Feb. 18.] THE NEW ZEALAND GAZETTE. 591

formed in the metal casing thereof and communicating with
the interior of the furnace through suitable holes, of a cover
adapted to fit upon the top of the said furnace, a flue-pipe
carrying the said cover, and a chamber in the said cover
through which the products of combustion pass and into
which the metal scrap to be melted is inserted, substantially
as described. (4.) In a tilting furnace, passages formed in
the metallic casing of the furnace proper, a cover to the said
furnace communicating with a flue-pipe and a jacket
around the said flue-pipe through which air for supporting
the combustion in the furnace is passed in order that it
shall be heated, the said air when it passes through the
passages in the metallic casing also serving to maintain the
same relatively cool, substantially as described. (5.) In a
tilting crucible furnace having a series of passages in the
metallic casing of the furnace proper, a stand or pedestal at
the lower part of the furnace and a series of arms for support-
ing the crucible at the upper part, one of which arms is
formed as a spout-piece, substantially as described. (6.) In a
tilting furnace, the combination of a furnace proper having
a metallic casing with passages formed therein, a cover
adapted to be placed over the furnace for the discharge
of the gases of combustion, and a crane or derrick the
axis of movement of which is in alignment with the
axis of rotation of the cover, for facilitating the move-
ment of the said cover, substantially as described. (7.) In
a tilting furnace, the combination of a metallic furnace-
casing having passages in the walls thereof communicating
with taper passages in the furnace-lining, a closed base upon
which the furnace stands, and holes or apertures for
admitting air from the base into the lower ends of the
passages in the casing, substantially as described. (8.) In
a tilting furnace, the combination of a metallic furnace-
casing having passages therein communicating with holes in
the furnace-lining, a circumferential passage around the
upper part of the said casing communicating with the
several passages therein, and hollow standards communic-
ating with the closed base and serving as a pivotal support
upon which the furnace can be tilted, the said standards
admitting air from the closed base into the circumferential
passage and thence into the casing-passages and the furnace,
substantially as described. (9.) A portable tilting furnace,
the furnace-body of which is designed to be lifted and tilted
by means of suspending ropes operated by independent winding
mechanism, and wherein segmental guide-bars are provided
for maintaining the ropes at a uniform distance apart during
the tilting operation, substantially as described.
(Specification, 10s. 6d.; drawings, 5s.)

No. 17490.—20th January, 1904.—JAMES MITCHELL
BAWDEN, of Seymour Street, Auctioneer, and EDWARD
HENRY CATTERALL, of Breed Street, Agent, both of Traralgon,
Buln Buln, Victoria. An improved double-legged coupling-
pin for road-vehicle shafts.

Claims.—(1.) An improved double-legged coupling-pin for
road-vehicle shafts, consisting of an upper leg and a lower
leg united by a bend, said legs being of the same length and
each having therein an inclined split-pin hole and a pivot-
pin hole, in combination with a pivot-pin in the upper leg, a
sheet-metal holdfast, wings above said holdfast pivoted to
aforesaid pin, an enlargement on said holdfast, a hole therein
to accommodate the lower leg, a split-pin through the
inclined hole in the said lower leg, all as and for the pur-
poses described, and as illustrated in the drawings. (2.) An
improved double-legged coupling-pin for road-vehicle shafts,
consisting of an upper leg and a lower leg united by a bend,
said upper leg being shorter than the lower and having a
pivot-pin hole therein, a pivot-pin in the said hole having
overhanging ends, wings above a sheet-metal holdfast pivoted
to said pin, an enlargement on said holdfast, a hole in said
enlargement to accommodate the lower member, an inclined
split-pin hole in said lower leg, a split-pin in said leg, all as
and for the purposes described, and as illustrated in the
drawings.
(Specification, 3s. 3d.; drawing, 1s.)

No. 17497.—23rd January, 1904.—JOHN THOMAS BLACKETT,
of Ivy House, Guisborough, York, England, Engineer. An im-
proved boring-machine for use in coal or ironstone mines or
the like places.

Claims.—(1.) In rock-drilling machines, gearing—for
operating the screw-bar or drill-spindle—comprising a clutch
spur pinion on a shaft parallel to the drill-spindle, a screw-
thread of quick pitch on said drill-spindle, and a feed-nut
engaging said screw-thread, so constructed and arranged that
when the clutch is thrown out of operative connection the
rotation of the screw-bar or drill-spindle is stopped, while the
feed-nut continues to be revolved so as to rapidly withdraw
or move backward said drill-spindle, substantially as set
forth. (2.) In a rock-drilling machine having a screw-bar or
drill-spindle provided with a screw-thread of quick pitch and
a feed-nut engaging said thread, differential gearing consist-
ing of a spur wheel slidably mounted on the drill-spindle, a
spur wheel fixed on the feed-nut, a pinion fixed on a shaft
parallel to the drill-spindle and with its teeth engaging the
teeth of the spur wheel on the feed-nut, a clutch pinion on
said shaft, means for disengaging said clutch pinion from
and re-engaging it with the teeth of the spur wheel on the
drill-spindle, and a gear on said shaft in engagement with
the driving-shaft of a motor, all arranged in combination
and operating, substantially as set forth with reference to
the drawing, and for the purposes specified. (3.) The com-
plete rock-drilling machine substantially as described, and
illustrated in the drawing.
(Specification, 3s. 6d; drawing, 1s.)

No. 17499.—29th January, 1904.—CARLO TURCHI, of 89,
Via Giovecca, Ferrara, Kingdom of Italy, Engineer. Im-
provements in apparatus for enabling telephonic and tele-
graphic messages to be transmitted over the same line wire.

Claims.—(1.) In apparatus for enabling telephonic and
telegraphic messages to be sent over a single-line wire be-
tween two or more stations, a separator comprising a closed
circuit arranged in inductive relation to or connected with
the line wire, and including one or more capacities, one or
more self-induction devices, and a differential coil having an
iron core arranged in inductive relation to a telephonic
receiver, the construction and arrangement being such
that telephonic currents can be transmitted from the line
wire to the telephonic receiver, whilst induced currents of
substantially different frequencies will be prevented from
affecting the telephone receiver, as set forth. (2.) In appa-
ratus for enabling telephonic and telegraphic messages to be
sent over a single-line wire, a separator according to the
preceding claim constructed with two branches that are
wound in opposite directions around an inner core to
form the differential coil, and one or other or each
of which is provided with at least one capacity or
one inductive-resistance device, as set forth. (3.) Appa-
ratus according to the preceding claims for enabling tele-
phonic and telegraphic messages to be sent over a single-
line wire wherein the circuit of the separator is connected to
the secondary winding of a transformer the primary winding
of which is in series with the line wire, as set forth. (4.) Ap-
paratus according to claims 1 and 2, wherein the separator
is connected at one end either directly or through the second-
ary winding of a transformer to the line wire and at the
other end to earth, as set forth. (5.) In apparatus ac-
cording to claim 1, a relay whereby telephonic messages can
be sent to line independently of the separator, the said relay
comprising a telephonic receiver located at the station and in
the telephonic circuit of a subscriber, and a microphone
transmitter upon which the telephonic receiver is arranged
to act, and which is connected to a secondary winding of the
line transformer so as to act directly on the line wire, as set
forth. (6.) Apparatus according to claims 1, 2, and 3 for
telephoning and telegraphing over a single-line wire, wherein,
in order to provide a path round the separator at the central
station for enabling telephonic messages to be transmitted by
a subscriber direct to the line wire independently of the said
separator, the telephone subscriber’s line is connected to the
telegraph-line through the intermediary of a series-connected
line transformer, and the subscriber is provided at his own
station with a separator of the kind set forth for transmitting
telephonic messages from the line to his telephonic receiver,
substantially as described, for the purposes set forth. (7.) Ap-
paratus according to the preceding claims for enabling tele-
phonic and telegraphic messages to be sent over a single wire,
wherein the line condensers, instead of being earthed, are
connected with one another by means of an existing tele-
graph-wire, which is not otherwise used for telephonic pur-
poses, so that the said condensers are thus provided with a
metallic return, as set forth. (8.) For enabling telephonic
and telegraphic messages to be sent simultaneously over a
single-line wire, apparatus constructed, arranged, and operat-
ing substantially as described with reference respectively to
and shown in Fig. 1 and in Fig. 2, or modified according to
Fig. 3, or to Fig. 4, or to Fig. 5, or to Fig. 6, or to Fig. 7 of
the drawings.
(Specification, 10s. 6d.; drawing, 1s.)

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 drawings
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.

F. WALDEGRAVE,
Registrar.