by a body falling a prefixed distance in air or in a viscous material

Full Title

Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timers > by movement or acceleration due to gravity > by a body falling a prefixed distance in air or in a viscous material

Classification Context

Section:

PHYSICS

Class:

HOROLOGY

Subclass:

TIME-INTERVAL MEASURING