1839, Jacob Pratt's Patent Model of a Silk Reeling, Spinning, and Twisting Machine
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In his patent application file, his specification makes four claims. Out of those four, only one was approved by Charles M. Keller, the patent examiner, and that claim was for using a trough of zinc. The trough held spools of silk fibers prior to spinning and was filled with warm water, which kept the fibers from sticking together."}, {"label": "Description", "content": "The Journal of the Franklin Institute, 1840, commented: \u00e2\u0080\u009cIts construction is, in general, similar to such as is well known, and is not claimed as new . . . No particular reason is given for making the troughs of zinc, and we suppose that copper would do equally well; but from the special mention of this metal we were led to look for some ground of preference to it.\u00e2\u0080\u009d"}, {"label": "Location", "content": "Currently not on view"}], "name": [{"label": "inventor", "content": "Pratt, Jacob"}], "publisher": [{"label": "Related Publication", "content": "Janssen, Barbara Suit. Patent Models Index"}], "topic": [{"label": "subject", "content": "Patent Models"}, {"label": "subject", "content": "Invention"}], "place": [{"label": "place made", "content": "United States: Massachusetts"}], "physicalDescription": [{"label": "Physical Description", "content": "wood (overall material)"}, {"label": "Physical Description", "content": "metal (mechanisms material)"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "silk reeling, spinning, and twisting machine"}, {"label": "Object Type", "content": "Patent Model"}]}}, "url": "edanmdm:nmah_1070919", "hash": "12d7daed85173c30e6ebf39a57c8394add5811a2", "docSignature": "c2b634df0706e319cce60648c3d04a10", "timestamp": 1664883026, "lastTimeUpdated": 1664882972, "title": "1839, Jacob Pratt's Patent Model of a Silk Reeling, Spinning, and Twisting Machine"}