2562
THE NEW ZEALAND GAZETTE.
[No. 75

vanes projecting beyond the blocks, and wherein the top,
bottom, side edges or margins, and the working and non-
working surfaces, respectively, of the vanes are parallel and
continuously smooth and unbroken throughout their length.
(Specification, 5s. 6d.; drawing, 1s.)

No. 24823.—20th August, 1908.—ERNEST SMITH BALDWIN,
of the firm of Baldwin and Rayward, of 256 Lambton Quay,
Wellington, New Zealand, Patent Agent (nominee of William
Thomas Smith, of Victoria Street Works, Bolton, Lancaster,
England, Engineer). Improvements in wheels for motor-
cars and other vehicles).

Claims.—(1.) A device for retaining detachable rims upon
vehicle-wheels of the kind set forth, wherein a plain expan-
sible ring is employed and attached to one side of the felloe
in such a manner that while the said ring may be com-
pletely removed when required it is also able to expand or
contract without becoming detached during such operation.
(2.) In a device of the kind set forth, the plain ring having
a number of slots to receive the stems of a corresponding
number of bolts, the said slots being so arranged as regards
their relative inclinations that the said ring is free to be
expanded or contracted by a cam device or other suitable
means. (3.) Apparatus having its parts constructed, arranged,
and adapted to operate, substantially as described, and as
illustrated in the drawings, for the purposes specified.
(Specification, 4s.; drawing, 1s.)

No. 24842. — 26th August, 1908. — JOSEPH MOFFAT, of
Christchurch, New Zealand, Inventor. An improved con-
struction of gate.

Extract from Specification.—The gate consists of a suitable
frame comprising a top and bottom rail that extend hori-
zontally along for the full length of the gate, and are joined
by the usual vertical members of the frame. These top and
bottom rails project beyond the outside vertical members of
the frame, and one end of each rail is pivotally mounted to a
suitable bracket bolted or otherwise attached to the gate-
post, while the other projecting ends of the rails are adapted
to lock with suitable means on the other gate-post.

[NOTE.—The above extract from the specification is inserted
in place of the claims.]
(Specification, 3s.; drawing, 1s.)

No. 24843.—26th August, 1908.—ALBERT KILBORN, of
Bondi, New Street, Middle Brighton, Victoria, Australia,
Engineer. Suction-operated-valve mechanism.

Extract from Specification.—Briefly stated, the mechanism
comprises a compound piston-valve and a double-ended
piston, each adapted to reciprocate in their cylinders by the
alternate communication at either end with suction and air
at atmospheric pressure, the compound piston-valve operating
the double-ended piston, and the latter causing a valve to
reciprocate across suitable ports connected with the motive
fluid to be controlled.

[NOTE.—The above extract from the specification is inserted in
place of the claims.]
(Specification, 6s. 6d.; drawing, 1s.)

No. 24864.—1st September, 1908.—THE WESTINGHOUSE
METAL FILAMENT LAMP COMPANY, LIMITED, of 2 Norfolk
Street, Strand, London, England, Manufacturers (assignees
of Anton Lederer, Ph.D. of 83, Atzgersdorf, Vienna, Austria).
Improved process for the production of hollow filaments
of tungsten or molybdenum for electric incandescent lamps.

Claims.—(1.) Process for the production of hollow filaments
of tungsten or molybdenum, consisting in depositing the metal
on a carbon core and subsequently removing said carbon core
by heating the filaments by means of the electric current in an
atmosphere containing nitrogen. (2.) Process for the produc-
tion of hollow filaments of tungsten or molybdenum in which a
carbon filament is heated by means of the electric current in an
atmosphere of vapours of halogen or oxy-halogen, compounds
of tungsten or molybdenum and hydrogen, the coated fila-
ment being then heated by means of the electric current in
an atmosphere of nitrogen and hydrogen, substantially as
described. (3.) The production of hollow filaments of
tungsten or molybdenum by heating a carbon filament in an
atmosphere of halogen or oxy-halogen compounds of tungsten
or molybdenum, nitrogen and a reducing gas, substantially as
described.
(Specification, 3s.)

No. 24865.—1st September, 1908.—THE WESTINGHOUSE
METAL FILAMENT LAMP COMPANY, LIMITED, of 2 Norfolk
Street, Strand, London, England, Manufacturers (assignees
of Anton Lederer, Ph.D. of 83 Atzgersdorf, Vienna, Austria).
Improved process for the production of tungsten filaments
for electric incandescent lamps.

Claim.—The process for the production of tungsten fila-
ments for incandescent electric lamps, which consists in
working up finely powdered tungsten into a plastic mass with
a solution of metatungstic acid, colloidal tungstic acid, or
ammonium metatungstate, pressing filaments therefrom in
the usual manner, then drying said filaments, and finally
heating the same to incandescence by means of the electric
current in a vacuum or in an atmosphere of a reducing gas,
substantially as described.
(Specification, 3s.)

No. 24923.—4th July, 1906.—HARRY CECIL MITCHELL, of
Ashmere House, Acre Lane, London S.E., England, En-
gineer. Improvements in and relating to the treatment of
paper and other surfaces.

[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.) A process of treating paper or other surface
for decorative purposes, consisting in applying smoke thereto
and in permanently fixing the deposit by a suitable surface
coating. (2.) A process of treating paper or other surface
for decorative purposes, consisting in the deposit of soot, fine
particles of carbon or the like, and the permanent fixture
thereof upon the surface treated by means of a coating
of a solution of a substance such as shellac, substan-
tially as described. (3.) A process of treating paper or
other surface, substantially as described. (4.) A surface of
paper or other material upon which soot, or fine particles of
carbon, or the like have been applied, permanently fixed
thereon by means of a coating of a solution of a substance
such as shellac, substantially as described.
(Specification, 4s. 6d.)

An asterisk (*) denotes the complete specification of an
invention for which a provisional specification has been
already lodged.

NOTE.—The cost of copying the specification and drawing
has been inserted after the notice of each application. An
order for a copy or copies should be accompanied by a post-
office order or postal note for the cost of copying.

The date of acceptance of each application is given after
the number.

Extracts from the drawings accompanying the foregoing
complete specifications appear at the end of this Gazette.

J. C. LEWIS,
Registrar.

Provisional Specifications accepted.

Patent Office,
Wellington, 30th September, 1908.

APPLICATIONS for Letters Patent, with provisional
specifications, have been accepted as under:—

No. 24491.—P. B. Ross, stirrup-iron.
No. 24607.—A. J. Park, rotary cement-kiln.
No. 24618.—N. M. McCorkindale, plough.
No. 24775.—H. Bostock, boots and shoes. (E. Bostock.)
No. 24777.—F. Basham, roadway.
No. 24810.—G. Craw, flax-treatment.
No. 24817.—G. Cocks, combination tool.
No. 24820.—P. van L. Alkemade, cleansing drinking-
glasses.
No. 24822.—A. Lyell, railway-carriage coupling.
No. 24826.—R. M. Maunder and H. Moffatt, taking down
curtains, &c.
No. 24827.—J. C. Hobbs, wax and oil extractor.
No. 24833.—W. T. Jenkin, weighing fluid, material, &c.
No. 24835.—W. McEachern, lifting-jack.
No. 24837.—C. S. Bayley, trolly-pole controller.
No. 24838.—E. L. Barton, aeronautical apparatus.
No. 24840.—P. Ellis, compressor.
No. 24844.—D. and G. Gilberd, pile-driver.
No. 24845.—A. Prior, box-manufacture.
No. 24846.—W. J. Howcroft, washing-machine.
No. 24848.—R. T. Bickerton, railway-carriage buffer,