Flag semaphore is the telegraphy system conveying information at a distance by means of visual signals with hand-held flags. Information is encoded by the position of the flags; it is read when the flag is in a fixed position. Semaphores were adopted and widely used in the 19th century.
| Author: Anon |
| Publisher: Naval & Military Press |
| Publication Date: Nov 09, 2018 |
| Number of Pages: 38 pages |
| Language: English |
| Binding: Paperback |
| ISBN-10: 1783314540 |
| ISBN-13: 9781783314546 |