The 'war tubas' we used to spot warplanes before radar (2018)

Re:The 'war tubas' we used to spot warplanes before radar (2... by peter_d_sherman on Thursday May 28, 2020 @05:12PM (#23342710)

These structures might very well have non-military (peaceful) applications for physics experiments involving sound...

Sort of like what observatories are to light... these structures might be to sound...

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