Hourglass

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Referring to a cylindrical or elongated structure with a central constriction likened, sometimes in only a very general sense, to an hourglass
References in periodicals archive ?
Explain that a sand clock is often called an hourglass.
Among this eye-opening collection are surgical instruments, medical books, scales, sand clocks, astrolabes, Persian carpets, copies of the Quran, tombstones, musical instruments and a myriad of other things.
The collection in this section includes surgical instruments, scales, sand clocks, astrolabes and compasses to determine Ka'ba direction to help Muslims to pray.