Letter from [Alan Archibald Campbell] Swinton, to Sir William [Henry] Bragg, F. R. S. Aware that Bragg is due to give a series of three lectures at the Royal Institution on the early history of X-Rays and under those circumstances hopes to send him some copies of his papers on the subject, which are among the two earliest published in this country. Discusses his papers in depth and lists the apparatus described. 24 December 1928