Baldwin pinwheel machine

source: Monroe Calc. Company

source: Monroe Calc. Company

patent model

source: Smithsonian Institution / photo: Cris Vande Velde

source: Smithsonian Institution / photo: Cris Vande Velde

source: Smithsonian Institution / photo: Cris Vande Velde

source: Smithsonian Institution / photo: Cris Vande Velde

source: Smithsonian Institution / photo: Cris Vande Velde

source: Smithsonian Institution / photo: Cris Vande Velde

source: Pook & Pook, Inc., photographer Kyle Pook

last updated: 08-Apr-11