) A digester
for the purpose set forth, substantially as described, and as
shown in Figs. 1 and 2 of the drawings. (17.) A separator
for the purpose set forth, substantially as described, and as
shown in Figs. 1 and 2 of the drawings. (18.) A combined
digester and separator for the purpose set forth, substantially
as described, and as shown in Fig. 3 of the drawings. (19.)
A vessel for the purpose set forth, having substantially the
form of two cones with their bases toward each other. (20.)
A vessel for the purpose set forth, having substantially the
form shown in Fig. 4 of the drawings. (21.) An apparatus
for the purpose set forth, comprising a digester, a separator,
purifying apparatus, a drier, and suction apparatus, all con-

nected together so as to make one continuous apparatus and
avoid the escape of deleterious and odorous gases. (22.)
The system of pipe-connections substantially as shown and
described. (23.) An apparatus for the extraction of oils and
greases from oil- and grease-bearing material, substantially
as shown and described.
(Specification, 19s.; drawings, 4s.)

No. 13595.—9th May, 1901.—THOMAS HAMMILL HICKS, of
48, Brackenridge Street, Fort Wayne, Indiana, United States
of America, Physician, and SAMUEL ROCKWELL ALDEN, of
190, West Berry Street, Fort Wayne aforesaid, Lawyer.
Improvements in apparatus for recovering amalgamable
metals and arsenic from ores, and preventing the escape of
mercury and fumes while treating the ores.

Claims.—(1.) In apparatus for recovering metals from
their ores, a rotatable retort for heating together ore and
mercury, having an open outlet end, in combination with
means for feeding ore and mercury into said retort, a
stationary gravity discharge-conduit having an enlarged
end or attached cap loosely closing the open end of said
retort, and means for creating a partial vacuum in said
retort whereby air is drawn into said retort between its
outlet end and said loosely closing cap or enlargement of
said conduit, and mercury-vapour and other fumes pre-
vented from escaping, substantially as described. (2.) In
apparatus for recovering metals from their ores, the combina-
tion with a retort for heating together ore and mercury of an
ore-collecting tank made to contain water and arranged to
receive ore from said retort, of a conduit arranged to convey
ore from the retort to said ore-collecting tank, and of an
agitator arranged in the ore-collecting tank to prevent the
ore from settling in said tank, substantially as described.
(3.) In apparatus for recovering metals from their ores,
the combination with a rotatable retort to heat pul-
verised ore, of two tanks made to contain water and
collect the contents of said retort, of two conduits
arranged one to connect each of said tanks with said
retort, of suction-means arranged to draw metallic
vapours, oxides, and gases driven off from the ore into one of
said tanks, substantially as described. (4.) In apparatus for
recovering metals from their ores, the combination with
a retort to heat ore, and a collecting-tank made to contain
water, of a conduit arranged to connect said tank with said
retort, of suction-means arranged to draw arsenious oxide
driven off from the ore in said retort into said collecting-tank,
of an agitator arranged in said tank to prevent the arsenious
oxide from settling in said tank, and means arranged to
draw the arsenious oxide out of said tank, substantially as
described. (5.) In apparatus for recovering metals from
their ores, the combination with a retort to heat ore and
mercury together, of a tank to collect the ore from said
retort, of an amalgamator to recover amalgamable metals
from the ore, and means to convey the ore from said tank to
said amalgamator, substantially as described. (6.) In ap-
paratus for recovering metals from their ores, the combina-
tion with a retort for heating together ore and mercury of an
ore-collecting tank having means for being supplied with
water, agitator within, a cover provided with an annular
flange projecting into said tank, the space within such flange
divided into compartments all sealed by the water in the
tank, a suction-pipe leading from one of said compartments
with means for applying suction therethrough, and an ore-
conduit arranged to discharge ore from said retort into
another of said compartments, substantially as described.
(7.) In apparatus for recovering metals from ores, the
combination with a rotatable retort, means for feed-
ing ore and mercury thereinto, and means for heat-
ing the same, of a tank into which ore discharges from
said retort, of an additional tank for collecting and
condensing arsenical vapours and fumes driven off from the
ore in said retort, of means for supplying each of said
tanks with water, of a suction-device arranged to draw air
into said retort for oxidizing arsenical vapours and to draw
such and other vapours into said additional tank, and to
draw into the first-named tank such gaseous substances as
pass out of the retort with the ore, of means for shutting off
said suction-device from either of said tanks, and of means
for drawing off water and other substances from each of said
tanks and keeping the air-compartments within the annular
flange of the cover of said tanks sealed with water, substan-
tially as described. (8.) In apparatus for recovering metals
from their ores, the combination with two rotatable amal-
gamating cylinders, one of said cylinders arranged to rotate
within the other, the inner surface of one of said cylinders
and the outer surface of the other cylinder composed of
metal which has an affinity for mercury, of a body of mercury
arranged in the outer cylinder sufficient in quantity to cause
a portion of the outer surface of the inner cylinder to dip
therein, of discharge-pipes arranged to rotate with said
cylinders and to assist in drawing off heavy portions of ore-
pulp from the surface of the mercury while said cylinders