Two types of tests were performed on the uniaxial compression of snow; experiments at constant strain rate and at constant load. The strain rate can be represented as the product of functions of density, stress, temperature, and time. For densities between γ≃0.3 g/cc and γ≃0.6 g/cc the strain rate is proportional to (γice−γ)/γ to the fourth power. The strain rate varies linearly with stress for low stresses (2<σ<100 g/cm2) but increases to an approximately cubic relationship at higher stresses (1<σ<5 kg/cm2). An activation energy of about 14 000 cal/mole can be derived from the temperature dependence. In the constant load tests the strain is proportional to the time to a power of about 0.8. The effect of snow type is small, being less than the relatively large experimental scatter encountered.

No abstract

SUMMARY. A series of deformation measurements have been selected for preliminary studies on the plasticity of Greenland glacier ice. The measurements to be reported on were obtained in the Red Rock and TUTO tunnels in north-west Greenland. Both tunnels were excavated during the summer of 1955 with some additional work done during the summer of 1956. Deformation measurements made up to the end of the 1956 summer season, therefore, are oflirnited reliability, but certain trends appearing in these data seem worth reporting. The topics discussed are (I) the shearing of an initially vertical peg system at Red Rock, (2) the deformation of core holes at TUTO, and (3)

SUMMARY. A series of deformation measurements have been selected for preliminary studies on the plasticity of Greenland glacier ice. The measurements to be reported on were obtained in the Red Rock and TUTO tunnels in north-west Greenland. Both tunnels were excavated during the summer of 1955 with some additional work done during the summer of 1956. Deformation measurements made up to the end of the 1956 summer season, therefore, are oflirnited reliability, but certain trends appearing in these data seem worth reporting. The topics discussed are (I) the shearing of an initially vertical peg system at Red Rock, (2) the deformation of core holes at TUTO, and (3)