GREAT BRITAIN: Million-Degree Heat

In matter-of-fact fashion, Winston Churchill last week told the House of Commons as much as he thought it should know about Britain's first atomic explosion, set off Oct. 3 off the Monte Bello Islands north of Australia. The bomb (he called it that for the first time) was detonated inside a warship — the 1,450-ton frigate, H.M.S. Plym—in order "to investigate the effect of an atomic explosion in a harbor."

Churchill continued: "Thousands of tons of mud and rock from the sea bottom were thrown many thousands of feet into the air, and a high tidal wave was caused. The...

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