Pantograph (drawing)
See also: Pantograph (homonymy)
A pantograph is a instrument of Dessin, made of articulated stems which makes it possible to make enlargings or reductions by using the properties of the Homothétie to preserve the proportions between the original drawing and the copy.
The first pantograph was built in 1630 by Christoph Scheiner, a German Astronome , which used the instrument to recreate Diagramme S. a first arm is fixed compared to the support, the central arm is prolonged by a small pointer, and the last is provided with a pencil. By moving the pointer on the diagram, a copy of the diagram is carried out by the pencil on another sheet of paper. The dimension of the produced image can be changed by modifying the dimension of the parallelogram.
An engraving of the pantograph appears in the Encyclopedia of Diderot and Alembert, with half of the 18th century.
A more complex version, derived from the pantograph and named Eidographe, was developed by William Wallace in 1831.
Today, one finds pantographs modern in stores of toys.
See too
Related articles
- Eidographe
External bonds
- pantographs: simulation and mathematics.
Simple: Pantograph
| Random links: | National institute of horticulture | Rich Internet Application | Soundtrack To Your Escape | James Abercrombie | Russell Brown | Aéroport_international_de_Dayton |