Letter from Thomas Gold to A S Dunbar, Manager, Electromagnetics, Lockheed Missiles & Space Company, California Thanks Mr Dunbar for his letter, which is being considered by the technical committee. Says that they will tell him what the opinions are concerning 'the applicability to the Arecibo system'. Says that Mr Dunbar has to understand that they 'work with a lot of conditions placed on any replacement feed by the heavy mechanics and features specific to the Arecibo installation, which might not be limitations for the case of other spherical dishes'. 2 September 1965