Here's something interesting, Jackie, on water glass:

From Webster's Revised Unabridged Dictionary (1913) :

Water glass \Water glass\
1. A clepsydra.

2. An instrument consisting of an open box or tube with a
glass bottom, used for examining objects in the water, as
upon the sea bottom in shallow places.

3. A water gauge for a steam boiler.




http://freedictionary.org/cgi-bin/Dictionary
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