Art
J-GLOBAL ID:201602013381580956   Reference number:58A0002075

Advances in Fog Signalling.

濃霧警報装置の進歩(蒸気や空気による警報器に代り多数の高声器によるものがdungenessのTrinity Houseに設置された伝達距離を高めるため390,510,630の3周波数を繰返す方式紹介)
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Volume:Issue:Page: 424-425  Publication year: 1958 
JST Material Number: B0089A  CODEN: BCELA  Document type: Article
Country of issue: United Kingdom (GBR) 
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