Question

what is an electric pen?

Answer 1

Thomas Edison's electric pen was part of a complete outfit for duplicating handwritten documents and drawings. It was the first electric motor driven office appliance produced and sold in the United States. 

It came about as an offshoot of Edison's telegraphy research. In June 1875 Edison had the idea of using a perforated sheet of paper as a stencil for making multiple copies, and to develop the electric pen as a perforating device for common writing paper.

The hand held, wet cell battery operated pen was wired to an electric motor which drove a reciprocating needle which could make 50 punctures per second or 3,000 per minute. 

The user could place a stencil on firm blotting paper on a flat surface, then use the pen to write or draw naturally to form works and designs as a series of minute (tiny) perforations in the stencil.