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