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.