| Description | The file contains correspondence and enclosures, file notes, daywork sheets and a damaged electrical part relating to lighting hoists, including modifications, tests, damage resulting from operator error, council certificates, lighting windlasses, operating failures and incidents, parts of a damaged spectrol reliance potentiometer, repairs, overload trips, Olivier point hoists, and operating and maintenance instructions. Correspondents include Theatre Projects Consultants Ltd, Sir Robert McAlpine & Sons Ltd, Hall Stage Equipment Ltd, the National Theatre, Evershed Power-Optics Ltd, the South Bank Theatre Board, Greater London Council (GLC) and Denys Lasdun Redhouse & Softley. Items include timesheets submitted by Hall Stage Equipment Ltd, the operating instructions for the Olivier Theatre lighting hoists, small photocopies of 3 sketches - number Y26800 'Lighting Hoist Connections Schematic' and two copies of number Y-90 or W-713 'Lighting Hoists National Theatre' and insurance reports on Olivier point hoists and lighting hoists. Original card folder disposed of. '904-5B10 National Theatre Lighting Hoists Opened 8th August 1977 2' was written on the spine. |