Sur@sur_27

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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

Follow

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