Le Grand Disque Chiffré. Nouvelle Méthode. Pour apprendre aux enfants les quatre premières règles de l'arithmétique.
Late 19th century educational tool for teaching children the four basic rules of arithmetic, devised by Father Charier, former student of the École Supérieure et Industrielle de la ville de Metz, formed as two octagonal stiff cardboard disks joined at the center, the top disk divided into four sections, one..... More