Answer: sliderule

AnswerCrossword Clue
SLIDERULE

Tool once used with logs

SLIDERULE

Calculator predecessor

SLIDERULE

Pre-calculator calculator

SLIDERULE
Antiquated calculator
SLIDERULE
Low-tech calculator
SLIDERULECalculator's ancestor
SLIDERULEObsolete calculating tool
SLIDERULEObsolete math-class tool
SLIDERULECalculator ancestor
SLIDERULEInstrument with scales
SLIDERULEObsolete calculator
SLIDERULEMathematical shortcut device.
SLIDERULECalculator.
SLIDERULECalculating instrument.
SLIDERULEManual calculator.
SLIDERULEInvention of 1620
SLIDERULELogarithmic instrument
SLIDERULECriterion for Kelly
SLIDERULECalculating device
SLIDERULEObsolete math aid
SLIDERULEOld tool for working on logs
SLIDERULEOld math calculating tool
SLIDERULEPocket calculator predecessor