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The tracks of individual α - or β -particles, or of ionising rays of any kind, through a moist gas may be made visible by condensing water upon the ions set free, a suitable form of expansion apparatus being used for the purpose. In order that the clouds formed should give a true picture of the trails of ions left by the ionising particles, it is necessary that little or no stirring up of the gas should result from the expansion. It is desirable that no interval long enough to allow of appreciable diffusion of the ions should elapse between their liberation and the production of the super-saturation necessary for the condensation of water upon them; and that the cloud-chamber should be free from all ions other than those in the freshly formed trails.

On a method of making visible the paths of ionising particles through a gas