—Even vilien the ground is obscured by thick fop;, a series of explosions like a machine gnu’s rat-a-tat-tnt within a plane’s undercarriage telis an airman his exact height in a new- device to be installed on h reach aircraft. The echo from the ground is picked up by electric sound detectors which gauge the craft’s altitude, and the device is said to give accurate measurement to within one foot from the ground. Woods' Great Peppermint Cure, for Chraren s Hacking Cough.—Advt.
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Otago Daily Times, Issue 20704, 30 April 1929, Page 6
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81Page 6 Advertisements Column 3 Otago Daily Times, Issue 20704, 30 April 1929, Page 6
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