I remember when i was little boy

Whatever, some of you may know, for very long time there was a tool, a physical tool to reproduce or resize an drawing. I don't remember the name and can't find it on google, so let me explain : On one end you hold a pencil, drawing the original, and on the other end there was another pencil which draw the resized pic. The pencils where connected through this undescriptible (but simple) mecanisme i can't tell in english, hey .. there was a fixed plot and the 2 pencils where waving around. It was like pliers. Hence i want to make that run in Qbasic.

L