MAY 2.] THE NEW ZEALAND GAZETTE. 1429

(2.) The improvement in the treatment of zinc and lead sul-
phide ores, as set forth in the preceding claim, in which the
bath is also capable of keeping liquid at the working-tem-
perature the residue from the reaction, substantially as
described. (3.) The improvement in the treatment of zinc
and lead sulphide ores, as set forth in claim 1, in which the
bath is formed of a mixture of one or of several earthy bases,
with one or several suitable metallic oxides, substantially
as described. (4.) The improvement in the treatment of
zinc and lead sulphide ores, as set forth in the preceding
claim, in which the earthy bases of which the bath is formed
comprises a mixture of lime, calcined dolomite, or both
together, with ferric oxide or manganese-oxide, or both
together, substantially as described. (5.) The improved
process of treating zinc and lead sulphide ores, substantially
as and for the purpose described.

(Specification, 12s.)

No. 22373.—31st January, 1907.—JOHN CHARLES PRESTON,
of 343 Sussex Street, Sydney, New South Wales, Australia,
Civil and Mechanical Engineer. Improvements in elastic-
fluid motors.

Extract from Specification.—This motor is essentially
designed to be an improvement on what might be termed
direct-acting motors actuated by elastic fluids. The motor
consists of a cylinder containing a piston, or it may be other-
wise described as two pistons rigidly connected to one another,
or two separate pistons. At the side of the cylinder is
another cylinder, but smaller, which contains the slide or
piston valve. This slide-valve is actuated by steam or other
fluid, the admission and exit of which to and from the slide-
valve is controlled by the piston in the cylinder.

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

(Specification, 5s. 6d.; drawing, 5s.)

No. 22302.—8th January, 1907.—WALTER ERNEST POTTS,
of Gore, New Zealand, Engineer. Improvements in attach-
ments to dredges for bucket scouring and gold-saving.

Claims.—(1.) In gold-saving, the sluicing or hosing-out of
the buckets of a bucket dredge after they are fully emptied
in the usual manner and just before they re-enter the water
that said dredge floats in, by a combination of protected
nozzles with the usual save-all chute, made movable and
attached to the ladder by adjustable links, &c., all sub-
stantially as set forth and as described and as explained.
(2.) In gold-saving on bucket dredges, protected nozzles
directed so as to wash out any particles that may cling to the
buckets, with the lower chute arranged to automatically
maintain its position for receiving any material thus washed
out, all substantially as set forth. (3.) In gold-saving, in
combination, nozzles protected from falling lumps, and from
their construction causing an induced air-current, so directed
that they clean out approaching buckets of a gold bucket
dredge and deliver any material so washed out into the lower
or save-all chute, which is altered to be always in the best
position for this purpose, all substantially as set forth.

(Specification, 3s. 6d.; drawing, 1s.)

No. 22339.—24th January, 1906.—ROBERT BROWN, of
16 Great George Street, Westminster, London, England,
Engineer. Improvements in electric switches for electric
traction on the surface-contact system.

[NOTE.—This is an application under section 106 of the Act, the date
given being the official date of the application in Great Britain.]

Claims.—(1.) The employment in electric traction on the
surface-contact system, of a switch comprising a spindle
having mounted thereon an arm capable of bridging terminals,
connected respectively to the main conductor and the con-
tact-stud, such spindle being also provided with a lever
mounted thereon or otherwise connected thereto, which is
operated on the passage of a vehicle to close the circuit to
the contact-stud, and to automatically cut off the current
thereto immediately the vehicle has passed, substantially
as specified. (2.) Mounting the lever described in claim 1
so that it projects horizontally across the slot or conduit,
substantially as specified. (3.) In a switch of the construction
specified in claim 1, mounting the spindle so that it is capable
of rotation by an operating-bar carried by the vehicle coming
in contact with its lever, thereby completing the circuit to
the contact-stud, and providing means, such as a pair of
angular-surfaced sleeves, as described, for insuring the return
of the parts to their normal position after the vehicle has
passed, substantially as specified. (4.) In a switch of the
construction specified in claim 3, forming the upper part of
the casing thereof as a receptacle for grease or similar material
for keeping the parts lubricated, and preventing the access
of moisture to the contact-making parts, substantially as
specified. (5.) In a switch of the construction specified in
claim 1, mounting the spindle so that it is capable of sliding
longitudinally in the casing, and providing means, such as
the eccentric disc described, for communicating to such
spindle the motion imparted to its lever by the operating-
bar carried by the vehicle, and for returning the parts to their
normal position after the vehicle has passed, substantially
as specified.

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

No. 22374.—31st January, 1907.—JOHN CHARLES PRE-
TON, of 343 Sussex Street, Sydney, New South Wales, Aus-
tralia, Civil and Mechanical Engineer. Improvements in
sheep-shears and similar machines for other like purposes.

Claims.—(1.) In shearing-machines, the use of a bar such as
D to drive the cutters suitably supported in case, substantially
as and for the purposes described and explained, and as shown
in the drawings. (2.) In shearing-machines, a bar such as D
in combination with an elastic-fluid motor such as F, sub-
stantially as and for the purposes described and explained,
and as shown in the drawings. (3.) In shearing-machines,
a bar such as D in combination with a centre post such a
G, substantially as and for the purposes described and ex-
plained, and as shown in the drawings. (4.) In shearing-
machines, a tension-screw such as E in combination with a bar
such as D, substantially as and for the purposes described
and explained, and as shown in the drawings. (5.) In shearing-
machines, the position of the motor F placed near the cutters,
substantially as described and explained, and as shown in
the drawings. (6.) In shearing-machines, the position of the
tension-screw placed under the body of the machine, sub-
stantially as and for the purposes described and explained,
and as shown in the drawings.

(Specification, 3s. 3d.; drawing, 2s.)

No. 22450.—2nd July, 1906.—ANDREW JOSEPH BERGIN,
of Darling Street, Rozelle, near Sydney, New South Wales,
Commonwealth of Australia, Hotelkeeper. Improved motor-
cycle belt.

[NOTE.—This is an application under section 106 of the Act, the date
given being the official date of the application in Australia.]

Claims.—(1.) A belt for the purposes specified, comprising
a plurality of leather, indiarubber, or guttapercha pads or
strips threaded closely upon a chain or wire rope, the faces
and edges of the pads or strips being tapered for the purposes
specified, substantially as described. (2.) In a power-trans-
mission belt, in combination with a flexible metal core, of a
series of pads or strips of leather or guttapercha closely
threaded thereon, the faces thereof tapered to enable them to
lie together when passing over the curvature of the pulley-
wheels, and the edges tapered to engage with the taper of
the groove therein, substantially as described. (3.) In a
power-transmission belt, the combination with a flexible
core, consisting either of a chain or wire rope, of a plurality
of pads or strips of leather, guttapercha, or suchlike, formed
as described, and closely threaded upon such core, sub-
stantially as described.

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

No. 22471.—28th February, 1907.—SOCIETA DI ESPOR-
TAZIONE POLENGHI-LOMBARDO, of Codogno, near Milan, Italy,
Manufacturers and Exporters, and Dr. EMILIO SONCINI, of
Milan, Italy, Chemist. Improvements in the treatment of
skimmed milk and milk-serum.

Claims.—(1.) A process for the treatment of milk and its
derivatives, consisting in subjecting the same to the action of
sulphur-dioxide. (2.) A process for the treatment of milk
and its derivatives, consisting in subjecting the same to the
action of sulphur-dioxide in watery solution. (3.) A process
for the treatment of milk and its derivatives, consisting in
subjecting the same to the action of a gaseous current of sul-
phur-dioxide. (4.) A process for the production of caseine