This category refers to passive acoustic detectors which were used as a military air defense technique between World War 1 and 2 to detect approaching enemy aircraft by listening for the sound of their engines. The development of radar in World War 2 rendered this technology obsolete.
This category has only the following subcategory.
- ► Acoustic mirrors (3 C, 11 F)
Media in category "Sound locators"
The following 25 files are in this category, out of 25 total.