Underwater protection of new tonnage. John S. Craig & Co. Ltd. have for several years carried out an intensive research programme in order to formulate a satisfactory painting and protective system for the underwater bodies of new ship constructions. Tests resulted in the Clan Sutherland, built by Greenock Dockyard Co. Ltd. for the owners, Messrs. Cayzer, Irvine & Co. Ltd., being coated with the system which had been evolved, consisting of a chemical treatment by Foscote R.S. followed by two coats of Impervo metal primer.
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