Or air conditioners that can pump heat from one place to another using only sound waves
Were the Vimanas, the ancient flying machines noted in prehistoric Indian texts, responsible for the ‘trumpets blaring in the sky’ described as warning harbingers in modern scripture?
“…a rotating helix as the shape of a sound-wave…”
The resonant tone from both tubes is nearly the same, despite almost 2:1 physical difference in lengths. The shorter tube is sealed at one end while the longer tube is open at both ends.
