Tracing Board

The chart or Tracing Board on which the emblems of a degree are depicted for the instruction of a candidate. Carpets were originally drawn on the floor with chalk or charcoal, and at the close of the Lodge obliterated by the use of a mop and pail. To avoid this trouble, they were subsequently painted on cloth, which was laid on the floor ; hence they were called carpets.
In MacKeys Encyclopedia.

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