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... COMMUNICATOR SAYING IT WITH SMOKE WHEN an R.A.F. pilot from overseas was brought down in the Libyan desert, a hundred miles from his base, he owed his rescue to the knowledge of an ancient system of communica tion practised by the Redskins. Messages in the Sky These North American warriors used to send up smoke signals from their hide-outs in the mountains, based on a secret code. By skilfully ...