pantograph

[pan-tuh-graf, -grahf]
noun
1.
Also, pantagraph. an instrument for the mechanical copying of plans, diagrams, etc., on any desired scale.
2.
Electricity. a device usually consisting of two parallel, hinged, double-diamond frames, for transferring current from an overhead wire to a vehicle, as a trolley car or electric locomotive.

Origin:
1715–25; panto- + -graph

pantographer [pan-tog-ruh-fer] , noun
pantographic [pan-tuh-graf-ik] , pantographical, adjective
pantographically, adverb
pantography, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
pantograph (ˈpæntəˌɡrɑːf)
 
n
1.  an instrument consisting of pivoted levers for copying drawings, maps, etc, to any desired scale
2.  a sliding type of current collector, esp a diamond-shaped frame mounted on a train roof in contact with an overhead wire
3.  a device consisting of a parallelogram of jointed rods used to suspend a studio lamp so that its height can be adjusted
 
pantographer
 
n
 
pantographic
 
adj
 
panto'graphically
 
adv
 
pan'tography
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

pantograph

instrument for duplicating a motion or copying a geometric shape to a reduced or enlarged scale. It consists of an assemblage of rigid bars adjustably joined by pin joints; as the point of one bar is moved over the outline to be duplicated, the motion is translated to a point on another bar, which makes the desired copy according to the predetermined scale. In the the links 2, 3, 4, and 5 are connected by pin joints at O, A, B, and C. Joint O is fixed to a support, while joints A, B, and C are free to move. Link 5 is a solid bar continuing on to Q. Point P is the guided point and is usually fixed on link 4. As P is guided on a specific path, such as the square in the , point Q will follow a similar path on an enlarged scale. Conversely, if point Q is guided, point P will follow a similar path on a reduced scale

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
He used a homemade version of a pantograph, with which he produced exact
  full-size details of these monuments.
The punches were cu by a pantograph which traced the drawing of the letter and
  reduced it o a size that would fit the punch head.
They also tested the pantograph, the device that carries electric current from
  the overhead lines to the train.
Include such workers as etcher-circuit processors, pantograph engravers, and
  silk screen etchers.
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