The Lid Comes Off Boscombe Down -- An air blower whips up a wind of 250 M.P.H. as the hood of a Vulcan aircraft undergoes jettison tests at the Ministry of supply aeroplane and armament experimental establishment here. Boscombe down is the ministry's official testing centre, and it is here that all new aeroplanes intended for the services, their armament and much of the equipment fitted in then are tested to determine how well they will do the task for which they have been designed the ministry