First published in 1942, as the second edition of a 1941 original, this book was intended to supply a course of mathematical instruction for the Air Training Corps Cadets during the Second World War. The text provides a cursory review of mathematical basics, then goes on to demonstrate the practical applications of those basics to 'the many and varied problems and interests of the Services'. This book will be of value to anyone with an interest in the history of education in the military during the Second World War.