Sand Glasses are works of craftsmanship in which two sheets of glass show an amount of sand in two colors, which is immersed in water. When the sand glass is turned, the sand, traditionally in black and a light color, moves down, creating new dunes and creating new drawings as the colors settle. It is a piece of craftsmanship found in Brazil, on t...
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http://en.wikipedia.org/wiki/Sand_Glass
Instrument for measuring time, consisting of two bulbous glass chambers connected by a narrow channel. The whole is often mounted within a wooden frame for stability. Upending the device allows a quantity of sand to trickle from one chamber to the other taking an exact period of time, usually one hour. Sand glasses, which preceded clocks and watche...
Found on
http://www.antique-marks.com/antique-terms-s.html
Instrument for measuring time, consisting of two bulbous glass chambers connected by a narrow channel. The whole is often mounted within a wooden frame for stability. Upending the device allows a quantity of sand to trickle from one chamber to the other taking an exact period of time, usually one hour. Sand glasses, which preceded clocks and watche …...
Found on
http://www.encyclo.co.uk/visitor-contributions.php
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