Installation of the crane-bridge in Experimental Hall I1

Photographs taken at the beginning of September 1969 during the installation of the crane-bridge in Experimental Hall I1 of the Intersecting Storage Rings. This hall covered one of the two interaction regions (from the eight where beam collisions could take place in the ISR) where extensive provision in terms of space for the installation of experimental equipment was made from the start. The crane-bridge, manufactured by Ceretti- Tanfanl of Milan, was to be the longest in use at CERN with the exception of that in the West Experimental Hall (Hall E 1) described In CERN COURIER vol. 8, page 102. It was to be capable of operation at continuously variable speed using d.c. current motors powered by a Ward-Leonard supply. Its main characteristics was : total weight about 100 tons; maximum weight lifted : 40 tons; width : 47.6 m; maximum height of lift : 12.5 m; lifting speed : 6 m/min loaded; speed of bridge : up to 40 m/min.