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Gear pantograph 1

Green and blue gears have same tooth number.

OCD: straight line

AC and BD are parallel.

Triangles OAC and OBD are similar.

OC/OD = OA/OB = AC/BD = k = constant

O: immobile

Figures traced by pen E and pen C are similar. Scale factor is k.

Adjust OA and AC to get various values of k.

Bar linkage in a conventional pantograph is replaced by gear drive. Instead of 3 gear drive a rack and two pinion drive can be used.

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