A

David

Darling

pantograph

pantograph

A draftsman's pantograph, here being used to reproduce a map outline at 2½ times the size of the original.

A pantograph is an instrument for enlarging or reducing a geometric figure or motion. It consists of four hinged bars forming a parallelogram, one vertex being fixed. It is used in technical drawing and map-making. A spring-loaded pantograph linkage is used on electric locomotives to collect current from an overhead line.