The Vulcan Shows Its Paces -- Flashing over the crowd at the flying display and exhibition here is the A.V. Roe Delta Vulcan, a four jet-engine bomber, which is in 'super-priority' production for the R.A.F. The Society of British Aircraft Constructors' show officially opens tomorrow, although the public will not be admitted until Friday. September 7, 1953. (Photo by United Press Photo).;The Vulcan Shows Its Paces -- Flashing over the crowd at the flying display and exhibition here is the A.V. Ro