Transport: Tropic Teeth

To a crocodile anything red and biteable is edible meat. Consequently, when Imperial Airways Ltd. began installing big, red, rubber buoys at stations in the Sudan and British East Africa (Malakal, Kampala, Kisumu) to moor their flying boats, crocodiles went for the buoys with enthusiasm, punctured and sank them. Last week, Imperial's engineers in London completed designs for a crocodile-proof buoy—a strong steel cylinder buffered with a semipneumatic fender impervious to tropic teeth.

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