Spectrum

-- Basking in the warm afterglow of the First International Conference on Peaceful Uses of Atomic Energy and its eager exchange of atomic information, more than 100 scientists from 32 nations stopped on the way home to tour Britain's atomic-research center at Harwell, where they were "shown as much as possible within the bounds of security." Among the visitors to the center: 15 Soviet physicists.

-- A North American F-100C Super-Sabre, piloted by Air Force Colonel Horace A. Hanes. ripped over a straightaway course near Palmdale. Calif, to set the world's first supersonic speed record: 823 m.p.h. Although other jets have broken the sound barrier in level flight, their speed has not been checked for the record. For the F-100C trial, the observers had specially designed cameras and clocking equipment on hand.

-- The U.S. Army's Bell XV3 Convertiplane, a winged aircraft that can alternate between vertical and horizontal flight, made its first flight at Fort Worth, Texas. The plane made only a partial test, ascending helicopter fashion to a height of 20 ft. Powered by two rotors that can switch from vertical to forward position in 10 to 15 seconds, the plane combines a helicopter's maneuverability with the speed (Convertiplane: about 175 m.p.h.) and range of fixed wing aircraft.

-- To its routine daily report of conditions aloft, the Los Angeles Weather Bureau added an item in keeping with the age: a reading of the pattern that nuclear fallout would follow in the prevailing winds. Twice daily, the bureau will release fallout bulletins. Purpose of the service: to prepare authorities to 1) regulate evacuation routes in case of an attack, and 2) give advance warning to communities along a bomb's fallout trail.

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