**IBM
SPEAKERS BUREAU SLIDE SHOW**

**Slide
11**

**Napier's
Rods**

Each rod bears a multiplication table for a particular digit.
Multiplication and division are handled by addition and
subtraction. The rods were crude, but they did work and
were used by several inventors in later machines. Napier,
who is remembered for inventing logarithms, also introduced
the use of the decimal point.

Until the mid-1950's, Blaise Pascal's calculator was thought
to be the first attempt to mechanize the process of digital
calculation.

<<
Previous | Index | Next
>>