Crossword Genius

Calculating device (5,4)

Ross

I believe the answer is:

slide rule

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

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

I've seen this clue in The Mirror and The Telegraph.
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