Wooden box containing Amsler's integraph, for calculating the area and first two moments, with one counterweight, three tracer arms, and a guide rail 53" long in its own box Wooden box containing Amsler's integraph
Abdank-Abakanowicz integraph made by G. Coradi, Zurich, with extension tracer arm, two ink pens and one lead holder, in wooden box 16 1/2" x 22" x 7" Abdank-Abakanowicz integraph made by G. Coradi
Prototype model integraph with wooden case by Stanley, London. Prototype model integraph with wooden case by Stanley 1949-1951