is all that is left of one of the sandglasses found on the Mary Rose.
As you can see, there is no glass left, only the wooden frame that
This is a reconstruction of a sandglass. There were probably
at least two different types on board the Mary Rose.
The first would be a thirty second glass, this was used for timing
the speed of the ship using the log reel.
The second would be a half hour glass, used for measuring the length
of the watch.