Jolly fall absorber designed for glaciers

Inserting the rope into a Jolly fall absorber, which is designed for protection on a glacier during a simultaneous march. Stick the loop of the rope through one eye of the Jolly and clip the carabiner to the loop of rope and to the second eye of the Jolly. Then fasten the carabiner to your harness. (Video from e-book Mountaineering Methodology, www.mountaineeringmethodology.com)