428

THE COLLIERY GUARDIAN.

March 3, 1916.

CONTRACTS OPEN FOR COAL AND COKE.

For Contracts Advertised in this issue received too late
for inclusion in this column, see Leader and Last
White pages.

Abstracts of Contracts Open.

Carlisle, March 15.—Coal, for the Carlisle Education
Committee. Particulars from A. H. Collingwood, clerk,
Chief Education Office, 15, Fisher-street, Carlisle.

Coventry, March 13.—About. 1,250 tons, or alternatively
2,500 tons of engine coal, for the Sewage Farm Committee.
Forms from J. E. Swindlehurst, city engineer and surveyor,
St. Mary’s Hall, Coventry.

Eastry, March 6.—Coal and coke, for the Guardians.
Forms from the master of the workhouse at Eastry.

•Gainsborough, March 11.—Coal, for the Urban District
Council. Forms from S. W. Parker, engineer and surveyor,
Council Offices, Gainsborough.

Limerick, March 7.—200 tons best through-and-through
steam coals, for the Committee of Management of the
District Lunatic Asylum. Forms from the storekeeper’s
office.

London, March 10.—Coal and coke, for the East Ham
Corporation. Forms from town clerk.

Preston, March 11.—Steam coal, for the Eural District
Council. Forms from A. W. Chrystall, surveyor, 160,
Walker-street, Preston.

Rochdale, March 8.—Engine slack and smithy coal, for
the Council. Forms from borough surveyor, Town Hall.

Southampton, March 9.—Cobbles and gas coal, for the
Corporation. Forms from the waterworks engineer, French-
street , South ampton.

Thames Ditton, March 7.—Abercrave anthracite bean
coal, for the Esher and Ditton Urban District Council.
Forms from the surveyor, Council Offices, Portsmouth-road,
Thames Ditton.

Wembley (Middlesex), March 15.—Coal and coke, for the
Urban District Council. Forms from F. W. Rodd, Public
Offices, High-road, Wembley.

The date given is the latest upon which tenders can be
received.

CONTRACTS OPEN FOR ENGINEERING, IRON
AND STEEL WORK, Ac.

Edinburgh, March 13.—Steelwork.— Steelwork required
in erection of structural steelwork at the new Portobello
electric generating station, for the Corporation. Specifica-
tions from Sir Alex. Kennedy, 17, Victoria-street, London,
S.W.

Faversham (Kent), March 20. — Oil Engines. — A
25-b.h.p. oil engine and two sets of’pumps, for the Rural
District Council. Specifications from H. H. Humphreys,
28, Victoria-street, London, S.W.

Melbourne, April 9.—Electrical Plant.—Complete plant
for impregnating electrical apparatus, for the Victorian
Railway Commissioners.*

Plymouth, March 23'.—Pipes, etc.—About 27 tons of
33 in. steel pipes and specials, for the Corporation. Specifica-
tions from F. Howorth, waterworks engineer, Old Guildhall,
Plymouth.

Swansea, March 6.—Mains.—Laying about 7,300 yds. of
steel water mains, 10 in. diameter, for the Corporation.
Specifications from borough engineer, 13, Somerset-place,
Swansea.

* Specifications, particulars, etc., may be seen at the
Commercial Intelligence Branch of the Board of Trade,
73, Basinghall-street, E.C. ■

Lectures on Coal.—The seventh lecture of the course by
Dr. Marie Stopes at University College was held on Tuesday,
29th ult., the subject being the chemical composition of coals
of various sorts, and their comparison with corresponding
plant analyses. A number of sample analyses of British and
American coals were quoted, and the lecturer regretted that
in so many of the analyses the oxygen and nitrogen con-
tents were “ lumped,” also that the sulphur contents were
not given in the long and useful tables of analyses published
by our Survey. Attention was drawn to White’s work on
the effect of oxygen in coals, and his opinion quoted to the
effect that oxygen and ash were about equally deteriorating
to the coal as fuel. In connection with this, the capacity
of lignites to absorb oxygen from the atmosphere was noted as
a great drawback to them as fuel. A German lignite absorbing
11 per cent, of oxygen in a wTeek on exposure to air wTas cited
as an extreme case of what happens in the case of many rather
low-grade fuels during lengthy shipment or exposure. In
dealing with the sulphur contents, samples were exhibited,
showing the disintegrating effect of the oxidation of sulphide.
Attention was drawn to the recent work of Lomax on the
presence, in some coals, of microscopic deposits of sulphur in
peculiar forms. The further analyses of the ash contents of
coal were compared with the analysis of the ash of species of
Lycopodium, which genus is unique in having from 20 to
nearly 60 per cent, of alumina in its ash, whilst in a great
many plants no alumina is present, and in those containing
that substance the proportion is generally under 1 to 3 per
cent., reaching in very few cases as high as 6 or 7 per cent.
In the case of coal where the analyses are carefully made
from the coal itself, the clay partings being avoided, it is
fair to assume that the whole of the ash is from the plants
which originally composed the coal, and iin this connection
the affinity between the living Lycopodium and the giant
Lepidodendrons ■ and Sigillarias which were such an
important element in the coal-measure flora, is highly sug-
gestive of the conclusion that these early Lycopods had the
same power of absorbing aluminium salts into their tissues
and that this accounts for the high alumina in the ash of
some pure coals. The lecturer pointed out the need for
detailed analyses of small selected portions of many coals,
for comparison with the palaeontological evidence; only by
such correlated work could a real knowledge of coal and the
substances in it be obtained. (The next lecture will be on
March 7, at 5 o’clock, on “ The Coal Resources of this
Country, France, Russia, and Germany.” Admission free
to those interested in mining.)

ABSTRACTS OF PATENT SPECIFICATIONS
RECENTLY ACCEPTED.

85 (1915). Improved Apparatus for Discharging - Coke
Hoppers or the like. A. McD. Duckham, of Waseda,
Highfield, Ashtead,/Surrey.—Relates to apparatus for. dis-
charging coke hoppers or the like, in which the discharge
chute is a cylinder rotating on an axis, inclined at an angle
which, permits the discharge of the coke, when the cylinder
is set in rotation, but not when the cylinder is stationary.
Owing to‘the rotation, the coke travels downwards, arid is
delivered without the breaking action which is inseparable
from a worm conveyor. When the apparatus is for use in
conjunction with a bucket or like conveyor, the latter drives
the cylinder, and there may be an intermediate revolving
chute adapted to receive the coke and to discharge it into the
conveyor buckets as they arrive in turn below the chute.
Fig. 1 is an end elevation and fig. 2 a side elevation. The
hoppers a are mounted in a frame b, which runs on rails c
at the sides of the conveyor pit. The inclined cylinder d,
which forms an extension of the lateral discharge opening



io!

J

of the hopper, is mounted at its inner end on four rollers e,
carried by the hopper, and at its middle on two rollers f
carried by brackets on the framing. It is driven by a belt
g from a pulley h, itself driven from the conveyor chain i
in the following manner. The chain engages a toothed ring
k surrounding the cylinder d, and provided with a bearing
ring I, whereby it is carried on three rollers m, one mounted
on brackets n on the hopper and the others on the bottom
member of the framing. To the bearing ring is fixed an
annular belt pulley o, through which is driven the shaft of
a gear wheel p engaging a toothed wheel on the shaft of
pulley h. Co-axial with the ’ toothed ring k, and fixed
thereto is a drum q, having on its periphery five discharging
mouths r. The open ends of the drum are of sufficient
diameter to admit the discharging ends of the cylinders d.
This drum q acts as an intermediate chute, and the pitch of
the toothed ring k is such that as each discharging mouth r
turns into its lowest position there is a bucket s in position
to receive the coke. (Four claims.)

4730 (1915). Improvements in Hammer Rock Drills.
W. E. Kimber, of 62, Charlton-road, Blackheath, Kent.—
Relates to improvements in hammer rock drills, and consists
in the special arrangement for imparting the desired rotary
movement to the bit or tool, and also for allowing either
water under pressure or compressed air, or a combination of
the two, to pass along a hole bored in the bit into the bore-
hole to allay the dust and remove debris. Fig. 1 is a longi-
tudinal section of the complete drill; and fig. 2 a similar

Lg2.

section, on a larger scale, of the piston or hammer cylinder
and the tappet or anvil on which same operates, and consti-
tuting the chuck carrying the bit or tool. The piston 1
constitutes the drill hammer, mounted to reciprocate in the
drill cylinder 2, upon a central rod 3, the ends 4 and 5 of
which are of square or similar section, to engage one (4) with
the rear end of the chuck 6, the forward end of which receives
the stem of the bit or tool 7, whilst the opposite end (5)
engages a rearwardly extending sleeve 8, capable of rotation
in relation to the drill cylinder 2, with which it is in axial
alignment. The sleeve 8 extends into a tubular part 9,
secured by the clamp 10, so as to constitute part of The
frame or support of the drill, and which in operation remains
stationary, while the sleeve 8, and with it the bit or tool 7,
is capable of both rotary and longitudinal movement in rela-
tion thereto. The rear end of the tubular part or drill frame

9 has a spindle 11 mounted therein, and fitted with a hand
crank 12, said spindle extending forward and engaging the
sleeve 8 (connected with the rear of the drill cylinder 2) in
such a way as to cause same to rotate under the action of
said crank. The movement imparted to the crank 12 will
be transmitted to the sleeve 8, causing same to rotate within
the drill frame 9, and also within the cylinder casing 2, with
which its rear end is connected, said movement in turn being
transmitted through the rod 3 upon which the hammer piston
1 reciprocates to the bit chuck 6, and so to the bit or tool 7. ’
The ends of the red 3 fit loose in the recesses in the sleeve 8,
and the bit chuck 6, so as to permit of slight adjustment. A
piston valve 13 works in a valve casing consisting of two
flanged members 20, 20% and a tubular member 20b, the
parts being held in position by a spring 14; said valve 13
controls the supply of motive fluid entering at 15 to the
passages or ports 16, 17, leading to the ends of cylinder 2,
in which the. piston 1 reciprocates on rod 3, while the cylinder
casing 2 is provided with exhaust ports 29, 30, permanently
opened to exhaust. The spindle 11, which extends into the
tubular drill- frame 9, only engages tbe rear part of the
sleeve 8, a clearance 18 being left beyond such point of
engagement. This space 18 is through passage 19, perma-
nently open to the pressure of the motive fluid in the valve
chest 20; and a passage or leakage 21 allows same to pass
to the rear of the tubular drill frame 9. The rear end of
the sleeve 8 is provided with packing rings 22, and constitutes
a piston working in the tubular frame 9; and the pressure of
the motive fluid exerted on the rear thereof by forcing said
sleeve 8, and with it the drill cylinder casing 2, forward in
relation to such tubular frame, will keep the drill 7 to
its* work. The stem of the bit or tool 7 is provided with a
screwed part 23 to engage a thread in the fore end of the
chuck 6 ; and a rearward extension 24 from the said screw
engages with and abuts against the bottom of a socket in
said chuck. The compressed air or water under pressure, or
both, to be supplied to the bore 25 of the drill 7 for allaying
the dust and removing the debris from the borehole is con-
veyed to an annular recess 26 formed in the part of the
casing 2, in which the chuck 6 is mounted, from which
recess 26 a hole 27 is pierced inwards to the centre of the
bottom of the socket, so that said fluid can pass into the
central hole 25, and out through openings at the end into
the borehole. A squared part 28 on the drill stem forward
of the screwed part 23 permits of the screwing home of the
bit to its seat in the chuck, and its release when desired to
remove the bit. (Six claims.)

6732 (1915). Regulating and, Safety Apparatus for Boiler
Feed Pumps. Gebroeders Stork and Company, of Hengelo,
The Netherlands. — Relates to a regulating and safety
apparatus for use in connection with boiler feed pumps. With
this device a constant over-pressure is secured at’the delivery
side of the pump, and the racing of the pump, in event of a
fracture in the delivery piping, is prevented. This over-
pressure is necessary to overcome the resistance in the piping,
valves, economisers, etc. The device relates to the type of
apparatus in which the steam inlet to the pump engine is
regulated by means of a piston equilibrated by the pressure
of the steam and a spring co-acting on one side opposed by
the pressure of the feed water acting on the other side. An
increase of the feed water pressure causes the piston to move
against the steam pressure, which movement is used to
partially cut w off the steam inlet to the pump engine. The
accompanying drawing shows the pump, steam turbine-
driven. A cylindrical piston 1 is guided in a bush or lining
2, fixed into a body 3. By way of a valve rod the top end ,
of this piston 1 is connected to a Valve 4, which, when closed,
rests on a valve seat 5. To the bottom end of the piston 1
a cup 10 is fixed, by means of
it-serves as seat to a spring
11,. ..locked between the
same, and a ring-shaped
seat of the body 3. The
bottom end of the body
receives a cover 12, with
a guiding bush 13 in the
centre, through which the
pin 14 of the reliever 15
passes. By raising the
handle 16 of the knee-lever
17 of this reliever, so that
it rests with its surface on
the bracket 18 of the cover
12, the pin 14, and with it
the piston 1 and the valve
4 are lifted. In the draw-
ing, this position is shown
dotted. The steam is let
into the ■'apparatus at the ■
top end, and passes, by
opened valve 4, through a
cage 6, and the ports 7 and
8 to the turbine. These
ports 7 and 8 are each con- _
nected to one or more
nozzles of the turbine,
whereby the ports 7 cannot
be shut (apart from the
cut-off of the complete
apparatus by means of
the valve 4), and merely
serve to start the turbine
with unloaded pump, while
the row of ports 8, connected to a second set of nozzles, can
be closed by the piston 1 to regulate the speed of the turbine,
in accordance with the quantity or rather of the pressure of
feed water delivered. With the running up of the turbine
the pressure of the. water at the delivery side of the pump
entering through the hole 19 increases. As soon as this
reaches a certain limit, the piston will be kept in balance,
and no longer rests on the reliever pin 14, so that the same
may be dropped. The top end of this pin falls upon its seat-
ing on the bush 13, and prevents leakage. At this moment
the ports 8 are free; as soon as the water pressure attains
the prescribed height, the piston will be moved upwards, and
the ports 8 partially shut. In some cases, i.e., if no water is
fed into the boiler, the passages 8 are cut off entirely. In
this way the required over-pressure of the feed water y is
obtained automatically, and the turbine speed is regulated.
The ports 7 remain constantly entirely open, to ensure a
maximum efficiency of the steam from the respective nozzles
in the turbine; the steam from the second row of ports 8,
however, will, have an efficiency in proportion if the pump
does not run at full load. The dimensions of the ports 7 are
such that the pumping engine cannot run away as long as
the pump receives water. (Five claims.)

22769 (1914).
Exhauster. J.

a nut 9, in such manner that

6

10

/

Qo





An Improved Rotary Compressor or
Johnston, and the Globe Pneumatic