They next hit on a contrivance which enabled them,by turning a handle,to make one of the stones revolve upon the other; and this process,a little improved,is still the common practice of the East.

• 随后发明了一种装置，转动一个手柄便可使一块石头在另一块上面旋转，这一方法略加改进以后，仍为东方常用的办法。