French Helmet Test (IMAGE) Duke University Caption A French helmet from World War I sits beneath a shock tube to test how well it protects the dummy underneath from a shock wave. The ridge down the center of the helmet was designed for deflecting shrapnel, but may well have also helped deflect the shock wave, allowing the helmet to outperform even modern combat helmets. Credit Joost Op 't Eynde, Duke University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.