| Description | The file contains correspondence and enclosures, file notes and test certificates, and mainly relates to making and installing power flying equipment but also occasionally to other stage equipment: Lower Theatre commissioning, Lower Theatre control equipment (control boxes), Lower Theatre panel, the lighting ladder set, wagons, rear stage wagon (locks and brakes), the revolve, torque spanners, cable tension, brake lights, temporary cyclo-drive, elevators, drums/disc systems, potentiometers, tachogenerators, synchro, assisted counterweight controls, side stage trolleys, house tabs, point hoists and lighting hoists, floor finish on front stage elevators, power flying motors, temperatures in the Lyttleton electronics room, resetter gear . Also discussed are the issuing of handbooks and maintenance manuals, insurance, testing, noise levels and problems with sub-contractor Hall Stage Equipment Ltd, including delays to works and works outstanding, concerns about quality of work and defects, the availability of the stages, equipment failures, and disputes over contract extensions, completion and payment. Correspondents include Theatre Projects Consultants Ltd, Evershed Power-Optics Ltd, Hall Stage Equipment Ltd, Sir Robert McAlpine & Sons Ltd, the National Theatre, British Ropes Ltd, Denys Lasdun & Partners and Davis, Belfield and Everest. Items include a draft report on testing power flying units in the Lower Theatre; drawing number Y 26809 'CB2A Unit - EPO 101/1B'; a letter exchange about a lack of supervision of Hall Stage Equipment Ltd workers; a sketch of a proposed temporary control panel; a report on the cancellation of dress rehearsals due to power flying failures; a letter to Peter Hall from Richard Brett regarding the possibility of aborting the Lyttelton flying system; two copies (one received by Theatre Projects Consultants Ltd and the other by Sir Robert McAlpine & Sons Ltd) of a claim against the National Theatre by Hall Stage Equipment Ltd for losses incurred due to delays, a rough sketch 'Lyttleton Theatre Power Flying Brake Microswitch Arrangement', a report titled 'Lyttleton Theatre Noise Investigation Power Flying System' and graphs showing test results on losses in tension of the power flying traction cable. Original card folder disposed of. '3 Power Flying Oct 75-Oct 77' was written on the front, and '904/5B5 National Theatre File 3 Powered Flying Equipment from 1 Oct 1975 closed' was written on the spine. |