punchings set one towards the other to form a dovetail
hollow, substantially as described and explained. (3.) Im-
proved sheet-metal lathing having reverse punchings at the
edges to the punchings in the body so as to form inter-
locking tubular selvages, substantially as described and ex-
plained. (4). Improved sheet-metal lathing, substantially as
described and explained, and as illustrated in the drawings.
(Specification, 2s. 6d.; drawing, 1s.)

No. 22649.-5th April, 1907.-FRANCIS WILLIAM PAYNE, of
Dunedin, New Zealand, Consulting Engineer. A submerged
ram.

Claims.- (1.) The submerging a ram in a river or stream,
said ram working by means of the current it is submerged in.
(2.) In a ram, the combination of the main valve worked by
gear from an air cylinder with the usual parts otherwise, said
ram submerged in the stream, part of which it is designed to
lift, all substantially as set forth. (3.) In combination, a
submerged ram having the main valve worked by independent
power so as to deliver each stroke at time intervals, all
substantially as set forth. (4.) The concentration of current
by means of contracting inlet in combination with a sub-
merged ram, substantially as set forth and as shown on the
drawing.

(Specification, 3s. 6d.; drawing, 2s.)

No. 22730.-24th April, 1907.-JOHN TOUTCHER, of 244
Dorcas Street, South Melbourne Victoria, Australia, Com-
mercial Traveller, and CHARLES JOHN HICKS, of 525 Bridge
Road, Richmond, Victoria, Australia, Commercial Traveller
(assignees of Arthur Emanuel Strickland, of Wheatley Road,
North Brighton, Victoria, Australia). An improved lawn
spray or sprinkler.

Extract from Specification.-This invention consists of a
circular chamber with an inlet pipe in the centre of the bottom
and an exit opening in the centre of the top, the chamber
being divided into upper and lower compartments by a hori-
zontal plate or disc fastened to the wall of the chamber, and
having a number of radial openings around its edge or periphery,
the edge of the plate adjacent to the openings being bent or
inclined to cause the water as it passes from the lower to the
upper compartment to take on a rotary motion.

[N.B.-The above extract from the specification is inserted
in place of the claims.]

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

No. 22751.-26th April, 1907.-CLAUDE HARDING O'BRIEN,
of Bureau, Central Sugar Mills, Brisbane, Queensland, Austra-
lia, Analytical Chemist. Improved process for purifying
washed acetylene gas.

Claims.--(1.) In the purification of acetylene gas whereby
the same may be burnt through burners provided with
incandescent mantles, the initial operation of thoroughly
drying the crude gas by means of any suitable dehydrating
agent, but preferably by the employment of unused and
fresh calcium carbide, as specified. (2.) In the puri-
fication of acetylene gas whereby the same may be burnt
through burners provided with incandescent mantles as an
initial stage, thoroughly drying the gas by passing the same
in a thin layer preferably over unused and fresh calcium
carbide; second, passing the dried gas in a thin layer over
chloride of lime, whereby the phosphorus and sulphur com-
pounds in the gas may be intercepted or absorbed and
chlorine evolved; and third, passing the gas thus deprived
of the phosphorus and sulphur compounds, but charged
with chlorine, in a thin layer over slacked lime or dry
generator refuse for the purpose of intercepting and getting
rid of the chlorine, as specified.

(Specification, 5s. 3d.)

No. 22752.-26th April, 1907.-CLAUDE HARDING O'BRIEN,
of Bureau, Central Sugar Mills, Brisbane, Queensland, Aus-
tralia, Analytical Chemist. Purifier for acetylene gas.

Claims.--(1.) In a purifier for the purification of acetylene
gas, a purifier-case of circular or oval form, with one flat
side, in which the door-opening is placed, such door-opening
not exceeding one-half the superficial area of the flat side
of the case, as specified. (2.) In a purifier for the purifica-
tion-of acetylene gas, a purifier-case of circular or oval form,
with one flat side, in which the door-opening is placed,
horizontal shelves within the case dividing the interior of
the case into four or more shallow compartments, holes
alternating in the shelves and adapted to force the gas as it
passes through the purifier to take an oblique and serpentine
course over the surface of the shelves, as and for the pur-
poses specified. (3.) In a purifier for the purification of
acetylene gas, a purifier-case of circular or oval form, with
one flat side, in which the door-opening is placed, such door-
opening not to exceed one-half the superficial area of the
flat side, horizontal shelves within the case dividing the
interior of the case into four or more shallow compartments;
trays upon the shelves to contain the purifying materials,
such trays being divided into sections whereby they may be
removed without tilting them through the restricted door-
openings, and holes alternating in the shelves whereby the
gas as it passes through the purifier shall be forced to take
an oblique and serpentine course over the surface of the
materials in the trays, as and for the purposes specified.
(4.) In a purifier for the purification of acetylene gas, a
purifier of any suitable shape, internally divided by shelves
into four or more shallow compartments, the shallowness of
the compartments being such that the gas as it passes
obliquely over the surface of the purifying materials that
are laid on the shelves shall be in a very thin layer between
the top of the compartment and the surface of the purifying
materials on the shelves, whereby the passing gas shall be
forced into intimate surface contact with such purifying
materials, as specified.

(Specification, 7s. 3d.; drawing, 1s.)

No. 22753.-26th April, 1907.-CLAUDE HARDING O'BRIEN,
of Bureau, Central Sugar Mills, Brisbane, Queensland, Aus-
tralia, Analytical Chemist. An automatic water-feed for
acetylene-gas generators.

Claims.-(1.) In that class of acetylene-gas gene-
rators described, a central tube, such as F, provided with
slots at different elevations, such slots being adapted to
receive the tail ends of lever-arms at different elevations
that operate valves, whereby water may be admitted to the
generators, as specified. (2.) In that class of acetylene-
gas generators herein described, a central tube, such as F,
provided with slots at different elevations, such slots being
adapted to receive the tail ends of valve-lever arms at dif-
ferent elevations, in combination with a central tappet rod,
such as H, that rises and falls with the bell of the gas-holder,
and is adapted to engage the tail ends of the lever-arms as
the bell descends, and thus open the valves to admit water to
the carbide chambers, as set forth. (3.) The general arrange-
ment, construction, and combination of parts in the auto-
matic water-feed for acetylene-gas generators, as set forth,
and for the purposes specified.

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

No. 22794.--4th May, 1907.-DONALD MCKENZIE, of In-
vercargill, New Zealand, Flax-miller. Improvements in
flax-strippers.

Claims.--(1.) In a flax-stripper, a chair properly designed
to allow of beater-bar to be securely fixed, so that tension of
fastening-bolts of same is same direction as pressure of work,
as shown in plan and described in specifications. (2.) In a
chair as described, an eyebolt capable of holding the end of
fixed beater bar as commonly used, and by means of nuts
on said bolt to tighten beater-bar against chair, as described
and shown on plans. (3.) In a flax-stripping machine, the
combination of a chair as described in clause 1 with eyebolt
in clause 2 capable of holding beater-bar rigid, and thereby
causing less vibration and wear-and-tear.

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

No. 22799.-10th May, 1907.-COLIN CAMPBELL CAMERON,
of Banks Peninsula, New Zealand, Labourer. Improve-
ments in sledges or the like.

Claims.--(1.) In sledges, the combination with the runners
of a framework mounted between them and carrying wheels
thereon which may be caused to take the weight of the
sledge when desired, substantially as specified. (2.) In
sledges, the combination with runners having inclined slots
formed in them of a framework comprising axles passing
across between the runners and projecting out through the
inclined slots therein and wheels mounted upon the outer
ends of the axles substantially as specified. (3.) The im-
provements in sledges substantially as described and ex-
plained, as illustrated in the drawings, and for the purposes
set forth.

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