"Arithmograph" of Leon Bollee
- maker:
- Leon Bollee
"Arithmograph" of Leon Bollee, with stylus, instructions for use and sets of mathematical tables printed on two cards, together with a tin mask, 2" x 1 3/8"
"Arithmograph" of Leon Bollee, with stylus, instructions for use and sets of mathematical tables printed on two cards, together with a tin mask, 2" x 1 3/8"