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a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves
a machine that adds numbers
adding machine, totaliser, totalizer
a calculator that performs simple arithmetic functions
a calculator that keeps a record of the number of times something happens
hand calculator, pocket calculator
a calculator small enough to hold in the hand or carry in a pocket
Napier's bones, Napier's rods
a set of graduated rods formerly used to do multiplication and division by a method invented by John Napier
calculator consisting of a cord with attached cords; used by ancient Peruvians for calculating and keeping records
a machine that subtracts numbers
an electronic counter that counts the number of electric pulses