In spite of its buoyancy cork will not risk to the surface from a depth of 200 feet below the ocean's surface, owing to the great pre..st#re of water. At any depth short of that it will gradually work its way back to the surface.
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Bibliographic details
Star (Christchurch), Volume XLIV, Issue 191, 13 August 1931, Page 1
Word Count
45Untitled Star (Christchurch), Volume XLIV, Issue 191, 13 August 1931, Page 1
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