Institution of Mechanical Engineers, Proceedings 1867 (Classic Reprint) - Hardcover

Excerpt from Institution of Mechanical Engineers, Proceedings 1867

In reference to the case mentioned in the paper of copper sheathing made in 1825 which had lost only per cent. Of its weight after eighteen years' wear, he was not able to understand how the loss of weight could have been so small during that length of time; because with the present metal sheath in g composed of copper and zinc it was found that if the metal was too poor, containing too small a percentage of copper, the ship's bottom fouled, from not oxidising sufficiently; and if the metal was too rich in copper, it oxidised too rapidly, and would thereby become speedily worn away. If therefore any sheathing had remained many years on a vessel, he thought it would either have fouled to a great extent, or have lost a great portion of its weight by oxidation.

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