ABSTRACT
Amid all this unpleasant political upheaval, technical progress was still being made. The diode valve was beginning to replace the magnetic detector in some installations, or alternatively was being fitted as a standby. From 1911 onwards some naval vessels and various shore stations were fitted with 3 kW and 5 kW tuned spark-transmitters based on Marconi’s synchronous disc discharger patents of 1907–9, these providing not only a more powerful signal but one which gave a musical note and therefore was more easily read through static interference.
