What is "tracing cloth"

Tracing \Tra"cing\, n.

1. The act of one who traces; especially, the act of copying by marking on thin paper, or other transparent substance, the lines of a pattern placed beneath; also, the copy thus producted.

2. A regular path or track; a course.

   Tracing cloth, Tracing paper, specially prepared transparent cloth or paper, which enables a drawing or print to be clearly seen through it, and so allows the use of a pen or pencil to produce a facsimile by following the lines of the original placed beneath.