1142

THE COLLIERY GUARDIAN.

May 28, 1915.

at the other with opposite sides of the spherical valve; two
exhaust ports arranged near and upon either side of the centre
line of the said cylinder, and a piston slidably mounted
within said cylinder, and adapted during operation to
alternatively cover and uncover the entrances to each exhaust
port. The accompanying drawing is a longitudinal section

23

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'21

10

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through a fragment of a rock drill constructed in accordance
with the invention, and with the piston disclosed in one
extreme position. Assuming the parts to be in the position
shown, it will be obvious that when compressed fluid is
admitted same will pass through the opening 19, valve
chest 13, passage 24, and thence into the cylinder 11. This
compressed fluid operating against the piston 12 will drive
the latter forward. During the initial forward movement of
the piston 12 the air in advance thereof will exhaust through
the port 25. After the piston has moved forward a certain
distance, the port 25 is covered, and the remaining air in
the cylinder in advance of the piston becomes slightly com-
pressed, and operates through the passage 23 to force the
valve 17 to its seat 18, which admits compressed fluid through
the passage 23 to the forward end of the cylinder 11 and
drives the piston 12 rearwardly. During the initial rearward
movement of the piston the port 26 is uncovered to permit the
necessary exhaust, and after the piston passes the port 26
in its rearward stroke the air between the piston and the
rear end of the cylinder is slightly compressed and operates
through the passage 24, valve chest 13 and opening 19 to
shift the valve 17 to the seat 15, when the operation (pre-
viously described is repeated. (Two claims.)

19402 (1914). Improvements in or relating to Apparatus
for Cooling Pistons. B. E. D. Kilburn, of Chancery Lane
Station-chambers, High Holborn, London, W.C. (A com-
munication from Gebriider Sulzer Aktiengesellschaft, of
Winterthur, Switzerland.)—Relates to apparatus for cooling
pistons, and has particular reference to apparatus of the
kind- described in the specification of British Letters patent
No. 24560 of 1910. In such apparatus, although the movable
pipe connected to the piston can be fitted with a fairly tight
joint into the stationary pipe leading to the cooling water

collector tank, it nevertheless happens sometimes that the
pipe secured to the piston carries with it particles of water
which come out at the upper end of the stationary pipe. In
order to pevent the said particles of water from getting
into the crank space of the engine, the .air-supply pipe is
carried, according to this invention, to the upper end of the
stationary pipe surrounding the pipe for supply of the
cooling medium. The air-supply pipe is therefore also
utilised for carrying away the cooling medium escaping at
the joint between the movable piston pipe and the stationary
enclosing pipe. A construction according to this invention
is shown in the accompanying drawing. (Two claims.)

20361 (1914). Improved Treatment of Sub-divided Ores for
Agglomerating or Reducing them and Apparatus therefor.
G. Grondal, of Djursholm, Sweden, and H. Nilsson, of
Nyhammar, Grangarde, Sweden.—Relates to a method for
agglomerating sub-divided or pulverulent ores with or without
reduction thereof, more particularly iron ore, into the form
of hard porous lumps or lumps of metal, and to a furnace
for operating this method. The sub-divided or pulverulent
ore is moistened to a suitable extent and packed into iron
receptacles of any suitable shape; for instance, slightly
conical, having both ends open. During this packing, or

after the packing, the mass of ore is provided with longi-
tudinal channels or passages through it. The receptacles
are arranged abutting against each other in a long horizontal
or slightly inclined series against a suitable fire-place or
burner, and the combustion products, either oxidising, inert
or reducing, as required, are led through the channels in the
whole series or furnace. As soon as the ore in the foremost

£

receptacle is brought into the desired state, this receptacle
is removed; the remaining receptacles are moved towards
the burner, and another receptacle, filled with fresh ore in.
the manner specified, is inserted at the end of the furnace,
and so on during the process. Fire-place receptacles or
burners may be inserted at suitable places in the series or
furnace. These fire-place receptacles or burners have the
same shape as the other receptacles, or any similar shape,
and each of them is provided with a fire-proof lining and an
opening, preferably a projecting short tube, capable of being
closed. Air under pressure is made to enter one end of the
furnace, and combustible gas, or any suitable combustible,
such as powdered coal, is fed through the short tube into
one of the fire-place receptacles. In this receptacle, the
burner, the combustion is effected, and the products of com-
bustion sweep through the channels in the ore mass in that
part of the furnace lying on the other side of this burner,
escaping at the other end of the furnace through a chimney.
Fig. 1 is a longitudinal section through the furnace, fig. 2
is a cross-section on line 2—2 of fig. 1, and fig. 3 is a cross-
section on line 3—3 of fig. 1. (Five claims.)

GOVERNMENT PUBLICATIONS.

**♦ Any of the following publications may be obtained
on application to this office at the price named post free.

Consular Reports, 1913: Italy, Trade of Milan, 4d.;
France, Trade of Saigon, 2Jd.; U.S.A., Trade of Galveston,
4d.; France, Trade of Algeria, 5Jd.

Finance Bill, No. 2, 2Jd.

Defence of the Realm (Amendment No. 3) Act, Id.

Accounts of Foreign Trade up to May 17, 4d.

Statutory Rules and Orders, 1915 : (No. 366), COAL
MINES SAFETY LAMPS ORDER, 3Jd.; (No. 386),
Trading with the Enemy Rule, March 13, 1915, l|d.

PUBLICATIONS RECEIVED.

An Introduction to Mining Science. By J". B. Coppock
and G. A. Lodge. London : Longmans Green and Com-
pany Limited. Price, 2s. net.

Coal Resources of Illinois : District I. (Longwall)
(Bulletin 10 of the Illinois Coal Mining Investigations of
the State Geological Survey). By G. H. Cady, assisted in
field work by K. D. White and others.

Coal Resources of Illinois : District VII. (Coal No. 6
West of Duquoin Anticline) (Bulletin 11 of the Illinois
Coal Mining Investigations of the State Geological
Survey). By F. H. Kay, assisted in field work by K. D.
White and others.

“Proceedings of the South Wales Institute of Engineers”
(Vol. 31, No. 2), price 5s.; “ The Institution of Mechani-
cal Engineers : List of Members, March 1, 1915, and
Articles and By-Laws ” ; “ Transactions of the North-East
Coast Institution of Engineers and Shipbuilders ” (Vol.
31, Part 1), May, price 5s.; “The Iowa Engineer,”
April; ‘ ‘ Proceedings of the Institution of Mechanical
Engineers, Parts 3-4, 1914”; “Monthly Bulletin of the
Canadian Mining Institute” (No. 37), May; “Annual
Statistical Report of the American Iron and Steel Insti-
tute for 1913”; “Transactions of the Institution of
Mining Engineers” (Vol. 49, Part 2), price 6s.; “Pro-
bable Effect of the War in Europe on the Ceramic Indus-
tries of the United States,” by A. S. Watts (Technical
Paper 99 of the U.S. Bureau of Mines); “Abstracts of
Current Decisions on Mines and Mining, December 1913
to September 1914,” by J. W. Thompson (Bulletin 90 of
the U.S. Bureau of Mines); “The Journal of the Chemical,
Metallurgical and Mining Society of South Africa ”
(Vol. 15, No. 8), MiarCh, price 3s.

THE ACQUISITION OF ENEMY PATENT RIGHTS.

The following list of British Patents, which have been
granted in favour of residents of Germany, Austria, or
Hungary, is furnished in view of the new Patents Acts,
which empower the Board of Trade to confer upon British
subjects the right to manufacture under enemy patents,
which right, when acquired, can be retained after the war,
and is specially compiled for the Colliery Guardian by Lewis
Wm. Goold, chartered patent agent, 5, Corporation-street,
Birmingham. It is desirable in the first instance to obtain
the latest particulars upon the Patents Register. If any
patent listed has been assigned to a non-enemy proprietor,
the law does not apply.

30110/12. Blasting. A blasting device comprises a hollow
cylindrical casing, closed at its ends, and pro-
vided with a longitudinal slot receiving a body
carrying a number of explosive cartridges elec-
trically ignited. A recess and ducts are
provided for the wires. The casing contains
water for the purpose of neutralising the flames
and preventing the ignition of the outside
gases. A key is provided, fitting a lug, for
adjusting the position of the apparatus in the
borehole. F. Kessler and F. Berger, Ger-
many (dated September 5, 1912).

834/13. Ammonium sulphate. To ensure the production
of neutral sulphate, the ammoniacal gas or
vapours are divided into two streams, one of
which is introduced into a part of the bath in
which an excess of acid is maintained, and the
other into a neutral zone of the same bath,
preferably in proximity to the place at which
the salt is withdrawn. H. Koppers, Germany.

961/13. Screw fans; mounting. The casing supporting
the motor and fan is oscillated about the bear-
ing by means of a worm-wheel driven from the
fan spindle, a pin on the wheel being coupled
by a link to a fixed pivot. The mechanism is>
wholly or partially enclosed within the motor
casing. P. Linke, Berlin.

1430/13. Quenching coke. Coke is quenched by being con-
veyed to a fixed water tank in a water jacketed
receptacle having inlet tubes through its double
bottom to admit the water to the coke. The
lower ends of the tubes are closed by a movable
plate before immersion to prevent access of air.
F. Meguin and Company and W. Muller, Ger-
many.

1569/13. Coke ovens. Vertical retorts are heated by inde-
pendently fired superimposed horizontal flues,
so connected up to the gas and air supply and
discharge conduits that the heating gases in
adjacent flues flow in opposite directions. Each
heating wall between a pair of retorts contains
two vertical sets of horizontal flues, supplied at
one end with gas from pipes and air from flues,
and connected at the other with outlet flues.
Air supply and outlet flues are provided at each
end of the retort, and the connections are so
arranged that in adjacent flues, both vertically
and horizontally, the gases flow in opposite
directions. The air supply is heated in ordi-
nary counter-current recuperators, and dampers
are provided in each flue for controlling the
admission of air and the exit of the products
of combustion. E. Hohmann, Germany (dated
March 14, 1912).

1596/12. Governors. To adapt any form of speed governor
for regulating at low speeds, and for either
direction of rotation of the prime mover, a
device is arranged between the prime mover
and the governor which adds a constant speed
on to the speed of the prime mover, so that the
governor runs at the sum of the two speeds,
which sum may have a positive value, even
when the direction of rotation of the prime
mover is reversed. Siemens-Schuckertwerke,
Berlin (dated January 19, 1912).

*** Copies of any of the above specifications can be
supplied at the price of Is. post free.

North Staffordshire Institute of Mining and Mechanical
Engineers.—A general meeting of the members of this insti-
tute will be held on Monday, May 31, in the Central School
of Science and Technology, Stoke-on-Trent, at 5 p.m. The
following paper will be read :—“ Notes on Sampling,” by
Mr. T. W. D. Gregory, F.C.S.

Hull Coal Exports.—The official return of the exports of
coal from Hull abroad for the week ending Tuesday, May 18,
1915, is as follows :—Aalesund, 25 tons; Bandholm, 2,084;
Christiania, 196; Drontheim, 177; Dieppe, 1,985; Gothen-
burg, 4,264; Genoa, 3,790; Havre, 1,327; Honfleur, 543;
Haugesund, 433; Landscrona, 1,187; Oxelosund, 947;
Rouen, 13,184; Stockholm, 1,643; Sakskjolbing, 2,394;
Stege, 1,067; Tuborg, 1,389; Treport, 1,403—total, 38,038
tons. The above figures do not include bunker coal, ship-
ments for the British Admiralty, nor the Allies' Govern-
ments. Corresponding period May 1914—total, 92,297 tons.

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