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AY. g Equipment is Operated on Time Swedish Docking Facilities HE wireless station at Stavan- ger, Norway, is worked on the timed spark system. The sparking machine makes 2080 revolu- tions per minute and produces 1650 sparks per length of 6% to 10 miles. The send- ing station is in Hetland, three miles from Stavanger, and the receiving sta- tion at Naerland, about 18% miles from Stavanger, according to O. Moe in Teknisk Ukeblad. The aerial gear of the sending sta- tion is supported on 10 tubular steel masts in sections bolted together, 24 insulated antennae wires are suspended between them, each consisting of 3500 feet of silicon bronze wire. The masts are calculated to resist' a tension of two tons at the top and, in addition, a wind pressure of 30 pounds per square foot. Each mast is stayed by 24 steel wire guy ropes carried to four equally spaced concrete foundations. The mast itself rests on a steel bedplate 7 feet 6 inches square, 2 inches thick, and held in position by 16 two-inch diameter holding down bolts, 6 feet long. The whole foundation material is built in a hole cut out of rock and made solid with cement. All guy- ropes are insulated and tested to a total tensile strength of 13. tons. A platform of checkered steel plate sup- ported on strong angles is fixed 5 feet below the top of each mast, together with pulley block, etc, for gaining access. Power is supplied from the Stav- anger hydroelectric power 'station in the Oltedale valley through an over-~ head transmission line delivering alternating current at a pressure of 5000 volts to a point 3300 feet from the wireless station. A cable with three strands each of 0.038 square inch area continues to a step-down trans- former station, which supplies the various requirements of the radio station. Three cables each of 0.97 square inch area conduct the low pressure current to a set of bus bars connected to the main switch board of the station. A special transformer is provided for heating the antenna wires in case they are covered with ice and snow. The energy for the closed-oscilla- tion circuit is produced by two con- tinuous current dynamos, each of 150 kilowatt, working at a pressure of 5000 volts. They are mounted on a common shaft and driven by a 500- second,, having a wave 'as to enable the duplex horsepower synchronized 3-phase motor. These generators run in parallel and have a common exciter, also mounted on the same shaft. The current generated passes' through bright copper wires mounted on in- sulators to a battery of electric con- densers on the second floor. The sparking machine is placed in a separate room, and an air compressor is provided to send a jet of com- pressed air, at a pressure of 40 pounds per square inch, against the electrodes of the sparking machine, through a mouthpiece with a narrow slit. Each condenser consists of a number of zinc plates separated by plate glass insulators, all joined together and placed in a stoneware tank filled with oil. A pair of condensers are joined in series, and these again in parallel by copper «conductors, which finally unite in 'broad copper bus bars, one leading to the primary winding of the jigger and the other to the spark gap. The Morse keys are worked from a small motor generator, which trans- forms 3-phase current to continuous current at 110 volts. _The keys are placed in the high tension circuit and not, as is frequently the case, in the low tension circuit. The two stations, 19 miles apart so system of working to be used, are so situated that their center lines are parallel and point towards the two corresponding stations in America. The receiving station is provided with eight masts S00 feet high, similar in design 'to those of the transmitting station, and placed in a straight line 984 feet apart. Their antennae consist of two insulated wires each 8500 feet long. In order to prevent the sending sta- tion from having any effect on the receiving station in Norway when working on the duplex system, a so- called balancing antenna is placed be- tween them. This consists of a single wire supported from 17 wooden masts 98 feet high, placed 500 feet apart, to form a straight line 8500 feet long perpendicular to the center line of the transmission antennae and at a dis- tance of about 1640 feet from the re- ceiving station, where it terminates in a system of wire netting and a con- denser. The receiving station is pro- vided with the latest type Marconi long distance instruments for simplex and duplex working, together with arrangements for the receiving of auto- 283 transformed at the works. Spark System by Hydroelectric Power--_ Are Improved--Launches Composite Ships matic messages on phonographic rolls. The power required for working the receiving station is obtained from a hydroelectric station at Jaederon through an underground cable. The current is used for charging a battery of accumulators with 60 cells erected lines in duplicate to the Royal Nor- wegian telephone stution at Naebo in a special building. The receiving station has direct telegraph lines to Christiania, Bergen, and_ telephone and to the transmission station at Ullenhang. e Improves Swedish Yard Two drydocks were built in 1896, at Oskarshamn, Sweden, one being 355 feet long and 49 feet wide with 15 feet depth of water on the sill, and a smaller one, 147 feet long, 7 feet 6 inches deep. .Both docks have one common entrance, and slipways have been arranged for repairing ships. up to 6000 tons deadweight. These are served by a system of electric cranes and winches. ' Berths for: building ships up to 10,000 tons deadweight have been recently arranged. The plate bending slabs in the yard are the largest in Scandinavia. The works are driven entirely by electricity from the Finsjé hydro- electric power station. The current is -- Tools are driven by electricity or compressed air. Steam is only used for heating the works. A special feature is made of a care- fully arranged steam kitchen, built during the war, where meals are served below cost price, the com- -- pany, in addition, providing food at reduced prices for the families of the workmen. This has proved a great success from every point of 'view.-- Teknisk Tidskrift. Launches Composite Ships The first Norwegian composite ship has been launched at Larvik. It is built of fir planks over a steel frame, has a carrying capacity of 650 tons and a speed of 9 knots. It is driven by an oil motor and can carry a fuel supply to last 12 days. Another sim- ilar ship was launched in March. Den- mark has already a composite ship which was built recently at Frederiks- havn.