pantograph

Concise Oxford English Dictionary © 2008 Oxford University Press:
pantograph/ˈpantəɡrɑːf/

▶noun

• 1 an instrument for copying a plan or drawing on a different scale by a system of hinged and jointed rods.

• 2 a jointed framework conveying a current to an electric train or tram from overhead wires.

– derivatives
pantographic adjective.

– origin C18: from panto- + Gk -graphos ‘writing’.