Trolley New (IMAGE) DOE/Argonne National Laboratory Caption Fully assembled trolley system with wheels for riding on rails and the new external barcode reader for an exact position measurement. The 50 cm long cylindrical shell encloses the 17 NMR probes and custom-built readout and control electronics. Credit (Image by Argonne National Laboratory.) 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.