1464
THE NEW ZEALAND GAZETTE.
[No. 68

and backward, while the mineral is impelled across the table
underneath the surface of the lighter material and in a direc-
tion at an angle thereto, which angle varies, depending upon
the adjustment and upon the various forces at work. The
object of my invention is to increase the efficiency and capa-
city of this class of machines. The operating mechanism is
applicable for use with various kinds of concentrating-tables.
Other objects are economy of water and power, simplicity
and ease of operation and adjustment for different ores, and
simplicity and lightness of construction combined with
greater capacity. The principal feature of this mechanism
is that the swinging-table is held by springs intermediate
the ends of the throw or path of the table, and the cam
which moves the table in one direction acts to move the
table during a greater portion of the rotation of the cam, but
is freed from acting upon the table at the instant of the per-
cussion. An object of the invention is to give to the table a
perfectly smooth movement under a high speed of vibration.
I employ a cushioning spring and a stationary stop for
arresting the motion of the table when it has been swung to
the percussion side of the machine. The purpose of the
spring is to check and cushion the movement of the table
immediately before the table reaches the stationary stop.
In my invention I balance the table by means of springs, so
that the table rests normally on a balance under the force
of two springs acting in opposite directions. The table
when thus balanced has a natural rate of vibration, and will
vibrate a certain number of times per minute, depending
upon the tension of the springs, in a manner similar to the
balance-wheel of a watch. The number of complete vibra-
tions per minute must be greater than the number of revolu-
tions per minute of the cam which operates the table, so
that the cam will at no time outrun the table and overtake
the table-operating mechanism. The tension of the springs
governs the number of vibrations of the table per minute for
a given weight of table, and to increase the number of vibra-
tions per minute the tension of the springs must be increased.
In my invention I provide means for adjusting the tension of
all the springs, so that the rate of vibration can be adjusted
to the number of bumps per minute produced by the cam. I
preferably use a cam of special form for varying the speed at
different portions of the stroke as required for the most effi-
cient separation of the mineral from the waste, and to pre-
vent any bumping on the cam. It is an object of my inven-
tion to do away with any movement of the table which is
liable to cause internal vibration in the pulp while passing
over the table, and which would thus prevent the finer
mineral from settling to the table. In practical operation
there are certain limits of length and frequency of stroke
within which the most effective action can be obtained, and
a purpose in view in my invention is to secure a sufficient
length and rapidity of stroke to keep the pulp lively and
allow the mineral to settle to the table and to cause it to be
thrown toward the upper side of the table while lying on the
table, and to do this without producing any eddies, cross-
currents, or vibrations in the pulp which would keep the
finer mineral in suspension. I purpose to give to the table
such a movement as will tend to throw the mineral across
the table and diagonally upward against the course of the
water. The surface of the table may be riffled or unriffled;
the purposes of the riffles, as is well known, being to retard
the flow of the pulp at the bottom and to give the mineral a
better chance to settle.

[The number and length of the claims in this case preclude them
from being printed, and the foregoing extract from the specifica-
tion is inserted instead.]

(Specification, £1 9s.; drawings, 6s.)

No. 13028.—28th September, 1900.—WILLIAM ROBERT
BLYTHE, of Napier, New Zealand, Outfitter. An improve-
ment or improvements in shirts.*

Claim.—Making each sleeve of a shirt in two separate
parts, the upper part terminating a little below the elbow
and the lower part consisting of a cuff sewn on to a piece of
linen, calico, or other suitable fabric of such length that,
when the said lower part is attached to the upper by means
of buttons or studs, the two parts so attached form a com-
plete sleeve, essentially as described, and illustrated in the
drawings.

(Specification, 2s. 6d.; drawings, 2s.)

No. 13031.—27th September, 1900.—OSCAR PEAT, of York
Street, Parnell, Auckland, New Zealand, Carpenter. An
automatic adjustable chair.*

Claim.—An automatic adjustable chair, consisting of a
frame or body to a cross-stay on which the back frame of
the chair is pivoted, and to which are also pivoted battens
such as D, the back frame and battens being connected
together by means of a cross-stay, and means, such as the

chain H, whereby the back frame is prevented from tipping
too far back, as specified, and as illustrated in the sheet of
drawings.

(Specification, 1s. 6d.; drawings, 1s.)

No. 13166.—15th November, 1900.—CURT PAUL WEBEN-
DORFER, of 187, Clarence Street, Sydney, New South Wales,
Importer (nominee of Nicolas Pieper, of Liège, Belgium,
Manufacturer. Improvements in and relating to breech-
loading small-arms.

Claims.—(1.) In breech-loading small-arms, the combina-
tion with the barrel thereof of a trigger system comprising
a lever carrying an upwardly projecting rigid piece, and
operated by a spiral spring, as described and shown, and for
the purposes set forth. (2.) In breech-loading small-arms,
the combination, with a bolt carrying a firing-pin operated
by a trigger system, of an ejector, operated in the
manner described, and as illustrated in the drawings.
(3.) In breech-loading small-arms of the bolt type, the com-
bination of the aforesaid trigger system with an ejector, as
described and shown, and for the purposes set forth.

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

No. 13451.—6th March, 1901.—JAMES ROBERTSON, of the
Belleisle Cabinet-works, Belleisle Street, Govanhill, Glasgow,
North Britain, Cabinetmaker. Improvements in and re-
lating to domestic and other furniture.

Claims.—(1.) In an article of furniture, a rigid indivisible
pedestal A, B, C, D, recessed suitably for receiving one or
more drawers E; a hinged and collapsible cupboard portion,
comprising a top H, a back F, and two sides G, hinged
thereto, and adapted for being fitted upon pegged strips
a¹ and h¹; the said strips a¹ and h¹ with pegs a²; one or more
panels J capable of being united to the sides G with pegs a²
and holes a³, and held in position by means of hinged strips
b¹, and adapted for receiving lift off door or panel K; and
the hinged strips b¹: all substantially as described and
drawn, or any mere modification thereof, for the purposes
specified. (2.) In an article of dismembering furniture, the
combination therewith of a rigid indivisible pedestal A, B,
C, D, recessed suitably for receiving one or more drawers E,
having pegged side strips a¹ projecting upward above the
top B; a strip b¹ hinged to the part B, and grooves b² in
the said top: all substantially as described and drawn, or
any mere modification thereof, for the purposes specified.
(3.) In an article of dismembering furniture, the combina-
tion therewith of a cupboard receptacle, comprising a top H
with hinged and pegged strips b¹ and h¹, a part F with two
parts G hinged (or separable therefrom), having holes a³
formed therein, adapting them for being fitted upon
pegged strips a¹ and h¹, all substantially as described and
drawn, or any mere modification thereof, for the purposes
specified. (4.) In an article of furniture, a rigid plinth or
base-board a⁴ with pegged ends a⁵, a⁶, a top H with hinged
and pegged strips b¹, h¹, a part F, with two leaves G hinged
thereto, having holes a³ therein, adapting them for being
fitted upon the said plinth and top, and a binding base-
board b⁸, all substantially as described and drawn, or
any mere modification thereof, for the purposes specified.
(5.) In an article of dismembering furniture, the combina-
tion therewith of a plinth or fender-shaped base, a⁴ to a⁶,
fitted with pegs a², all substantially as described, with refer-
ence to Figs. 5 and 7 of the drawings, or any mere modifi-
cation thereof, for the purposes specified. (6.) In an article
of dismembering furniture, the combination therewith of a
base a⁴ with pegged parts a⁵, a⁶, a top H, having hinged and
pegged strips b¹, h¹, and parts G, with holes a³ formed
therein, all substantially as described, with reference to Figs.
5 and 6 of the drawings, or any mere modification thereof,
for the purposes specified. (7.) An article of dismembering
furniture, comprising a top H with hinged and pegged strips b¹,
h¹, a back f² with table supports g³, g⁴, g⁵, hinged thereto, and
having holes a³ adapting them for engaging with the pegs a²
upon the strips h¹, and a board b⁴ with fixing-devices g⁶,
all substantially as described, with reference to Fig. 8 of
the drawings, or any mere modification thereof, for the pur-
poses specified. (8.) In an article of dismembering furni-
ture, a top H with plain or unpegged strips h¹, drawer frame
L rigidly fixed to the top H; a board b⁴ and its fixing-devices
g⁶, supports g³ to g⁵ with the fixing-devices b¹, g⁷, g⁸, g⁶; the
board m¹ hinged to the part L, and adapted for being united
to the board b⁴: all substantially as described, with
reference to Figs. 9 and 10 of the drawings, or any mere
modification thereof, for the purposes specified. (9.) In an
article of dismembering furniture, the combination there-
with of a top H, having plain or unpegged strips h¹, and with
a drawer frame L, or its equivalent without drawers, separ-
ably or inseparably united thereto, and parts l¹ shaped and
adapted for fitting with precision into the spaces between
the members g³ and g⁷, together with the devices for fixing