View Original: | Large Air Sound Detector Type 90.jpg (1197x766) | |||
Download: | Original | Medium | Small | Thumb |
Courtesy of: | commons.wikimedia.org | More Like This | ||
Keywords: Large Air Sound Detector Type 90.jpg en Pre-World War 2 photograph of Japanese Emperor Hirohito inspecting an array of acoustic aircraft locators Their precise location is unknown Prior to the development of radar in World War 2 military air defence forces used these devices to locate approaching enemy aircraft by listening for the sound of their engines before 1945 PD-Japan-oldphoto Sound locators |