Usage examples "calculator":
But-" Possibly she thinks she is sincere," reasoned my head with my heart; " even the sincerest women, brought up as was she, always have the calculator
underneath; they deny it, they don't know it often, but there it is; with them, calculation is as involuntary and automatic as their pulse." - "The Deluge",
David Graham Phillips.
The radar gave him the distance from the surface of the asteroid, and he measured the diameter and punched it through the calculator.
The King of Prussia seems to be a cool calculator,
prepared to profit by the general distress. - "The Diplomatic Correspondence of the American Revolution, Vol. IX",