| Description | The file contains Theatre Projects Consultants Ltd correspondence with various contractors regarding the drum revolve design and installation as well as file notes, diagrams and sketches. Topics covered include the hoist contract; the issue of drawings; rough sketches of parts of the drum revolve design; drum revolve slip rings; door locks, interlocks, notices and indicator lights; cable schedules; drum surround galleries; controls; payments for components; communication issues between sub-contractors and the National Theatre holding up the installation; scenery hoists and power flying; Greater London Council (GLC) requirements; orders and invoices; drive room; barrier rails; mimic mechanism; control desk; stage partitions; cycloconverter drives; commissioning; flooring; and warning horns. Other correspondents include Mole Richardson (Stage & Studio Engineering) Ltd; Evershed Power-Optics Ltd; Flint & Neill Ltd; Knowles Beckett & Associates (Consulting Engineers) Ltd; the Greater London Council (GLC); Denys Lasdun & Partners; Sir Robert McAlpine & Sons Ltd; District Surveyor Lambeth; Metropolitan Tool & Products Ltd; Hall Stage Equipment Ltd; Tele-Stage Associates Ltd; James Gibbons Ltd; and the National Theatre. The file includes sketches of a drum revolve panel on tracing paper and sketch D14-138 'National: Drum Revolve Surround Galleries'. The original card folder has been disposed of. '3 Drum Revolve July 73-May 74' was written on the front cover, and '904/5B1 3 Closed 31-5-74. Drum Revolve' was written on the spine. |