This page gives an overview of all articles in the 1911 Brittanica which are alphabetized under Cas to Cat.
Calcium monosulphide, CaS, a white amorphous powder, sparingly soluble in water, is formed by heating the sulphate with charcoal, or by heating lime in a current of sulphuretted hydrogen.
The disulphide, CaS2, and pentasulphide, CaS 5, are formed when milk of lime is boiled with flowers of sulphur.
Beside this their chief and easy work of oxidizing carbon, silicon and phosphorus, the conversion processes have the harder task of removing sulphur, chiefly by converting it into calcium sulphide, CaS, or manganous sulphide, MnS, which rise to the top of the molten metal and there enter the overlying slag, from which the sulphur may escape by oxidizing to the gaseous compound, sulphurous acid, S02.
On the contrary, Louvois flatly refused Saint-Mars's request in 1672 to be allowed to do so, and was exceedingly chary of allowing it in 1675 (only "en cas de necessite," and "vous pouvez donner le dit prisonnier a M.
Duprez (" Sur un cas particulier de l'equilibre des liquides," Nouveaux del' Acad.
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