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While concentrations varied daily, typical concentrations of lead particles ranged from 0.6 to 1 microgram per cubic meter of air, Bell and her thesis adviser Catherine Cahill found.

Even off the air, Bell sounds and looks like a hood just back from escort duty on a one-way ride.

The three engines are H.T.&T. assisted-vacuo Fleury turbines running from 3000 to the Limit—that is to say, up to the point when the blades make the air "bell"—cut out a vacuum for themselves precisely as over-driven marine propellers used to do. "162's" Limit is low on account of the small size of her nine screws, which, though handier than the old colloid Thelussons, "bell" sooner.