Subject-based Correspondence Files organised by Alan Archibald Campbell Swinton Incoming and outgoing correspondence files arranged by subject, forming a chronological string of communication on specific topics with various correspondents, also containing Swinton's own notes. Subjects include 'Science and Psychical Research'; 'Telepathy Broadcast Texts'; 'Water Divining'; 'Society of Radiographers'; 'Institution of Electrical Engineers'; 'Post Office Broadcasting Board'; the publication of Swinton's book; and on television. 1924-1930