Instrument for Copying Drawings

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Has no specific name.


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Historic Period

XVI century


Description

Illustrated in a manuscript by Giacomo Contarini, the instrument is composed of a goniometer with a graduated ruler pivoting at its centre. The goniometric circle had four points used to fix it to the drawing board. The ruler had symmetrical graduation, so that each point measured on the drawing placed beside the goniometer could be transcribed onto the blank sheet of paper placed on the opposite side. To enlarge or reduce a drawing, it was sufficient to multiply or reduce the measurements.


Bibliographical Resources

Contarini, Giacomo. Figure d’istromenti matematici e loro uso , ca. 1590. Oxford, Bodleian Library, Ms. Canon. Ital., 145, c. 40.



Images


Author of the entry: Filippo Camerota

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