Question

what is Sandydial clock

Answer 1

sandydial clock is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated trickle of material (historically sand) from the upper bulb to the lower one. Factors affecting the time interval measured include sand quantity, sand coarseness, bulb size, and neck width. sandydial clock may be reused indefinitely by inverting the bulbs once the upper bulb is empty.