Difference between revisions of "Rule of thumb"

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[[File:Judge Thumb.jpg|thumb|upright|1782 caricature of judge Francis Buller over a ''Rule of Thumb'' trial.]]
{{quote box|The blond man laughed. "Sir Miesko, you astound me with your valor in battle and your meekness in wedlock. You had best take the advice of the Holy Church and never strike your wife with a stick longer than the distance from your fingertip to your elbow, nor bigger around than your thumb. Then take my advice and never use anything less! And often, Sir Miesko, to ensure your bliss, marital and otherwise."<br />&nbsp;&nbsp;&nbsp;"Your advice is always welcome, my lord, though it may be that I will state certain facts at tonight's festival." He grinned.<br />&nbsp;&nbsp;&nbsp;"Hah! That ''my'' wife chooses to stay in Hungary and I support her there? Well met, Sir Miesko."|Leo Frankowski, ''[[The Cross Time Engineer]]'' (1986)}}
A '''rule of thumb''' is a is a principle with broad application that is not intended to be strictly accurate or reliable for every situation. It is an easily learned and easily applied procedure for approximately calculating or recalling some value, or for making some determination.