By mid-1931, all motion picture studios were recording on optical soundtracks, but sets of soundtrack discs, mastered by dubbing from the optical tracks and scaled down to 12 inches to cut costs, were made as late as 1936 for distribution to theaters still equipped with disc-only sound projectors.
12.
A subsidiary of Gaumont British "'G . B . Equipments Ltd "'made a number of 16 mm film sound projectors in Britain before and during World War II, including models such as the G . B .-Scope A and B, Grosvenor and G . B . K and L series.
13.
Bayle has commented that the purpose of the Acousmonium is to " " substitute a momentary classical disposition of sound making, which diffuses the sound from the circumference towards the centre of the hall, by a group of sound projectors which form an orchestration of the acoustic image " ".
14.
Used variously as a gymnasium, theatre, cinema ( a cinematograph projector was installed in 1927, and replaced by a Movietown Sound Projector in 1931 ), assembly hall, recreation hall, chapel, and currently as a lecture room, the building was re-located in 1978 to a site between the inner and outer ring roads on the western edge of the campus.
