And so they proceeded to invent the verge-and-foliot escapement, using a fallingweight as with its Greek antecedents.
于是他们利用希腊早就使用的重锤着手发明了立轴横杆式擒纵机构。
2
The feature common to all of them is that, like the hand forging hammer, they utilize the energy of a fallingweight to develop the pressure needed for shaping the metal.
就其一般特性而言，都象手工锻锤一样，它们均利用落重能量来产生金属成型所需的压力。
3
Since the tamping foot remains on the ground during the compacting process, there is no risk of flying debris and no danger from a fallingweight as with conventional dynamic compaction.