Ring-shear devices

 

Ring-shear device configured for experiments at controlled shear rates

Specimen chamber of the ring-shear device

New ring-shear device for the study of glacier sliding over either a hard or soft bed. The chamber that contains the ice is within the green tub, which holds the temperature-control fluid that circulates around the ice and bed. The upper platen that rotates and thereby drags the ice over the bed is visible just above the green tub. One of the two gear assemblies (blue) is at head level. Electrical cables are for thermistors and other sensors, video cameras, and motors.