Sperm oil

Definition and stakes

Various,  Popular Science Monthly (1914)

“ The curves for whale oil and sperm oil differ in certain important points. Except on the "tails" of the curves the imports of the more valuable sperm oil are far in defect of those for whale oil. Probably in consequence of the greater demand the source was earlier exhausted. The mode of the sperm-oil curve lies, in consequence, nearer the inception of the industry, and the curve is therefore far more skew. It is interesting to note that in more recent years, the imports of sperm oil have been maintained at a relatively higher point than has that of whale oil. ”
Source: Wikisource

Richard Lydekker,  1911 Encyclopædia Britannica (1911)

“ During the first half of the last century the colony of New South Wales was busily engaged in this trade, and in 1835 exported 2989 tons of sperm-oil.
Since the year 1882, when no less than 203 head were taken by the Peterhead whaler “Eclipse,” the Norwegians have carried on a fishery for the bottle-nosed whale (Hyperoodon rostratus) , a species which although greatly inferior in point of size, yields an oil closely akin to sperm-oil, but possessed of even greater lubricating power. An average male bottle-nose will yield about 22 cwts. of oil containing 5% of pure spermaceti.
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Source: Wikisource

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