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Meaning “…an easily learned and easily applied procedure for approximately calculating or recalling some value, or for making some determination.â€
“The exact origin of the phrase is uncertain.The earliest known citation comes from J. Durham’s Heaven upon Earth, 1685, ii. 217: “Many profest Christians are like to foolish builders, who build by guess, and by rule of thumb.â€
Sir William Hope wrote in his The Compleat Fencing Master, 1692: â€What he doth, he doth by rule of Thumb, and not by Art.“ James Kelly's The Complete Collection of Scottish Proverbs, 1721, pg 257, includes: “No Rule so good as Rule of Thumb, if it hit.â€
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