TITO GONNELLA’S PLANIMETER
TITO GONNELLA’S PLANIMETER

Author(s): Alessandra d’Amico Finardi
Subject(s): History
Published by: Scientia Socialis, UAB
Keywords: Area measuring tools; Planimeter; Tito Gonnella;
Summary/Abstract: The planimeters are area measuring tools. Now they are precision instruments used to trace around a closed loop of an object to find its area. The planimeters are used by engineers, surveyors, contractors, designers, and more. There are many kinds of planimeters, but principally roller and polar planimeters were introduced and used. The Swiss mathematician Jakob Amsler–Laffon (1823–1912) built the first modern planimeter in 1854, the concept having been pioneered by Johann Martin Hermann (1785?–1841) in 1814 and by Tito Gonnella (1794–1867) in 1824. In this paper I will present Gonnella’s planimeter and its peculiarities

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