Category:Acoustic mirrors

English: Acoustic mirrors are passive device used to focus and amplify sound waves. Built mostly between WW1 and 2

Subcategories

This category has only the following subcategory.

The following 5 files are in this category, out of 5 total.

Acoustic Mirror Kent... 56,768 bytes	Sound Mirror at Deng... 89,838 bytes	Sound Mirrors at Den... 106,123 bytes	WW1AcousticMirrorKil... 52,687 bytes
Whisper dishes New M... 750,549 bytes