| Description | The file contains Theatre Projects Consultants Ltd correspondence with the client, contractors and consultants regarding scenery hoist installation as well as sketches and notes. Topics discussed include masking screen hoists and drive (payment of invoices, control desk, VDU monitor mounting, estimates and quotations, mechanism and support frame, motor unit, matrix room CO2 system, grid masking tracks, control panel functions, Evershed Power-Optics Ltd progress, drawing issuing); scenery hoists and power flying (panel control description, software, the Evershed Power-Optics programme and delays, standby system, testing and faults, sprag holding device, diagnostic programmes); point hoists (description and issues); the handover; the lower hoist system (cycloconverter room); diagnostic equipment; material costs; schedule of control devices; research trip to Vienna; personnel changes; instructions; ex-gratia payments; handbook data; servicing; modifications; spares; site supervision; and site access. Correspondents include Tele-Stage Associates Ltd; Evershed Power-Optics Ltd; Denys Lasdun & Partners; the South Bank Theatre Board; Davis, Belfield and Everest; Mole Richardson (Stage & Studio Engineering) Ltd; Sir Robert McAlpine & Sons Ltd; Chubb Fire Security Ltd; the National Building Agency (NBA); George Kent Ltd; Rowley Pemberton Roberts & Co Ltd; the National Theatre; the Greater London Council (GLC); and Flay Services Ltd. The file includes sketch number MS/1 'National (Upper) Theatre Masking Screen Hoists'; sketch number 904 SK - 864 'National Theatre Upper Masking Screen Assembly', a sketch 'National Upper Theatre Scenery Hoists - Standby System - Block Schematic'. The original card folder has been disposed of. '5 Scene Hoists Jan 75-Aug 76' was written on the front, and '904-5B2 the National Theatre Scenery Hoists File 5 Closed From 1.1.75' was written on the spine. |