A wireless instrument which will tell an airman just how high he is flying has been invented by Dr Alexanderson, the American engineer, who recently demonstrated his very successful method of television. This is a wireless echo machine. It sends a wireless wave from the aeroplane to the ground, which rebounds and is caught up again on the. dashboard. The return wave lights up one of a series of coloured lamps according to the time taken for its return journey, and from the colour of the lamp the airman knows his height.
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Otago Daily Times, Issue 20703, 29 April 1929, Page 16
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92Page 16 Advertisements Column 2 Otago Daily Times, Issue 20703, 29 April 1929, Page 16
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