Divine office glass
From Object Wiki
| Divine office glass | |
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| Manufacturer | (unknown) |
| Production years | (unknown) |
| Production location | (unknown) |
Divine office glass in double brass case. Running time 9 ΒΌ minutes.
[edit] How it works
The timekeeping depends on the regular flow of sand through a small orifice. The time taken for one bulb of the sand glass to empty is a definite interval, at the end of which the glass can be turned over and the process repeated. Sand glasses are useful for measuring long periods of time, but prove inadequate for short time intervals.
[edit] Memories
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Do you remember stories about sand glasses? Add your memories. |
[edit] In the Science Museum's Records
Inv. No: 1953-301