904-7A the National Theatre Production Lighting File 4 from 1 April 1975 Oct 78

The file contains file notes with tables and diagrams, and internal and external correspondence with enclosures, mainly between Theatre Projects Consultants Ltd and Rank Strand Electric Ltd, regarding production lighting in the Upper and Lower Theatres (direct contract no. 5), specifically modulation panels, how to name the lighting control system (system 'x'), remote control systems, variations on the contract, electrical installation testing, request by Rank Strand Electric Ltd for an interim payment, lightboard training programme, lighting control desk communications facilities, invoicing, schedule of remaining work, heat dissipations and cooling units, auxiliary controls, concerns about cleanliness and environmental conditions in lightboard installation areas, working light wiring, dimmer rooms, insurance, changes in contract prices, teletype connections, emergency lighting, pin matrix installation, installation delays, loss of production lighting memory facilities, dimmer testing, client handover, safety lighting dimmer, VDU unit faults, warranties, failure of Rank Strand Electric Ltd to meet contract dates, operators' handbook, colour change equipment, lightboard power irregularities and final certificates and payments. Correspondents include Theatre Projects Consultants Ltd, Rank Strand Electric Ltd; Denys Lasdun & Partners; Flint & Neill Ltd; the South Bank Theatre Board; BEAMA CPA Advisory Service; Davis, Belfield and Everest; the National Theatre; Cinecita Private Ltd; and Sir Robert McAlpine & Sons Ltd. Items include a description of the features of the lighting control system (known at this stage as system 'x' as the name had not been decided upon), installation test sheets/certificates issued by Crown House Engineering Ltd, a seven-page narrative description [speech notes] of the process of designing and installing the lighting controls and a copy of sketch number 904 SK 1018 'Details of the Proposed Emergency Lighting Dimmer', temperature logs. 'Closed Oct 78' was written on the front cover, and '904-7A the National Theatre Production Lighting File 4 from 1 April 1975 Oct 78' was written on the spine.

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