The Supreme Hour-Glass

The largest and most accurate hour-glass in the world has been erected in front of the natural history museum in Mainz. It is made of Duran borosilicate glass and features a computer-controlled timing device.

Author
W Lorke
Origin
Unknown
Journal Title
Schott Information 1987 2 20-21
Sector
Special Glass
Class
S 85

Request article (free for British Glass members)

The Supreme Hour-Glass
Schott Information 1987 2 20-21
S 85
Are you a member?
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
9 + 8 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.