crude oil refined according to the above method Illuminating oil 65 per cent; naphtha 15 per cent: tar and coke 12 per cent; gases loss evaporation 8 per cent. From this it appears that about twenty per cent of the material is either lost or converted into sub stances of little value to the refiner. the difficulties above described. One ot these stills, scientific american, 1865-08-19
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