Keywords: Giovanni Poleni calc.png en Pinwheel calculator schema published in 1709 by Giovanni Poleni 1683-1761 1709 Google books http //books google cat/books id 3WtbAAAAQAAJ creator Giovanni Poleni other versions Custom license marker 2014 11 12 PD-old-100 Uploaded with UploadWizard Giovanni Poleni 1709 in science |