题目选项分析

By devising an instrument made from a rod, wire, and lead balls, and employing uncommonly precise measurements, Henry Cavendish was able in 1797–1798 to arrive at an astonishingly accurate figure for the weight of the earth.

Having devised an instrument from a rod, wire, and lead balls, and employment of uncommonly precise measurements, Henry Cavendish in 1797–1798 was able to arrive at an astonishingly accurate figure for the weight of the earth.