| Description | The file contains correspondence and enclosures as well as handwritten file notes and meeting minutes regarding various pieces of stage equipment, with a particular focus on noise levels in discussion with acoustical consultant Henry R Humphreys ARIBA, and the safety and licencing of the mechanical and electrical installations in discussion with the GLC, but equipment is also mentioned in other capacities. Specific subjects covered include the safety curtain for the Lower Theatre, advice on permissible noise levels in theatres, auditoria acoustics and sound insulation, variable speed hoists for scenery and how noisy they are, equipment firms and manufacturers who might be suitable for making stage equipment, hydraulic installation, drum revolve noise level, drum revolve partitioning and safety rails, drum revolve loadings and stability, drum revolve sound absorption treatment and cladding, drum revolve flooring and trip wires, fire escapes, lifts, TV outside broadcasts, sound insulating doors, control room window insulation, bar flying installation, safety lighting and creating 'blackout' conditions, lighting hoists, Upper Theatre gallery handrails and cat ladders, Upper Theatre smoke vents, Lower Theatre power flying, production lighting socket outlets, stage floors, general (foyers, corridors and lobbies) and auditorium lighting, stage elevators, motor isolation, roller shutters for projection rooms and fire doors. Correspondents include Henry R Humphreys ARIBA, C G Sparks Esq, Flint & Neill Ltd, E R Laithwaite of the Imperial College of Science and Technology, Eric Langham Esq, Donald Smith, Seymour & Rooley, the BBC, E P Peregrine Esq, Greater London Council (GLC), Mole-Richardson (Stage & Studio Engineering) Ltd, Denys Lasdun & Partners and Evershed Power-Optics Ltd. Items include an application for permission to provide a two-art safety curtain for the Lower Theatre. Original card folder disposed of. '904/3D Consultants Acoustic and Others. File CLOSED 28th February 1974.' was written on the spine. |