From time to time, I indulge myself, by reading technical manuals from old, out of date operating systems or software packages. It gives me the perspective that, not much has changed, although a lot has changed. The telegraph marked the beginning of long distance electronic communication, the beginning of a story which brings us to today.
If you wish to peruse the complete American Military Telegraph Manual, it can be found at:
Weighing it at over 800 pages, and 59 chapters, it is comforting to see that technical manuals have slimmed down over the years.