Alat ini digunakan sekitar Perang Dunia Pertama oleh pihak British, bertujuan untuk mendengar bunyi kehadiran kapal terbang musuh tatkala ketika itu, radar masih belum dicipta.
A few years ago we posted about these beautiful parabolic structures made of concrete, as a way to magnify sound in the days of World War I. The British used them to listen for incoming enemy fighters in an era that antedated radar.
http://www.core77.com/
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