Explanatory notes
… minerals. These oils, which are more or less liquid or semi-solid, consist predominantly of non-aromatic hydrocarbons … (e.g., treatment with acids or alkalis, with selective solvents, with zinc chloride, with absorbent earths, etc., … composed of a lubricating oil with about 10 to 15 % of soaps of aluminium, calcium, lithium, etc. (3) Transformer …