Science: Volcano & Ice

New military techniques are where you find them. Last week Drs. M. Ewing and Frank Press, Columbia geophysicists, told how they discovered a practical method of measuring from an airplane the thickness of Arctic ice. They started by studying Krakatoa Volcano, near Java, which had its most famous explosion almost 70 years ago.

Ewing and Press had long believed that disturbances in the air cause waves in the land and sea. In search of proof, they selected as a "laboratory test" the 1883 Krakatoa eruption, whose mighty bang sent air waves seven times round the earth. One chapter in a fat report...

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