Sand timer. This device is used to measure a set period of time by the flow of sand (blue) from one chamber to the other through a narrow gap.

px px dpi = cm x cm = MB
Details

Creative#:

TOP10190230

Source:

達志影像

Authorization Type:

RM

Release Information:

須由TPG 完整授權

Model Release:

N/A

Property Release:

N/A

Right to Privacy:

No

Same folder images:

Same folder images