Question

what are advantages and disadvantages of a sandglass??

Answer 1

The disadvantages of sand clock or hourglass are: The sand clock or hourglass had to be on flat surfaces every time so that it can work properly. It has a shortduration of a clock probably less than one hour. The main difficulty is one can't see the time from this gadget accurately.

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it's advantages ----
Sandclock is also known as sandglass,sand timer,sand watch,egg timer and hour glass. It measures the passage of a few minutes or an hour of time. Nowadays sandclocks are ornamental. They are also used in games.