An instrument for copying maps on larger or smaller scale. Mostly are made of roads forming a parallelogram join on the four corners.

• A. Pantograph
• B. Stereoscope
• C. Planimeter
• D. Theodolite

Answer: (A)

Copying maps at different scales is done with a pantograph. Its mechanism is a set of bars arranged to form a parallelogram, with joints at the corners, so that when you trace over the map, the motion is transferred to a drawing at another scale. By adjusting the geometry of the linkage, you can enlarge or reduce the map while keeping its proportions and orientation. That parallelogram linkage is the key feature that makes a pantograph capable of accurate scale copying.

The other instruments have different purposes: a stereoscope provides a 3D effect from two images, a planimeter measures the area enclosed on a map, and a theodolite measures angles. None of them are designed to copy drawings at varying scales like a pantograph.