Whoever thought when he Haloo-o-o-o-ed across some open and a second later lieaid the echo come back o-o-o-o, that any use could be made of this interesting phenomenon? A new instrument,, capable of recording the altitude of aeroplanes to .within .one foot of the ground has recoTitly. been installed on French aircraft for use in foggy weather. An arrangement under the 'plane makes a series of explosions. Electric sound detectors pick up the echo from the ground and the height of the 'plane is gauged therefrom.
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Evening Post, Volume CVII, Issue 55, 8 March 1929, Page 4
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86Untitled Evening Post, Volume CVII, Issue 55, 8 March 1929, Page 4
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