Assertion: hourglass | /r/HasProperty | device
Facets:
value: for the measurement of time
type: PURPOSE
Source sentences:
text: An hourglass (or sandglass, sand timer, sand clock or egg timer) is a device used to measure the passage of time.
text: An hourglass is a device for the measurement of time, closely connected to the 'sands of time' image.
text: An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the intervals of time.