Abstract
Two small ice spheres are suspended by thin cotton filaments. The top of one filament is displaced horizontally by a screw motion. The movable ice sphere is brought in contact with the stationary sphere, and then the screw is turned back. The normal cohesion is measured by the inclination of the filament when the spheres are separated. Sometimes the ice spheres showed a rotation before separation. The rotation took place more frequently in the range of temperatures near the freezing point, but it was observed once at −7.0°C., the lowest temperature when distilled water was used. When ice spheres made of 0.1% solution of NaCl were used, this rotation was very likely to occur and was observed quite often at −14°C. Successive rotations were sometimes observed in this case. These phenomena are explained by considering a model of the point of contact, which is composed of a solid ice bond and the surface films of a liquid-like nature. The relation between the strength of the ice bond and the area of contact is calculated by using Hertz's equation.
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