1030

THE COLLIERY GUARDIAN.

May 16, 1913.

between the driving spindle and the blade-hub which
permits relative slip. Fig. 1 is a side elevation of that part



of the fan which concerns the invention; fig. 2 shows the
same mechanism viewed from the right of fig. 1, and fig. 3
is a section on the line 3—3 of fig. 2. (Nine claims.)

10632 (1912). Improvements in Truck Tipplers or Means for
Discharging the Contents of Trucks and like Vehicles. G. A. P.
Provay, of Post Office Box 321, Lourenco Marques,
Portuguese East Africa.—Relates to that type of device in
which the truck is received bodily in a revolvable structure
provided with grooved bands or rings for the reception of
ropes by which said structure can be operated to partially
invert or incline the truck to discharge its contents, the

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truck being supported on a carriage movable transversely of
said structure, and provided with a length of rails which are
adapted to be aligned with the rails of the main track, the
carriage automatically assuming a position in which the
length of rails carried by it are placed in alignment with the
rails, when the revolvable structure is placed in a position
in which the truck is upright. (Fourteen claims.)

13852 (1912). Improvements in Methods and Apparatus
for Performing Tunnelling, Boring, and like Operations.
E. C. R. Marks, of 57 and 58, Lincoln's Inn-fields, London,
W.C. (a communication from abroad from Normon Ebbley,
of Wallace, Idaho, U.S.A.).—Has particular reference to
that type of apparatus wherein rotary cutting mechanism
is provided for cutting a channel or channels in the forward

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face of a tunnel or the like, and means are also provided for
breaking down the material adjacent the incisions so
formed. An important feature consists in a method wherein
one or more annular channels are cut in the material and a
pure hammering action is simultaneously directed upon the
materal adjacent the channels so cut to batter down the
material so weakened. Means are provided for re volubly
supporting one or more drills and one or more hammers.
Subsidiary features consist in providing means for adjusting

the operating tools, which latter are mounted upon a
revoluble head, and also providing the head with a number
of tubular arms, some of which convey the operating fluid
to the tools, whilst others convey water to be sprayed
upon the face of the material to keep down the dust.
Figs. 1, la are separated views principally in elevation and
part in broken section, showing the front and rear ends
respectively of a tunnelling machine embodying the improve-
ments ; fig. 3 is an enlarged secti nal detail view showing
the interior construction of a portion of the machine drill-
head. (Five claims.)

16211 (1912). Improvements in Weighing Machines. G. H.
Denison, Hunslet Foundry, Leeds.—Has reference to the
class of apparatus that is used for ascertaining the weight,
on separate wheels, of locomotive engines and other vehicles,
and described in Specification No. 27550/1906, in which the
weight of a vehicle is indicated upon a steelyard by the
adjustment of poise weights. The object of this invention

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is to render, each apparatus automatic in its weighing, by
the substitution of a dial or quadrant self-indicating
mechanism for the steelyard and poise weights. The
accompanying drawings show the weigher coupled to an
automatic indicator of the spring balance type. Fig. 1 is a
front elevation, showing the weigher in dotted line ; fig. 2
is a side elevation of the complete machine; fig. 3 is a plan
view. (One claim.)

21666 (1912). Improvements in and Connected with Pile-
plankings of Rolled Iron. M. Schiffler, of Stefanstrasse 10,
Aachen, Germany.—Relates to improvements in a pile-
planking of rolled iron described in the Specification of
September 20, 1912, No. 21419, and consists in that between
the two guiding parts lying in the neutral axis of each
member of the planking, there are formed two whole or
non-interrupted slanting walls and two half or interrupted
slanting walls. By reason of the improved arrangement
the member, during the rolling process, is supported on the
roller path by two surfaces s s1 as shown in fig. 4, and the

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X X axis remains parallel with reference to the axes of the
rollers, so that the member, in order that it may be brought
into engagement with the next following groove of the
rollers, has only to be elevated and has not to be turned,
and the cost of manufacturing the members is reduced. In
fig. 5 a pile-planking is represented which is composed of
members formed according to the invention, each member
being provided with two whole or non-interrupted slanting
walls and two interrupted slanting walls. (Two claims.)

21694 (1912). Improvements in Compressed Air Driven
Winding, Haulage, and like Motors. Ernest Leroyer, of
Henin-Lietard, Pas-de-Calais, France. — This invention
relates to compressed air driven winding, haulage, and like
engine, of the kind which, although ordinarily used as a
motor, can be converted into an air compressor when desired.
The object of the invention is not only to provide for con-
version into a compressor, but further permit of the power
absorbed in driving it under these conditions when it acts
as a brake, being adjusted. If, for example, the power
absorbed was too great the load would not descend, and if
on the contrary it was too little the engine alone would not
hold the load. The regulation of the power absorbed is
therefore indispensable for regulating the descent of a load.
Fig. 1 is a vertical section of the controlling valve ; fig. 2 is
a vertical section; and fig. 3 is a horizontal section taken
through the cylinder of a winding engine constructed
according to the invention. Fig. 4 is a side elevation,
drawn to a smaller scale than figs. 1 to 3, of the complete
engine. The engine is constructed so that when driven by
a descending load it can be converted into an air compressor
so as to compress air back into the compressed air container
again through the ordinary supply pipe, the controlling
valve in the said supply pipe being so constructed that it
will permit of this action. This valve 1 is provided with a

loose lift valve 2 (see fig. 1), which can be raised to admit
compressed air to the motor by means of a screw 3a, actuated
by a hand-wheel 3, and is automatically raised when the air
pressure below it, that is on the engine side, exceeds that
above it, when the engine is acting as an air compressor.
When working as an engine, the piston 8* and slide valves 7
work together in the same manner as in an ordinary engine,
the former being connected to a crank on the main shaft,
and the latter to excentries or the like on said shaft, through
link motion or other suitable form of reversing gear. The
exhaust is effected partly through the openings 9, which
are uncovered by the piston at the end of each stroke, and
partly through the ports 10 and 11, controlled by the piston
valves 7. When the apparatus is driven by a descending
load, it acts as an air compressor and thus provides its own
braking action, by forcing the air admitted through the
openings 9, back to the compressed air supply by way of the
ports or passages 12 and 13, valve chambers 16 and 17, ports
or passages 22 and 23, slide valve chamber 6, and air supply
pipe 5. Return of this compressed air is prevented by the
check valves 14 and 15 provided for this purpose. When
the engine is acting as a prime mover, it works like an
ordinary engine, the admission of compressed air to the
cylinder 8 being controlled by the slide valve 7. In this
case the check valves 14 and 15 jremain closed, as they are
subject to equal pressure on both sides. When the openings 9
are uncovered at the ends of the stroke of the piston 8a, the
inlet ports are closed, and the bulk of the air will escape
through said openings. The air trapped in the cylinder,
on the return stroke of the piston, owing to the openings 9
being closed, escapes through the inlet ports 10 or 11 into
the valve chamber 6, on the outer side of the piston valves 7,
which will have now moved inwards far enough to place
said ports in communication with the atmosphere. When

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the engine is compressing air 'and thus acting as a brake,
the reversing lever of the slide valve is placed at the dead
point, so that the piston valves 7 are stationary, and the
ports 10, 11 are permanently closed by the said valve. The
air contained in the right hand part of the cylinder 8 (see
figs. 2 and 3) is compressed as soon as the piston which moves
from the left to the right has covered the openings 9. This
air under pressure lifts the valves 14, as soon as the pressure
becomes greater than that which exists in the valve
chamber 6. The valve 2, of the controlling valve 1, is
also lifted, and the air under pressure is forced into the air
supply pipe 5 and back to the supply. On the return of the
piston 8a the valves 14 close and the residue of air contained
in the dead spaces are first reduced to atmospheric pressure,
and then a vacuum is formed, an action which is assisted by
the cooling of the residue of air, so that when the openings 9
are again uncovered, further atmospheric air is drawn into
the cylinder and mixes with the residue left after oom-
compression. The fresh charge is cold enough to prevent
excessive heat during compression, even with a very heavy
degree of compression, excessive heat is avoided, and a
normal continuous working of the compressor is possible.
The sama action to that described takes place on both sides
of the piston, so that the action is continuous. (Four
claims.)

23654 (1912). Improvements in, or connected with, Breathing
Apparatus for use in Irrespirable Gases in Mines and other
Places. W. H. Hill, superintendent of the Rescue Station,
Howe Bridge, near Atherton, Lancashire, and R. H. Davis,
187, Westminster Bridge-road, London.—This invention
relates to that class of apparatus wherein an enclosed
volume of air is caused to circulate through a substance
which absorbs the carbonic acid contained in the expired
breath and wherein means are provided for introducing
pure oxygen from a cylinder or Cylinders of compressed
oxygen, carried by the worker for revivifying the air, and
the invention has for its object to provide a combined saliva
and moisture trap and cooler for use with the breathing bag
of such apparatus by means of which the expired air is
broken up and a large part of its moisture is extracted in
its passage through the trap, and by means of which the
air is cooled. The combined saliva trap and cooler comprises
an inner chamber and an outer chamber or jacket, the latter
being open at the top and the former being closed and
provided with a diaphragm from which depend a series of
tubes. A further tube is provided which passes through
the upper part of the inner chamber and is connected at the