九〇式大空中聴音機きゅうまるしきだいくうちゅうちょうおんき

noun

Japanese war tuba; pre-radar acoustic locator

Historical term for a large acoustic detection device used by the Imperial Japanese Army before radar. Often referred to in English as 'Japanese war tuba' due to its horn-like appearance.

• 九きゅう〇式大空中聴音機は、敵てっ機きのエンジン音おとを捉とらえるために使つかわれた。

  The Type 90 large airborne acoustic locator was used to capture the engine sounds of enemy aircraft.

• 戦せん前ぜんの日本にほんでは、九きゅう〇式大空中聴音機のような聴ちょう音おん機きが防ぼう空くうに用もちいられた。

  In prewar Japan, acoustic locators like the Type 90 large airborne acoustic locator were used for air defense.