Doomsday Defense Library Navigation & Signals
Military manual · 1910
Visual Signaling (Signal Corps Manual No. 6)
Historical text. Written in 1910. Military codes and procedures have changed since; International Morse code is the standard today.
Before radio was everywhere, armies talked across valleys with flags, mirrors and lamps. This War Department manual covers wigwag flags, the heliograph (a sun-mirror telegraph that can reach dozens of miles in clear weather), signal lanterns, semaphore, and the procedures for sending and receiving.
When the grid and the networks are down, line-of-sight signaling still works. See our signaling notes.
- Author
- U.S. Army Signal Corps
- Published
- 1910, Government Printing Office
- Topics
- Signaling for Rescue, Radio & Communications
- Rights
- Public domain: a work of the U.S. federal government.
- Transcription
- Project Gutenberg eBook #43515