How to draw bigger and smaller with a pantograph

I found this old pantograph and thought I'd show it as no one really uses them these days as we just dial up a 25% increase on a photocopier or photoshop and

How Does a Pantograph Work?, blog@CACM

Pantograph for drawing circles

Lab 1 - Scale: Larger or Smaller - Play

Lab 1 - Scale: Larger or Smaller - Engage

Computerized Quilting Pattern Ocean Waves Large Edge-to-Edge 2

How to use a pantograph

Pantograph - Wikiwand

Lab 2 - Design Challenge! - Play

Our favorite pantograph patterns - APQS

The Golden Rules for Artists

302 Short Demo On How I Enlarge Artwork For Layout

How to make a pantograph (enlarge an image)

How to decide how to size a pantograph - Ma Tante Quilting