Heliograph
The best part in that article is:
By the time the mirror instruments were retired in 1941, they were seldom used for signalling. Still, the army hated to see them go as "They made damn fine shaving mirrors."
By the time the mirror instruments were retired in 1941, they were seldom used for signalling. Still, the army hated to see them go as "They made damn fine shaving mirrors."
Users browsing this forum: No registered users and 3 guests