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
The mathematician demonstrated how to use Napier's bones to perform rapid calculations.
数学家演示了如何使用纳皮尔算筹进行快速计算。
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。



























