1840: Histoire de l'invention de l'imprimerie par les monuments.

1840: Histoire de l'invention de l'imprimerie par les monuments. Album Typographique exécuté à l'occasion du Jubilé Européen de l'Invention de l'Imprimerie. Paris, De l'Imprimerie rue de Verneuil, n°4, 1840.
Walter Wilkes (1990) describes Duverger's illustration and states that the first moulds did not have an 'overhang' between the mouthpiece/jet and the carriage. The jet had to be sown off to make characters the same height. This could never be done with great accuracy and Duverger claims that the results can be seen in Gutenberg's Donate. In the improved version, this 'overhang' was added to create the 'feet' of characters.