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 Mathematics
Prototype model integraph with wooden case by Stanley, London. Prototype model integraph with wooden case by Stanley Mathematics 1949-1951
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 Mathematics
