Folder B.27.1: 'A short historical survey of the discovery and manipulation of the knowledge gained from soap-bubbles and their allied forms of plane-films and capillarity', 1929. An essay submitted for the Grenfell Essay Prize, Cambridge. 36 pp. manuscript. Folder B.27.2: 'Gyroscopes', 1930. An essay submitted for the Yeats Mathematics Prize, Trinity College, Cambridge. 88 pp. ms. and 3 pp. references. Folder B.27.3: Work on curve tracing, c.1929. Extensive notes,…