In the Harry Potter stories, an invisibility cloak can hide a person even while they walk, bend, or run. In the real world, ...

AS A jet fighter screams away from the deck of an aircraft-carrier a swirl of vapour trails from the steam-driven catapult that launched it into the air. Catapults are an ancient technology, developed ...

Materials react differently to electric and magnetic fields, and these reactions are known as electromagnetic responses. In ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Alfred Vail was a key partner to ...

Hearder's Magnetometer, an electro-magnet steel-yard and weight on wooden base used as an experimental electromagnetic lever apparatus. A 13 inch lever arm is pivoted at one end near an electromagnet.