Folders B.25-B.28: Magnets. Folders B.25-B.26: '30MHz permanent magnet spectrometer c.1956/1957'. Contents of a folder so inscribed divided into two for ease of reference; recordings, circuit diagrams etc. Folder B.27: Further material regarding high resolution spectrometer; circuit diagrams, photographs of equipment etc. Some of the material is dated 1956 and 1958 Folder B.28: Photographs 'of a huge permanent magnet gap 1 1/2" field adjustable…