게시물
In the 1920s, this aircraft listener operated an early acoustic detection system. The device used scoop-shaped reflectors to funnel engine noise through large listening tubes, allowing operators to pinpoint the direction of approaching planes long before radar was developed.
2mo
2 좋아요0 싫어요0 리포스트0 댓글
?
댓글
아직 댓글이 없습니다. 첫 댓글을 남겨보세요!