Any device in science is a window on to nature, and each new window contributes to the breadth of our view.

Those placed in the position which I now occupy, commonly feel concern about their worthiness to receive the great honour which has been done them.

How much more must this be so in my own case for I am conscious not only of the great names and achievements of those who have preceded me, but also of the living presence of many of my masters and teachers.

The particular features of the photographic method of detecting atomic particles enabled us to establish the existence of transient forms of matter which had escaped recognition by other methods.