Clavius, Christopher (1604) Geometria Practica (in Latin) Rome, (Italy): Aloisii Zannetti. Book 1, chapter 2, pp. 15–19. See especially the illustration on p. 16. From p. 15: "Constructio quadrantis, in quo minuta quoque, ac secunda deprehendantur, etiam si gradus in ea secti non-sint. Et quo pacto eadem minuta & sec. obtineri possint in quadrante in 90 gradus distributo. Ac denique qua ratione ex data recta in paucissimas partes aequales divisa abscindi possint partes millesimae, etc." (The construction of a quadrant in which any minute and second [of arc] are observed, even if they are not divided into those graduations. And where fixed, the same minute and second may be able to be obtained on a quadrant [that has been] divided into 90 degrees And furthermore by the same reasoning, from a given straight [line], they may be able to be divided into the smallest, equally divided parts (thousandths, etc.).)
de la Lande (1764). Astronomie (in French). Vol. 2. Paris, France: Desaint & Saillant. p. 859. From p. 859: "La division qui est aujourd'hui la plus employée est appellée dans plusieurs Auteurs division de Nonnius, quoique Nonnius n'en soit pas l'Auteur; mais il en avoit imaginé une autre qui eut beaucoup de célébrité, & qui pouvoit conduire à celle que nous avons aujourd'hui. Le véritable Auteur de la nôtre fut Pierre Vernier qui la publia dans un petit Ouvrage imprimé à Bruxelles en 1631." (The scale which is most used today is called by many authors "Nonnius' scale", although Nonnius is not the inventor of it; but he had imagined another one which was very well known and which could have led to what we have today. The true inventor of our [scale] was Pierre Vernier who published it in a small work in Brussels in 1631.)
