Old tool for working on logs (9 letters) — Crossword Helper

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The Clue

Old tool for working on logs (9 letter answer)

The Answer

SLIDERULE

Tags

1620 aid calculating criterion device instrument invention kelly log logarithmic math obsolete old sliderule tool working

Notes

The answer SLIDERULE is rarely seen, appearing only about once every 2100 puzzles.

Related Clues

Calculating device
Criterion for Kelly
Invention of 1620
Logarithmic instrument
Obsolete math aid
Old math calculating tool