More than one of our readers suggested we highlight this beautifully-shot process documentary about the laborious and precise manufacturing of piezoelectric quartz crystals in the early 1940s.

Natural quartz crystals usually have a long body with a ... These wafers then go through repeated lapping, slicing, and testing operations to tune their piezoelectric properties before ending ...

Quartz is a naturally occurring ... for batteries or external power sources. Piezoelectric crystals are the core components of ultrasonic transducers, which generate and detect high-frequency sound ...