|Description||Very little remains of what must once have been an extensive correspondence on particle disintegration and cosmic rays. The little that is left, and which is presented below, has been extracted from miscellaneous folders found elsewhere in the collections; it is presented in chronological order, with an indication of contents.|
Correspondence found with the working papers and notes in Section B has been left in situ and itemised in the entries for the relevant folders. The majority of the letters thus preserved are usually isolated items, or an exchange of letters over a brief period, which have survived largely by chance. Attention is drawn, however, to the following more extended sequences, of some historical interest: B.42-46, extensive correspondence on the electro-magnet and cloud chamber erected o the Pic du Midi in 1948-1949 and the observations recorded there; B.48, an important and interesting exchange of letters between Blackett and C.D. Anderson of the California Institute of Technology in 1949-1950 re the newly-discovered and as yet un-naked V-particles, and their nomenclature.
Some of the correspondence in section J. marginally refers to work on particle disintegration and cosmic rays. See the birthday message to Blackett from B. Rossi (J. 76) recalling their early collaboration, the letter from M. Cosyns (J. 20) hoping to rejoin Blackett in Manchester after the Second World War and a letter from E.J. Williams, 1931 (J.108).
See also correspondence with Homi Bhabha, D.S. Kothari, A.W. Malivaganam in Section G, and letters of congratulation on the award of the Nobel Prize in Section A.