Hi, Lucy. You might want to contact the Pendarvis museum in Mineral Point, Wisconsin. It's a property of the State Historical Society of Wisconsin, and is a collection of several mid-19th century cottages built/lived in by Cornish emigrant lead miners. There's a bit of info at www.shsw.wisc.edu/sites/pend but if you contact the staff they might give you further information on Cornish emigration during that era (1830s and 40s). All the best, Margaret