Crossword Genius

Obsolete math aid (5,4)

Ross

I believe the answer is:

slide rule

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">obsolete math aid</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for slide rule that I've seen before include "Obsolete calculator" , "Old calculator" , "Old calculating device" , "Instrument for rapid calculations" , "old computer" .)

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