Napier's bones
01
纳皮尔的骨头, 纳皮尔棒
a set of numbered rods used for multiplication and division, invented by John Napier in the 17th century
例子
She relied on Napier's bones to compute large multiplications without a calculator.
她依靠纳皮尔算筹在没有计算器的情况下计算大乘法。



























