The ternary calculating machine of Thomas Fowler
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Thomas Fowler

Balanced ternary arithmetic

Fowler's binary and ternary tables

DeMorgan's description

The reconstruction

About the machine
Carry mechanism
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Fowler's ternary calculating machine - the multiplicand

The multiplicand consists of a series of sliding rods, one for each digit of the multiplicand. Each rod can be set by the user to one of three positions, representing the three possible values for each digit of a balanced ternary number.

For multiplication problems, the rods are not really an active part of the overall mechanism. They are more of a mnemonic device to guide the user through the rest of the calculation. When used for division, the quotient is read on these rods.


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