Note to Julius Caesar, 1.1.7, "thy rule"


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Julius Caesar,
Act 1, Scene 1, line 7
Shakespeare probably had in mind the type of folding ruler used in his time, which is still an emblem of the carpenter's trade, as can be seen in the logo of the United Brotherhood of Carpenters and Joiners of America.


folding carpenter's ruler
logo of the United Brotherhood of Carpenters and Joiners of America