hourglasses Animated Gifs
hourglasses Free PicturesThese mechanical devices are used since ancient times to measure a certain time, that was what it took to drop the sand from one compartment to another.
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It is not known exactly what was the origin of the first hourglass, but began to see some engravings and paintings of the XIV century. This time measuring instrument consists of two containers, usually glass, which are interconnected and filled with sand. You have to place the sandglass vertically, with a full side up, and thus the time it takes to get all the sand from inside is posted. When the upper cavity is empty, can turn the sand clock to start the measurement again.