Sir William Lawrence Bragg: letters and notes regarding a book on crystals (1929, 1 folder, c. 23 items) Notes headed 'X ray Optics (crystal physics)', handwritten and typed. Notes beginning '(1) Temperature factors', handwritten. Letter from Miss W.E. Deighton, sending copies of letters between Mr Astbury and Sir William Henry Bragg, about 'the book', Feb. 1929. Correspondence between William Henry Bragg and W.L. Bragg, Jan. - Feb. 1929, about a proposed book on crystals, including a contents list and notes on who should write what. There is one letter from J.D. Bernal, 28 Jan. 1929, and a memorandum of 'Subjects for discussion at crystal structure conference'. Drafts of papers by various authors (1 folder, 4 items) F.A. Lindemann, 1915: typescript beginning '1. The various electron theories of conduction, etc.', with a handwritten note at the top: 'F.A. Lindemann. Remarks in the Discussion on Thermionic Emission, at the meeting of the B.A. 11.IX.1915' (7 pages). O.W. Richardson, undated: typescript with the title-page 'The emission of electrons from Tungsten at high temperatures: an experimental proof that the electric current in metal is carried by electrons. By O.W. Richardson', undated, with 'Palmer Physical Laboratory, Princeton, N.J.' at the end (9 pages). A.H. Compton, 1920: typescript with the title-page 'Preliminary draft, The Scattering and absorption of high frequency radiation. Arthur H. Compton, March 30, 1920', with handwritten annotations (41 pages). H.A. Wilson, undated, handwritten paper, 'On the electrical conductivity of salt vapours. By Harold A. Wilson', undated (26 pages, plus 5 pages of diagrams and graphs).