The New Zealand Railways Magazine, Volume 5, Issue 9 (April 1, 1931)
[section]
The following is an elementary and non-technical explanation of surveying, surveying instruments, and the methods employed in their use, more especially in relation to Railway Engineering. It is not intended for the enlightenment of the technical staff, the writer's object being rather to give a simple review of this interesting subject for the benefit of the reader unacquainted with the subject.