barometrically

They discover that bomb's arming device is barometrically activated.

The supercharger was fairly advanced for the era in that it used a barometrically controlled hydraulic clutch (fluid coupling) which allowed the system to automatically compensate for changes in altitude.

When I asked him if the steel liner was cretonically and barometrically sealed (I made these terms up), he assured me that it was and said he would mail a certification attesting to the "cretonic" and "barometric" status of the liner.

It remains that the State Department had received a detailed description of the barometrically triggered bomb from the Germans in November 1988 and received the Helsinki warning pinpointing particular Pan Am flights from Frankfurt in December 1988, all well before Lockerbie.