His forHourglass

An hourglass is a device that uses the passage of an amount of sand from the top to bottom half of the device to mark time. The amount of time an hourglass can mark depends on the size of the hourglass and the amount of sand in it. An hour would be the standard amount, but hourglasses can also be bought that are egg timers for cooking hard or soft boiled eggs, or shower timers when people want to save water.