Sept. 17.] THE NEW ZEALAND GAZETTE. 2083

against the spring ring contained in the concentric flanges
before described on under-side of seat, and thus make an air-
tight joint ; 11 shows an outlet-pipe for exit of foul air to
ventilator.

[NOTE.—The above extract from the specification is inserted in
place of the claims.]

(Specification, 1s. 3d. ; drawing, 1s.)

No. 16853.—26th August, 1903.—HERMANN PASSOW, of 33,
Billhorner, Rohrendamm, Hamburg, German Empire, Doctor
of Chemistry. An improved process and means for the treat-
ment of blast-furnace and other slags.

Claims.—(1.) A process of treatment of slag or similar
molten materials for the purpose of producing a material for
the direct manufacture of cement, consisting of disintegrating
the material in a molten state, the cooling of the particles as
nearly instantaneously as possible from the fluid condition to
a solid or plastic condition, and the subsequent cooling of the
said particles at a slow rate to a temperature below a visible
heat so as to produce a chemically active material. (2.) A
process of treatment of slag or similar molten materials, con-
sisting of disintegrating the material in a molten state so
that the particles are cooled as nearly instantaneously as
possible from the fluid condition to a solid or plastic condi-
tion, one part of such material being then further cooled as
rapidly as possible to a temperature below a visible heat
being then chemically inert, the other part of such material
being allowed to cool slowly to a temperature below a visible
heat being then chemically active, for the purpose of pro-
ducing together two materials for the direct manufacture of
cement. (3.) Apparatus for carrying out the process as
claimed in claims 1 and 2, consisting of a pulverising element
capable of being regulated so as to produce particles of defined
character, and a cooling medium or mediums capable of
being regulated as to temperature for the purpose of produc-
ing chemically inert and active slags at will, substantially as
described. (4.) Apparatus for carrying out the process as
claimed in claims 1 and 2, consisting of a steam, or steam
and air, or gas blast capable of being regulated as to pressure
or quantity, or with means of regulating the temperature of
the air through which the particles are projected, and recep-
tive cooling-surfaces capable of being regulated as to tem-
perature for the purpose of producing chemically inert and
active slags at will, substantially as described. (5.) Apparatus
for carrying out the process as claimed in claims 1 and 2,
consisting of a mechanical disintegrator or disperser capable
of being regulated as to speed, means for regulating the
temperature of the air through which the particles are pro-
jected, and receptive cooling-surfaces capable of being regu-
lated as to temperature for the purpose of producing
chemically inert and active slags at will, substantially as
described. (6.) Apparatus for carrying out the process as
claimed in claims 1 and 2, consisting of a pulverising element
capable of being regulated so as to produce particles of defined
character, a cooling medium or mediums capable of being
regulated as to temperature, and a source of supply of water
acting on the still-fluid slag so that, without permanently
wetting it, it acts to open up a structure in the slag-particles
for the purpose of producing chemically active slag, substan-
tially as described. (7.) Apparatus for carrying out the pro-
cess as claimed in claims 1 and 2, consisting of the elements
claimed in claims 3 to 6, in combination with means for pro-
ducing an unequal disintegration and cooling of the slag so
that, all the other elements being regulated to a fixed condi-
tion, both chemically inert and active slags are produced
together, substantially as described. (8.) Apparatus for
carrying out the process as claimed in claims 1 and 2, con-
sisting of the elements claimed in claims 3 to 6, in combina-
tion with means for arresting one part of the projected
particles by a surface capable of being controlled as to
temperature, and such particles falling on a receiving-surface
capable of being controlled as to temperature, with means
for receiving and collecting, when further cooled, the other
part of the projected particles, substantially as described.

(Specification 8s. ; drawing, 1s.)

No. 16861.—21st August, 1903.—THE REEVES PATENT
FILTERS COMPANY, LIMITED, of 9 and 11, Fenchurch Ave-
nue, London, England, Manufacturers (assignees of Wilfred
Reeves, of Kingscourt, Wellington Place, Belfast, Ireland).
Improvements in filters.

Claims.—(1.) A filter for liquids, comprising an upper
filtering-chamber and a lower or collecting chamber, a parti-
tion provided with intercommunication-nozzles between the
two chambers, an annular channel outside the upper cham-
ber and communicating therewith, two valved pipes com-
municating with the said annular chamber adapted respec-
tively for the admission of the liquid to be filtered and the
discharge of fouled liquid from the cleansing of the filter,
valved pipes communicating with the lower chamber for the
discharge and admission of filtered and cleansing liquid re-
spectively, another valved pipe communicating with the said
lower chamber for the outlet of fouled filtrate, constructed
and operating substantially as described with reference to
Figs. 1 and 2. (2.) The modified filter in which the annular
chamber is formed inside the upper chamber, which latter is
provided with an airtight cover, substantially as described
with reference to Figs. 3 and 4. (3.) In combination with
the described filters, an agitator comprising a horizontal
beam fixed to a vertical shaft and provided with teeth which
project downwards into the filtering-material, and means for
rotating the said shaft, substantially as described.

(Specification, 4s. 6d. ; drawing, 1s.)

No. 16862.—21st August, 1903.—EDWARD TOWLSON, of 1,
Westmoor Terrace, Chatteris, Cambridgeshire, England,
Engineer, HERBERT RICHARD MOULTON, of 40 and 41,
Upper Thames Street, London, England, Merchant, and
FREDERICK CHARLES SOUTHWELL, of 75, Southwark Street,
London aforesaid, Engineer. Improvements in steam and
other fluid-pressure engines.

Claims.—(1.) In a rotary engine, the combination of an
annular chamber, two pairs of pistons in the chamber, a pair
of shafts, one connected to one pair of pistons and the other
to the other, a crank on each shaft, a main shaft, cranks on
this main shaft, links connecting the cranks, and means for
admitting motive fluid to the chamber and exhausting it
therefrom, substantially as described. (2.) In a rotary
engine, the combination of two plates forming an annular
chamber, two pairs of pistons in the chamber, a pair of
shafts, one connected to one pair of pistons and the other to
the other, bearings for the shafts at the centres of the plates,
a crank on each shaft, a main shaft, cranks on this main
shaft, links connecting the cranks, and means for admitting
motive fluid to the chamber and exhausting it therefrom,
substantially as described.

(Specification, 2s. 9d. ; drawing, 1s.)

No. 16870.—27th August, 1903.—THE WILFLEY ORE-
CONCENTRATOR SYNDICATE, LIMITED, of 7–11, Moorgate
Street, London, Middlesex, England (assignees of Arthur
Redman Wilfley, of Denver, Arapahoe, Colorado, United
States of America, Engineer). Improvements in the method
of and means for concentrating ores.

Claims.—(1.) The described method of concentration,
which consists in progressing the larger and lighter portions
of the gangue over the surface of a deck or table which is
given a suitable motion to cause this effect, such surface
adapted to hold the ore that will not move by inertia or
which moves very slowly, and finally washing the material
thus caught in the interstices of the surface therefrom,
whereby to accumulate the concentrates thus caught and
prepare the surface for treatment of more ore. (2.) The
combination with a deck or table having a canvas or similar
surface which will hold the ore that does not move over the
surface by inertia, of means for imparting a differential
motion to the deck or table, and means for washing the ore
caught and held by the surface, whereby to accumulate the
concentrates thus caught and prepare the surface for further
usefulness.

(Specification, 3s. ; drawing, 1s.)

No. 16871.—27th August, 1903.—THE WILFLEY ORE-CON-
CENTRATOR SYNDICATE, LIMITED, of 7–11, Moorgate Street,
London, Middlesex, England (assignees of Arthur Redman
Wilfley, of Denver, Arapahoe, Colorado, United States of
America, Engineer). Improvements in the method of and
means for concentrating ores.

Claims.—(1.) In a concentrator, a concentrating-surface
which travels in one direction and is so operated that a pro-
gressive movement is imparted to the material thereon in
another direction. (2.) In a concentrator, a concentrating-
surface which is moved in such a manner as to have a
tendency to progress the material thereon in another direc-
tion. (3.) In a concentrator, a concentrating-surface which
travels in one direction and has imparted thereto a pro-
gressive motion at right angles to its travel. (4.) In a con-
centrator, the combination with an endless travelling belt
composed of transversely disposed troughs which are closed
at one end and open at the opposite end, of driving mechan-
ism for reciprocating the belt in a direction endwise of the
troughs. (5.) In a concentrator, the combination with an
endless travelling belt composed of transversely disposed
troughs which are closed at one end and open at the opposite