Page:The ABC of Relativity.djvu/4

 NOTE

This book first appeared in 1925. The basic principles of relativity have not changed since then, but its applications have been much extended, and some revision was necessary for the present edition. [sic] This was carried out, with my approval, by Mr. Felix Pirani, who has re-written Chapter 11, and altered a number of other passages to agree with present knowledge.

B.R.