Technique for producing picture of topography of sea bottom and for identification of wrecks consists of fan-shaped-type Asdic beam which is fitted downwards by angle appropriate to depth of water; instead of being trainable, transducer is fixed so as to transmit only on ship's beam; comparison between "shadow" and " searchlight" Asdics is made and series of trials conducted in Oct 1963 reported.
Asdics for wreck location
Dock Harbour Authority
Dock and Harbour Authority ; 44 , n 517
1963
3 pages
Article (Journal)
English
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