ASTRID & HANS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Oscillating quartz crystal, photographed housed in its capsule packaging. Quartz crystals vibrate at a defined frequency when exposed to an applied alternating electric field. Such crystals are used as timers in quartz watches. The phenomenon of the interraction of electrical and mechanical variables in a medium is known as the piezoelectric effect. Conversely, the compression of a quartz crystal may generate an electrostatic voltage across the crystal. This principle has been applied in the ignition system for some cigarette lighters.
Model release not required. Property release not required.