Sample Wired in Holder (IMAGE) American Institute of Physics Caption Researchers at Caltech devised a way to calculate the electrical properties of individual components of a composite material by testing the material's response in a range of magnetic fields. This image shows the material wired in a sample holder designed to measure its electrical properties. Credit Tristan Day/Caltech Usage Restrictions This image may be used only with appropriate caption and credit. 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.