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单词 Lazy tongs
释义

Lazy tongs

英语百科

Pantograph

Drafting pantograph in use
Pantograph used for scaling a picture. The red shape is traced and enlarged.
Pantograph 3d rendering
Diagram illustrating the principles used by William Wallace's eidograph

A pantograph (Greek roots παντ- "all, every" and γραφ- "to write", from their original use for copying writing) is a mechanical linkage connected in a manner based on parallelograms so that the movement of one pen, in tracing an image, produces identical movements in a second pen. If a line drawing is traced by the first point, an identical, enlarged, or miniaturized copy will be drawn by a pen fixed to the other. Using the same principle, different kinds of pantographs are used for other forms of duplication in areas such as sculpture, minting, engraving and milling.

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