desribe how to make a snadclock with help of objects found around you
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An hourglass (or sandglass, sand timer, sand clock or egg timer) 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 flow of a substance (historically sand) from the upper bulb to the lower one. Typically the upper and lower bulbs are symmetric so that the hourglass will measure the same duration regardless of orientation. The specific duration of time a given hourglass measures is determined by factors including the quantity and coarseness of the particulate matter, the bulb size, and the neck width.
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Preparation of SandClock
- Take a small funnel of 6-7 cm in diameter. fix a rubber tube (50 cm long) tightly on the stem of the funnel. stretch a rubber sheet (or a balloon) on the mouth of the funnel and fix it tightly with a rubber band. put the open end of the tube on one of your ear.
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