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

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