The BBC had preview theatres to run 16 mm sepmag film and 35 mm. The 16 mm machines were Bauer and the 35 mm projectors Kalee 21. The projection area was a long room (open plan) with projectors serving theatres E -J. There was a separate projection room in the same area for theatre K, which was 35 mm. There was also a dubbing theatre B, where 16 mm productions would be dubbed, and film dispatch and sound transfer suites, where the quarter-inch tape from Nagra tape machines would be transferred to 16 mm magnetic film. Film previews ran rushes, cutting copies, synch rushes, answer prints and transmission prints before going to telecine.