A more thorough explanation:

Definition: Antigraph (an-ti-graf) is an old-fashioned term that refers to a copy or counterpart of an instrument.

Example: In the past, when people needed to make copies of important documents, they would use an antigraph. This was a device that could create a duplicate of the original document, often by using a special ink or paper.

Explanation: The example illustrates how an antigraph was used to create a copy of an important document. This was especially useful before the invention of modern copying machines, which can create multiple copies quickly and easily. An antigraph was a way to make sure that important information was preserved and could be shared with others.