Sébastien Truchet

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Sébastien Truchet
File:Sebastien truchet.jpg
Sébastien Truchet
Born 1657
Lyon, France
Died February 5, 1729
Nationality France
Fields Mathematician, hydraulics, graphics and typography
Institutions France under Louis XIV
Known for Proportion of typefaces, plane tiling, sundials, channels, weapons
Influenced Pierre Simon Fournier, François-Ambroise Didot, Giovanni Battista Bodoni

Father Sebastian Truchet (French: Père Sébastian Truchet, 1657 – February 5, 1729), born Jean Truchet, was an eclectic Dominican priest born in Lyon and lived in Louis XIV times. He is known for being active in areas such as mathematics, hydraulics, graphics, typography, and for many inventions.


Truchet was born in 1657.

In 1693, he was selected by Abbé Bignon to assist his commission investigating the feasibility of compiling a description of all France's artistic and industrial processes for the minister Colbert. For his assistance, he was named an honoraire of the French Royal Academy in 1699.[1]

Truchet died on February 5, 1729, with the Descriptions of the Arts and Trades still incomplete.


Alongside the royal typographer Jacques Jaugeon, Truchet studied the proportions of typefaces using the French line (​112 French inch), a measurement derived from silversmithing. The commission then invented the first typographic point, using minute fractions of the line to create a bitmap that could be used to mathematically describe and italicize metal type. Their system had unnecessarily great precision relative to the accuracy with which fonts could actually be cut. Further, it did not match the sizes of the fonts then in use. Fournier subsequently corrected these failings, using a larger point with greater compatibility with existing forms of type.[2]

File:Romain du Roi.jpg
The ⟨a⟩ and ⟨b⟩ of the Romain du Roi, showing the bitmap of Truchet points used in their construction.

The commission also designed the Romain du Roi ("King's Roman"), which influenced Philippe Grandjean and through him the popular Times New Roman fonts. Other typographic innovations in the work of the commission involved the use of both bitmap and vector representations of letter shapes, tabulations of font metrics, and oblique font faces.[2]

In 1699, at the second public meeting of the French Academy, Truchet spoke on the motion of falling bodies,[3] and nearly 20 years later he was one of several scientists to confirm Newton's model of the separation of white light into colors.[4]

As a hydraulics expert, he designed most of the French canals.[citation needed]

Inspired by decorations he had seen on the canals, Truchet studied decorative patterns on ceramic tiles.[2] One particular pattern that he studied involved square tiles split by a diagonal line into two triangles, decorated in contrasting colors. By placing these tiles in different orientations with respect to each other, as part of a square tiling, Truchet observed that many different patterns could be formed. This model of pattern formation was later taken up by Fournier, and is now known to mathematicians and designers as Truchet tiling.[5]

He is also known for his expertise as a watchmaker,[6] and for his inventions concerning sundials, weapons and tools for transplanting large trees within the Versailles gardens.[citation needed]

See also


  1. Sturdy, David J. (1995), Science and Social Status: The Members of the Académie des Sciences, 1666–1750, Woodbridge: St Edmundsbury Press for the Boydell Press, p. 301, ISBN 0-85115-395-X<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>.
  2. 2.0 2.1 2.2 André, Jacques; Girou, Denis (1999). "Father Truchet, the typographic point, the Romain du roi, and tilings" (PDF). TUGboat. 20 (1): 8–14.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. Sturdy, David J. (1995). Science and Social Status: The Members of the Académie Des Sciences 1666–1750. Boydell Press. p. 294. ISBN 9780851153957.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. Rowlinson, J. S. (2002). Cohesion: A Scientific History of Intermolecular Forces. Cambridge University Press. p. 26. ISBN 9780521810081.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  5. Smith, Cyril Stanley (1987). "The tiling patterns of Sebastian Truchet and the topology of structural hierarchy". Leonardo. 20 (4): 373–385. doi:10.2307/1578535.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles> With a translation of Truchet's text by Pauline Boucher.
  6. Ilin, M. (1932). What time is it? The story of clocks. George Routledge & Sons. p. 83.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>. Translated by Béatrice Kincead.

External links