What are the disadvantages of sand clock or hourglass

Sand clocks are sometimes called hourglasses. Not all sand clocks measure hours. Some are made to measure as short as 3 minutes.It works on the principle that gravity causes the grains of sand to flow through a small neck in the glass container.
The disadvantage is that they had to be on flat surfaces to work properly. With regard to work, this hourglass is a short duration clock. It is very rare that such a model works for more than 1 hour. And also it is not possible to determine time accurately with this.

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