Sharpenhoe is the name of a house at 132 Red Stone Hill in Plainville. This Colonial Revival home was built in 1921-1922 for Charles Hotchkiss Norton (1851-1942), a mechanical engineer and designer of machine tools. In the 1890s, Norton invented a heavy-duty cylindrical grinding machine capable of supplying machine parts for automobiles. The Charles H. Norton House was designed by Isaac A. Allen, Jr. of Hartford. As described in Modern Connecticut Homes and Homecrafts (1921): “this dwelling of red brick with garage attached is an exceptionally happy conception of the hip roof type of Colonial house with dormer windows. The design everywhere evidences a refinement of taste in the choice of its carefully considered decorative details.” Norton’s family continued to live in the house until about 1958.