624

THE COLLIERY GUARDIAN.'

March 31, 1916;

sleeve or cylinder. A specific construction, according to the
invention, involves the use.of a telescopic water connection
passing through the stationary sleeve or cylinder of the
machine, and in communication at one end with a source of
supply, and at the other end with a port or passage leading
to the hollow drill. Fig. 1 is a longitudinal sectional eleva-
tion, showing one convenient construction of .rock drill, in
accordance ■ with the invention; and figs. 2, 3, and 4 are

cylinder. The object of the invention

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fragmentary' views, illustrating in' sectional elevation and ■
on a somewhat larger scale different portions of the device
shown in fig. 1. (Five claims.)

1863 (1915). Improvements in connection with Rock
Drills and the like. M. T. Taylor and E. A. Loring, of
Carn Brea, R.S.O., Cornwall.—Relates to improvements’ in
connection with rock drills of the hammer and telescope type,
that is, of the type in which a piston works freely within
a cylinder, the rear end of which or a rearward extension
of which is 'a fluid-tight fit within a stationary sleeve or feed
cylinder such that as the work progresses the distance
between the chuck or tool holder and the rear end of the
feed cylinder constantly increases, the machine being held
up to its work by the pressure of compressed air or other
fluid within the feed
is to devise im-
proved means for
maintaining the
feed cylinder fixed
in position which
can be easily and
rapidly manipu-
lated. The inven-
tion consists in
providing a rock
drill or the like of
the type referred to
with a holder
adapted to slidably
engage the feed
cylinder combined
with positive means
for connecting said
holder to the rear
part of the station-
ary feed cylinder in

such .a manner as to prevent rearward movement of the feed
cylinder relatively to the ' holder. . More specifically, the
invention consists in providing the rock drill or the like of
the type referred to with a holder in which the feed cylinder
is a sliding fit, and having a clip or. like fastening device
thereon so that a joint or other connecting member may be
positively secured thereto, and to, the rear part of the
stationary feed cylinder in order to prevent rearward move-
ment of the* machine relatively . to *'the holder while the
machine is in operation. The • invention also consists in
providing means when necessary fori preventing the forward
movement of the machine relativoVyyto the holder. Fig. 1
is a side elevation showing one convenient arrangement in
accordance with the invention ; figs.,’2 and 3 are respectively a
side elevation and end elevation on k somewhat larger scale
of a portion of the apparatus illustrated in fig. 1. (Four
claims.)

2736 (1915). Improvements in Machines for the Breaking
of Coal or other Friable Material. B. Norton, of Selborne,
Dudley, Worcestershire. — Relates to machines of the type
which have series of picks reciprocated in a vertical direc-
tion for breaking coal
or other friable
material on a con-
veyor. The invention
provides levers and
links in the form
of a parallelogram, to
give a vertical motion
to the picks. The
accompanying figure
is a side elevation of
a machine for break-
ing coal. The opera-
tion of the machine is
as follows : Upon the
cranked shaft C be-
ing rotated, the picks
P are constrained to
reciprocate vertically in a nearly straight line motion, but
always with their axes vertical. By this means, all the
large pieces of coal or other material moving on the conveyor
N are successively struck by one or the other row of picks
in such a position that the blow effectively splits the pieces.
(Four claims.)

2340 (1915). Improvements in Apparatus for Charging
and Discharging Gas Retorts, and. the like, and for Con-
veying Coal, Coke, Grain, Ores, and like Substances. W. J.
Fiddes, of 602, High-road, Tottenham, London, N.—Fig. 1
is a side elevation of an apparatus for charging and dis-

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charging gas retorts, and embodying .the invention, but with
some mechanism such as the engine and-gear for actuating
the apparatus and the appliances omitted; fig. 2 is a plan
of the mechanism for operating the telescopic tubes and
bar, and showing the position of the relative parts. The
action is as follows :—Power is applied to the drums 16, 16

to drive the chains 17, 17 together with the tubes 1, 1 to
which they are attached into and through the retort to the
furthermost end, and coal is delivered from the hopper 36
into the charging apparatus 9. The coal comes in contact
with the (screw 11, or other filling or thrusting. device, and
is thereby driven forward into the tubes 1, as they are being
extended to theiir. full length in the retort. As soon as the
tubes 1 have reached the furthermost end of the retort,

•the action of the drums 16, 16 is reversed-and the chains and
tubes are withdrawn, during which operation the tubes 1 are
telescoped together, the flap lid 6 opens, and a continuous
delivery of coal into the retort is effected, the screw acting
as a resistance to the coal. By regulating the speed of with-
drawal of the tubes of coal feed, the retort can be
either lightly charged or absolutely filled with coal as m^
be desired. If desired, the apparatus can push the coke out
of the retort by means of the usual push plate 7, in combina-.
tion with the shut flap lid 6, which willzprevent coke being
forced into the tube mouth. (Three claims.)

4096 (1915). Improvements in the Manufacture of Fuel
Briquettes. C. T. Clarke, of 173, Croy don-road, Anerley,
Surrey.—Relates to- the manufacture of fuel briquettes of the
kind employing paper waste in association with' coal and
with tar and pitch or like binding material; an example of
such a briquette which has heretofore been proposed con-
sisted of a mixture of one part of coal dust, with one.part of a
pulp of, for instance, equal parts of paper and fruit or
vegetable waste, to which mixture was added 10 per cent,
by weight of Trinidad pitch, and 10 per cent, of gas tar.
According to the invention, about two-thirds of the briquette
by weight consists of paper waste (or mixed paper and cotton
rag waste), used in conjunction with a’ proportion of small
coal or coal dust, amounting approximately to a quarter of
the briquette, the remainder being binding, material, such as
tar and pitch. The paper may be pulped or shredded or
ground into particles sufficiently small for close mixture with
the other ingredients. The coal and paper are preferably
first mixed together in any convenient type of mixing
machine, and the tar and pitch, suitably heated, are then
mixed in, and the resulting mass subjected to high pressure
in moulds, as in the present method of making briquettes. It
has been found that the following proportions by weight of
the various ingredients give a satisfactory briquette, but, of
course, the proportions • can be varied somewhat, consistently,
with the approximate figures given above : Paper, 62 parts;
coal, 24 parts; tar, 10 parts; pitch, 4 parts. (Two claims.)

5041 (1915). An Improved. Instrument for Recording Per-
centage Volumes of Constituent Gases. W. W. Crosweller,
of Mapledene, Kearslcy-road, Crumpsail, Manchester, Lan-
cashire. — Relates to an improved instrument for use in
of constituent gases, which
instrument is particularly
applicable as a carbon
dioxide (CO2) recorder. . An
instrument’ made in accord-
ance with the invention
•possesses a power vessel
operated by' water head, and
a gas buretter, so arranged
in relation to the power
vessel and a siphon used for
draining off water from the
power vessel that the gas
burette will always hold a
quantity of water, which will
become stagnant, and become
charged with any gas which
is soluble in water. The
power vessel is in direct com-
munication with the gas ’
burette, in known manner,
without intervening air lock,
or any controlling means or
mechanism, governing such
communication. Also, the
exact adjusting of the volume
of gas to be measured, and
the ultimate drainage of this
gas sample, is effected by the
medium of a single tube,

sealed directly by the rising of the water in the powder vessel.
The features necessitate the employment of only three vessels,
viz., the power vessel, the gas burette, and the absorption
vessel, apart from a float vessel and float, and the usual pen
gear, clockwork drum, -and recording chart. The accompany-
ing drawing shows the construction' of the improved instru-
ment as it would be made for a CO2 recorder. (Two claims.)

5513 (1915). Improvements in and relating to Miners'
Electric Safety Lamps. O. Oldham, of Denton, near
Manchester, Lancashire.—Refers more especially to lamps
of the kind provided with a screw-operated switch enclosed
in a flame-tight chamber (arranged at a suitable part of the
lamp case. Fig. 1 is a front elevation of an electric lamp
embodying the features of the invention; fig. 2 is a side
elevation, partly in section, of the said lamp ; and fig. 3 is
a plan view of the lamp case with the cover removed. The
body of the lamp comprises a cylindrical casing a into which
the battery b is adapted to be placed from the upper end
when the cover c is removed. The cover c is provided with
a depending flange c1, which is internally screw" threaded to
engage -a correspondingly formed threaded portion u1 of the
top of the casing, thus providing a flame-tight joint between
the cover c and the said casing a. The cover c is provided
with a locking bolt d, which is adapted as the cover is
screwed on, to slip past a fixed stop e inside the lamp casing,
which stop may also for convenience and reduction in the
number of parts, serve as one of the guides for the cell b.
The locking bolt d may be perforated and be secured by
means of a lead rivet or other seal passing through a hole f
in the boss g, or it may be operated by a magnet. The
switch is a simple screw stud h which enters a flame-tight
boss or chamber i on front of lamp casing a above the lamp
proper, and it is so arranged that it cannot be removed from
the outside of the lamp, but merely screwed an or out within
predetermined limits to control the lamp circuit. The con-
tacts j and k are enclosed within the lamp casing a in a
segmental shaped frame I of wood, ebonite, celluloid, or
other acid-resisting insulating material, and the inner flat
face of the frame may also for convenience act as a guide for
the cell b. The lens ring m, which is as usual screwed on
from the outside of the lamp casing a, is provided with a
flanged edge n, which when the ring m is screwed home is
adapted to be engaged by a notched bar o, which is screwed
up on to the lens housing p. This bar o prevents the lens
ring p from being removed whilst it is in position and in
order to prevent the unauthorised removal of the said bar
o the securing screw r is provided with a deeply recessed
hole $ for the head to rest in, and across this recess other

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perforations t are formed at right (angles thereto for the
passage of a lead rivet or seal adapted to prevent unauthor-
ised tampering with the parts by preventing unobserved
access to the head of the screw r. The cell b, which is of the
unspillable type, is preferably provided with nickel silver, or
other metal contacts u, u , which are so fixed by means of
antimonial lead nuts v, vl that the latter can be-used when
charging.the cells upon charging frame. The contacts u and
ul are resilient, and are adapted to engage with a pair of

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fixed contacts /' and kx, which are connected to the aforesaid
contacts j and k respectively by means of leads within the
block I. It will be understood that the circuit is completed
when the switch screw stud h engages the contact /, the
current flowing from one contaict j to the other k, or vice
versa, by way of the lamp and the mass of the lamp casing.
(Three claims.)

7709 (1915). Improvements in Rock Hammer Drills. F.
E. Kewley and J. A. Corner, both of 26, New Station-read,
Fishponds, Bristol.—Relates to a pneumatically operated
rock hammer drill of the type which is constructed from a
solid forging of steel, so that the cylinder is in one piece
with the operating handle. The invention consists in an
improved rock hammer drill having in combination a cylinder
and operating handle constructed in one piece from a solid

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liquid leaving at the periphery at a

forging of steel, a valve disposed at right angles to the axis
of the cylinder, a lubricating device arranged radially to
the cylinder with its axis in a plane with that of the
valve, and an elastic connection between the drill stock and
the cylinder. Fig. 1 represents a longitudinal sectional
elevation; fig. 2 is a part sectional elevation at line a—b
fig. 1; fig. 3 is an elevation at line c—d fig. 1, with certain
parts removed for the sake of clearness. (Two claims.)

15276 (1915). Improvements in the Impellers of Centrifugal
Pumps. Gf. R. Brown, 125, Trinity-road, Leith, Midlothian,
Scotland.—The liquid entering at the centre of the impeller
is thrown towards the periphery through independent tubular
legs in impeller solely by centrifugal force, and is discharged
into the casing at a higher pressure, and is whirled round by
the outside of the legs towards the discharge; therefore, these
legs are kept as long as practicable, so as to have a column
of liquid of fair
length inside the
legs, and also so
as to present a
good surface to
liquid outside the
legs, and thereby
increasing effici-
ency of both suc-
tion and delivery.
The legs in im-
peller are tapered
both internally
and externally,
so that the
motion of liquid
through legs is
kept uniform and
so preventing legs
being emptied
when impeller is
running at high
speeds, through t

higher speed than it would enter at the centre, this owing to
the different circumferential speeds as the distance from
centre increases. As the sides of impeller have to be a close
fit in casing, so as to minimise slip, it is necessary to have
sides of casing tapered to suit taper of impeller legs. To
further increase the efficiency, the centre of this type of
impeller is eccentric to the centre of casing, so that points
of legs just clear a point in casing near outlet, and so gradu-