ECHO OF WIRELESS WAVE
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 a series of coloured lamps according to the time taken for its return journey, and from the colour of tho lamp tho airman knows his height. 4
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Bibliographic details
Manawatu Times, Volume LIV, Issue 6887, 17 April 1929, Page 2
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95ECHO OF WIRELESS WAVE Manawatu Times, Volume LIV, Issue 6887, 17 April 1929, Page 2
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