Midnight oil

Definition and stakes

Portrait of Jack London Jack London,  Martin Eden (1909)

“ Likewise she watched his toils, and knew the measure of the midnight oil he burned. Work! She knew that he outdid her, though his work was of a different order. And she was surprised to behold that the less food he had, the harder he worked. On occasion, in a casual sort of way, when she thought hunger pinched hardest, she would send him in a loaf of new baking, awkwardly covering the act with banter to the effect that it was better than he could bake. ”
Source: Gutenberg

Boverton Redwood,  1911 Encyclopædia Britannica (1911)

“ Others are deprived of a part of their more volatile constituents by spontaneous evaporation, or by distillation, in vacuo or otherwise, at the lowest possible temperature. Such are known as “reduced oils”.
In most petroleum-producing countries, however, and particularly where the product is abundant, the crude oil is fractionally distilled, so as to separate it into petroleum spirit of various grades, burning oils, gas oils, lubricating oils, and (if the crude oil yields that product) paraffin.
”
Source: Wikisource

Matthew Luckiesh,  Artificial Light: Its Influence upon Civilization

“ Its fuel remains conveniently solid so that it is readily shipped and stored; there is nothing to spill or to break beyond easy repair; but when it is lighted the heat of its flame melts the solid fuel and thus it becomes an "oil-lamp." Animal and vegetable oils were mainly used until the middle of the nineteenth century, when petroleum was produced in sufficient quantities to introduce mineral oils. This marked the beginning of an era of developments in oil-lamps, but these were generally the natural offspring of early developments by Ami Argand. ”
Source: Gutenberg

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