text: The Chinese inventor Zhang Heng ( 78 â `` 139 ) was the first in history to apply motive power in rotating the astronomical instrument of an armillary sphere , by use of a water wheel .
simplified: The inventor Zhang Heng ( 78 â `` 139 ) was the first in history to apply motive power in rotating the astronomical instrument of an armillary sphere , by use of a waterwheel .