Magnet Tool (IMAGE) American Institute of Physics Caption This is a rotating permanent magnet tool developed by Smid et al for viewing magnetotactic bacteria with a light microscope. A first gear (1) is mounted on a motor to drive a larger gear (2). The second gear rotates around a fixed axis on which a third gear (3) is mounted. A fourth gear (4) is designed to change the direction of rotation of the fifth gear (5), upon which the permanent magnet is attached. Credit Pieter Smid/Ludwig-Maximilians-Universität 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.