Jean-Charles de Borda
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Jean-Charles, chevalier de Borda was a French mathematician, physicist, and Navy officer. He invented the Borda count system for elections, which served as basis to other voting systems. He is also kn
Reflecting circle, on display at Toulon naval museum
Cover page of a 1791 copy of "Rapport sur le choix d'une unité de mesure" by Borda and the Marquis de Condorcet
Page one of a 1791 copy of "Rapport sur le choix d'une unité de mesure" by Borda and the Marquis de Condorcet
Pages 2–3
Gradian
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In trigonometry, the gradian – also known as the gon, grad, or grade – is a unit of measurement of an angle, defined as one-hundredth of the right angle; in other words, 100 gradians is equal to 90 de
Jean-Charles de Borda
…the metric system, after the French Revolution it was decided that the quarter circle should be divided into 100 angular units, currently known as the gradian, instead of 90 degrees, and the gradian into 100 centesimal minutes of arc (centigrades) instead of 60 arc-minutes. This required the calculation of…
Compass graded with 400 gon