Map Tracking a Tornado, by Lapham, Increase Allen 1811-1875, August 21, 1857, Smithsonian Archives - History Div, Map showing the path of a tornado through the counties of Columbia, Dodge and Washington in Wisconsin sent to the Smithsonian Meteorological Project. The tornado had passed over the eastern portion of Wisconsin on August 21, 1857. See note accompanying map from I. A. Lapham (SIA2010-0730)..