. Practical wireless telegraphy; a complete text book for students of radio communication . is station is therefore of great interest to Americans as the communicating linkswith the New Jersey stations in the Marconi globe-girdling chain. In Fig. 304 are shown the blowers which furnish air under considerable pressure, to blowout the spark at the disc discharger and keep the disc elements cooled. These are also usedto blow out the sparks at the signalling switches which relay the dots and dashes to theaerial wires. In Fig. 305, the 300 K. W. ISO cycle motor generators at the Carnarvon station a
. Practical wireless telegraphy; a complete text book for students of radio communication . is station is therefore of great interest to Americans as the communicating linkswith the New Jersey stations in the Marconi globe-girdling chain. In Fig. 304 are shown the blowers which furnish air under considerable pressure, to blowout the spark at the disc discharger and keep the disc elements cooled. These are also usedto blow out the sparks at the signalling switches which relay the dots and dashes to theaerial wires. In Fig. 305, the 300 K. W. ISO cycle motor generators at the Carnarvon station are shownas installed ready for use. In the photograph. Fig. 306, are shown the signalling motor gen-erators and the disc motor starters at Carnarvon. One of each is a spare. The signallingmotor generator supplies current to work the high speed relay switches through which thestation is enabled to transmit from a distant operating station at the rate of 100 words aminute. The motor starters shown on the right control the 75 H. P. motors, which drive the 296 PRACTICAL WIRELESS Fig. 306—Special Signalling Generators at Carnarvon Station. disc discharger when it is disconnected from the main generator for as-synchronous , Fig. 307, gives a view of the high voltage transformers and primary induc-tances. All the current from the generators passes through the transformers, where it is stepped up to a voltagesufficient to charge thecondensers. The lowfrequency inductancesshown to the right of thedrawing permit a largerange of adjustment inthe primary power cir-cuits, thereby permittingthe radiated energy to becontrolled in accordancewith the 308 shows theswitchboard at the NewBrunswick, New Jersey,station. This board con-trols the generator cir-cuits, blower machineryand all controlling appli-ances within the receiving stationat Belmar, New Jersey,is completely equipped with a Marconi balanced crystal receiving set. Brown a
Size: 2071px × 1207px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
