The War tubas of Japan
Before the advent of Radar, these acoustic listening devices from the 1930's were used to listen for incoming planes.
For scale see the anti aircraft guns in the background.
From http://www.futilitycloset.c... and http://cominganarchy.com/20... and http://en.wikipedia.org/wik...
By netchicken:
posted on 28-2-2008 For scale see the anti aircraft guns in the background.
From http://www.futilitycloset.c... and http://cominganarchy.com/20... and http://en.wikipedia.org/wik...
