Owrng to the diminutlon of th» densrty of the atmosphere in proportion to the altitude and a corresponding increase in the average velocity of the wind, navigation of the air by aeroplanes or heavier than air machmes is considered impossible at heights exceeding 15,000ft,
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https://paperspast.natlib.govt.nz/periodicals/DIGRSA19200423.2.35.4
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Digger (Invercargill RSA), Issue 6, 23 April 1920, Page 8
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44Page 8 Advertisements Column 4 Digger (Invercargill RSA), Issue 6, 23 April 1920, Page 8
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