Sur@sur_27

متابعة

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.

1920s acoustic aircraft detector

2mo

Sur@sur_27

متابعة

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.

1920s acoustic aircraft detector

2mo