May/June 1997 Feature Articles: A Contribution to Ultrasonic Detection & Sizing of Linear Discontinuities in Welded Joints - by Petru Ciorau, Michael Scott, Dave Gibbons & Joe Bezubiak Everything You Wanted to Know About Multigas Detectors - by Martine Bissonnette Pipeline Integrity - by David K. Jolivette Metallurgy in Eastern Liguria in the Pre-Historic Age