. Mining and Scientific Press . f proper precautions are nol taken in makinga measurement of the surface-tension of an emulsion ofa flotation-oil in water. The film method also measuresa changing tension, which, however, is never very farfrom the surface-tension at the point of equilibrium be-tween the oil on the surface and the oil in the body ofthe emulsion. A method to be of any value in constructing surface-rion concentration curves from which the amount ofoil adsorbed by a mineral is determined, must measurethe tension of a surface of definite known age and allmeasurements must he made mi
. Mining and Scientific Press . f proper precautions are nol taken in makinga measurement of the surface-tension of an emulsion ofa flotation-oil in water. The film method also measuresa changing tension, which, however, is never very farfrom the surface-tension at the point of equilibrium be-tween the oil on the surface and the oil in the body ofthe emulsion. A method to be of any value in constructing surface-rion concentration curves from which the amount ofoil adsorbed by a mineral is determined, must measurethe tension of a surface of definite known age and allmeasurements must he made mi surfaces of this same agoin that results may he compared, or it mustmeasure the tension of a surface at a point where equi-lihrium exists between the oil on the surface and the oilin the body of the emulsion. Different methods of measuring the surface-tension ofemulsions of oil and water give widely different concentration curves for a pine-oil inwater by three different methods, namely, my ~ilm method 40 Mg. Pine-oil/I00 CC. water Fig. l in equilibrium with the oil in the bulk of the emulsionFor example, if an emulsion, in a suitable dish, beskimmed with a strip of paraffine paper and its surfacetension be measured immediately by the film method, thesurface tension of the fleshly formed surface will be 8 c; v^\5ur face - fens/on
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