21. The ship returned to London on 21 April 1822 with a cargo of 346 tons of sperm oil . 22. He returned in 1794 with 15 tuns of sperm oil , seven tuns of whale oil, and 7000 seal skins. 23. Rivera introduced into America the manufacture of sperm oil , which became one of the leading industries and made Newport rich. 24. The " Pequod " gams next with the " Bachelor ", a Nantucket ship heading home full of sperm oil . 25. She returned to Britain on 19 September 1831 with 1100 barrels of sperm oil , and possibly other cargo as well. 26. Spermaceti wax is extracted from sperm oil by crystallisation at, when treated by pressure and a chemical solution of caustic alkali. 27. Historically, the liquid from this organ was used to produce sperm oil , providing the economic basis for the sperm whaling industry. 28. A coat of sperm oil provided a temporary protection for the metal components in firearms, because it did not dry out or gum up. 29. In August " Britannia " was reported off the coast of California with 30 tons of sperm oil and 150 tons of elephant seal oil. 30. She was at Timor in January 1829 with 100 barrels, and at the Bay of Islands on 5 September with 220 tuns of sperm oil .
