The depth of water under a vessel can now ba ascertained by the hydrophone, which works on the reflection of fne sound of the ship's propeller from t’he ocean bed.
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https://paperspast.natlib.govt.nz/newspapers/DOM19210321.2.45.3
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Dominion, Volume 14, Issue 150, 21 March 1921, Page 4
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30Page 4 Advertisements Column 3 Dominion, Volume 14, Issue 150, 21 March 1921, Page 4
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