sandglasses
- Scope note
- Timepieces that measure equal periods of time by the motion of sand or other freely flowing, fine-grained substances through a narrow aperture between two triangular or conical glass bulbs arranged mouth to mouth; probably introduced in the early 14th century and used then especially for timekeeping aboard ships.
- Date of creation: 29-Apr-2024
Accepted term: 29-Apr-2024