Instrument for Conical Anamorphosis
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Inventor
Jacob Leupold (1674-1727)
Historic Period
1713
Description
Rare instrument for drawing conical anamorphoses starting from a given drawing. The instrument is composed of two rods of different length – the shorter one with a metal indicator and the longer one with a pen point – connected by a string to two pulleys of different diameter. The assembly is mounted on a support with a metal tip to be stuck into the centre of the given drawing. Geometrically speaking, this metal tip acts as centre of projection, while the given drawing is contained within a circle corresponding to the base of the conical mirror in which the anamorphic image must be viewed. Due to the different diameters of the pulleys, the further the indicator moves away from the centre of projection, the more the pen point advances at ever greater increments. To reproduce the drawing, the instrument completes one full rotation around the centre of projection. The resulting drawing is a deformed copy of the original, a conical anamorphosis whose otherwise jumbled image assumes its proper form only when observed reflected in a conical mirror positioned in place of the given drawing.
Bibliographical Resources
Leupold, Jacob. Anamorfosi mechanica nova, oder Beschreibung dreyer neuen Maschinen, Leipzig, 1713.
Author of the entry: Filippo Camerota
