| Description | Bundle of letters, notes, and quotations (from Tele-Stage Associates Ltd incorporating Mole Richardson (Stage & Studio Engineering) Ltd, and from Loxton Engineering Services) with drawings relating to 'alternative drives' for the drum revolve (a back-up to the existing control system). Drawings include D14/460 'Proposed Stand-By Winch For Turning N.T. Drum Revolve' and D14/459 'Proposed Stand-By Drive Unit for Elevators on N.T. Drum Revolve'. |