Solenoid (image) Harvard John A. Paulson School of Engineering and Applied Sciences Share Print E-Mail Caption A filament is clamped at the top end and prestretched by applying a downward axial load to the bottom end. After a critical amount of twist is inserted, the filament spontaneously buckles into a shape known as a solenoid. Credit Video courtesy of Nicholas Charles/Harvard SEAS Usage Restrictions with credit Share Print E-Mail 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.