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.
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.