 Customized and further improved versions of Abakanowicz's design were manufactured until well after 1900, with these later modifications being made by Abakanowicz in collaboration M. D. Napoli, the "principal inspector of the railroad Chemin de Fer de l’Est and head of its testing laboratory".The input to the integraph is a tracing point that is the guiding point that traces the differential curve.The output is defined by the path a disk that rolls along the paper without slipping.