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These experiments can be considered exploratory only.

However, they do demonstrate the presence of large normal pressures in the presence of flat shear fields which were forecast by the theory in the first part of the paper.

They also give information which will aid in the design of a more satisfactory instrument for the measurement of the normal pressures.

Such an instrument would be useful for the characterization of many commercial materials as well as theoretical studies.

The elasticity is a parameter of fluids which is not subject to simple measurement at present, and it is a parameter which is probably varying in an unknown manner with many commercial materials.

Such an instrument is expected to be especially useful if it could be used to measure the elasticity of heavy pastes such as printing inks, paints, adhesives, molten plastics, and bread dough, for the elasticity is related to those various properties termed `` length '', `` shortness '', `` spinnability '', etc., which are usually judged by subjective methods at present.