Patent Model for an Adder with Carry Invented by George Farmer
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The bottom disc is numbered from 1 to 99 clockwise around its toothed edge, to represent hundreds and thousands. Above it is a smaller disc, also with teeth around the edge, numbered from 00 to 99 clockwise to represent units and tens. A window in the third, top, largest disc shows the result on the dials below. The largest disc is numbered from 1 to 100 around the edge. Atop this disc is a rotating arm. Moving the arm counterclockwise advances the inner disc proportionally, allowing one to enter numbers up to 99."}, {"label": "Description", "content": "A lever extends from the side of the disc and bends over the top. If the arm rotates around a full 100 units, it pushes this lever, causing a carry. The lever also may be used to zero the hundreds and thousands digits. See U.S. patent 69,647 for \u00e2\u0080\u009cImprovement in Tallying Instrument.\u00e2\u0080\u009d According to the patent, the invention \u00e2\u0080\u009crelates to a new and improved method of registering or tallying the quantity of lumber measured, or keeping account of sums of money paid out or received . . .\u00e2\u0080\u009d"}, {"label": "Description", "content": "There was a George Farmer (born about 1831 in England, died 1880 in Saginaw, Michigan) who worked as a miller and shingle maker in Illinois and in Michigan. He is listed in the 1860 U.S. Census as living in Elmira in Stark County, Illinois, working as a miller. That same year he received a patent on August 21for an improvement in harvesters (#29685). By 1870, he was living in Saginaw, Michigan, still working as a miller. In the 1880 Census he is listed as a shingle manufacturer. He and his son, Albion, ran a shingle-making business in Saginaw under the name of George Farmer & Son. It is listed in the 1878 city directory for the town. The George Farmer who received the patent for this adder was a resident of Flint, which is near Saginaw."}, {"label": "Description", "content": "Reference: George Farmer, \u00e2\u0080\u009cImprovement in Tallying Instrument,\u00e2\u0080\u009d U.S. Patent 69,647, granted October 8, 1867."}, {"label": "Location", "content": "Currently not on view"}], "name": [{"label": "patentee", "content": "Farmer, George"}, {"label": "maker", "content": "Farmer, George"}], "topic": [{"label": "subject", "content": "Mathematics"}], "place": [{"label": "place made", "content": "United States: Michigan, Flint"}, {"label": "place patented", "content": "United States: Michigan, Flint"}], "physicalDescription": [{"label": "Physical Description", "content": "brass (overall material)"}, {"label": "Measurements", "content": "overall: 1.2 cm x 10.7 cm x 10.7 cm; 15/32 in x 4 7/32 in x 4 7/32 in"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "adder with carry"}, {"label": "Object Type", "content": "Patent Model"}]}}, "url": "edanmdm:nmah_690832", "hash": "c90fee50dae1d556fbb2e00e1c22b28202eb8fc2", "docSignature": "2bc7d7c81fa65d3f59de47a044a680be", "timestamp": 1663782564, "lastTimeUpdated": 1655973454, "title": "Patent Model for an Adder with Carry Invented by George Farmer"}