Mendenhall's Practical Calculator
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There are one hundred small holes around the rim of the disc. Outside the disc, on the top of the box, is a circular ring numbered from 01 to 99, with a gap at 00. Outside of this are three rings of holes, with one hundred holes in each ring. These holes are to be used to hold markers indicating digits carried when the disc makes full rotations. On the side of the box is a rotating multiplication table."}, {"label": "Description", "content": "A. Mendenhall, who patented this adder, was undoubtedly Amos Mendenhall, who was born in Ohio in 1828 and raised in east central Indiana. His father, Hiram Mendenhall (1801-1852) was a miller and farmer by trade and a Quaker and abolitionist in belief. In 1844, Hiram Mendenhall, as a representative of the Randolph County Anti-Slavery Society, presented a petition to presidential candidate Henry Clay, urging him to free his slaves. Clay refused and publicly rebuked Mendenhall. Hiram Mendenhall went on to pool his property with others to form the Unionport commune of the Society for Universal Inquiry and Reform. This effort soon collapsed and Hiram and Amos went to California to recoup the family fortunes in the gold fields. They failed to do this, and Hiram died of cholera on shipboard en route home. Amos, his mother, and his siblings continued to live in Unionport, where Amos farmed and tinkered. In the 1880 census, his occupation is given as \u00e2\u0080\u009cmanufacture.\u00e2\u0080\u009d"}, {"label": "Description", "content": "The \u00e2\u0080\u009cpractical calculator\u00e2\u0080\u009d was Mendenhall's first patented invention. He took out patents for gold mining devices (#360713, granted April 5, 1887, and # 541912, granted June 11, 1895), a tricycle (#453151, granted May 26, 1891), and a bicycle (#740156, granted September 29, 1903)."}, {"label": "Description", "content": "References: Patent #67,786, August 13, 1867 (Munn Co., attorneys); <I>Scientific American</I>, vol. 17, August 31, 1867, p. 141."}, {"label": "Description", "content": "U.S. Census records for 1860, 1880, 1900."}, {"label": "Description", "content": "Thomas D. Hamm, <I>God\u00e2\u0080\u0099s Government Begun: The Society for Universal Inquiry and Reform, 1842-1846</I>, Bloomington: Indiana University Press, 1996."}, {"label": "Location", "content": "Currently not on view"}], "name": [{"label": "patentee", "content": "Mendenhall, A."}, {"label": "maker", "content": "Mendenhall, A."}], "topic": [{"label": "subject", "content": "Mathematics"}], "place": [{"label": "place made", "content": "United States: Indiana, Cerro Gordo"}, {"label": "place patented", "content": "United States: Indiana, Cerro Gordo"}], "physicalDescription": [{"label": "Physical Description", "content": "brass (overall material)"}, {"label": "Physical Description", "content": "metal (overall material)"}, {"label": "Measurements", "content": "overall: 5.4 cm x 13 cm x 13.8 cm; 2 1/8 in x 5 1/8 in x 5 7/16 in"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "adder"}, {"label": "Object Type", "content": "Patent Model"}]}}, "url": "edanmdm:nmah_690836", "hash": "a4b515c1a21fc0f727fdddfd548aa13a1dbc36d6", "docSignature": "ffa49eaf87431ec575bd00121bbbc208", "timestamp": 1663782564, "lastTimeUpdated": 1655973454, "title": "Mendenhall's Practical Calculator"}