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Circuit diagram of the Moullin valve voltmeter (1922) showing method of calibration
Amateur transatlantic tests were successfully carried out on 200 metres, Wireless World organizing the arrangements on this side. Moullin described his valve volt-meter, the first widely used electronic device. Dull-emitter valves with a filament wattage about 1/15th that of earlier types were introduced and news of Armstrong's super-regenerative receiver came from America.
C S Franklin of Marconi's described an important development-the use of highly directional aerial arrays on wavelengths below 20m. But so far there was no suggestion that such waves were usable over very great distances.
Towards the end of the year the British Broadcasting Company, forerunner of the Corporation, began official transmissions. Wireless World started weekly publication.
'Messrs. W G Pye & Co (Makers of Physical and Electrical Apparatus) beg to announce that they have opened a Wireless Dept. at their works' (Advertisement from WW May 27th 1922). This unit was popular in the early broadcasting era
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