Experimental data for cloud chamber studies of X rays and ß [beta] rays This is a small laboratory notebook recording the experimental data corresponding to the long series of cloud chamber studies of X-rays and ß-rays which culminated in the production of two long and important papers published in the Proceedings of the Royal Society in 1923. (Investigations on X-rays and ß-rays by the cloud method. Part I:X-rays. Proc Roy. Soc A, 104, 1 and Investigations on X-rays and ß-rays by the cloud method. Part I: ß-rays Proc. Roy. Soc. A, 104,192). 27 October 1921-31 July 1922