The ease and speed of making accurate surface tension tests, the small quantity of liquid required, and elimination of mathematical calculations, makes the “Ring Method” the preferred means of measuring the surface tensions of liquids and pulps.

The 4 cm. platinum-iridium ring is hung in a stirrup at the end of a light steel balance arm which is clamped to the middle of a torsion wire. The degree of rotation on one end of the torsion wire, which causes the ring to break away from the surface of the liquid, is measured by an indicator on a circular graduated scale from which it is easily read.

Surface tension machines play an important part in the ore dressing laboratory by determining the degree of lowered or increased surface tension of a pulp resulting from the addition of reagents.

This unit is furnished complete with torsion wire, platinum-iridium ring, a metal carrying case, and a complete set of operating instructions.