Bronzed 30 Min Hourglass with StandCollectable because of their combined historical and practical value. Ships hourglasses were calibrated to the half hours of the ships watch. To appreciate the important symbolism of the hourglass, Renaissance artists painted still lifes which were also called Vanitas, filled with symbolism and morals. They very often depict hourglasses. Dimensions: 7. 3 x 5. 1 x 10 in (18. 5 x 13 x 25. 4 cm)