Collinson Manhole Cover for Boilers, Patent Model
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A curved bar of metal spans the opening over the cover and supports a threaded nut through which passes a T-handled screw by which the cover is forced against the seat. At the inner end of the screw is an eccentric head that fits in a recess in the center of the cover, so that turning the screw forces the cover against the seat and moves the center of the cover in a circle, while the friction causes the cover to rotate somewhat about its own center. The result is a combined sliding and rotating of the cover as it is forced against the seat."}, {"label": "Description", "content": "Reference:"}, {"label": "Description", "content": "This description comes from the 1939 Catalog of the Mechanical Collections of the Division of Engineering United States Museum Bulletin 173 by Frank A. Taylor."}, {"label": "Location", "content": "Currently not on view"}], "name": [{"label": "inventor", "content": "Collinson, Henry"}], "publisher": [{"label": "Related Publication", "content": "Frank A. Taylor. Catalog of the Mechanical Collections of the Division of Engineering United States National Museum, Bulletin 173"}], "place": [{"label": "place made", "content": "United States: Massachusetts"}, {"label": "associated place", "content": "United States: Massachusetts, Boston"}], "physicalDescription": [{"label": "Physical Description", "content": "brass (overall material)"}, {"label": "Measurements", "content": "overall: 4 1/4 in x 5 1/2 in x 4 3/8 in; 10.795 cm x 13.97 cm x 11.1125 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "boiler, steam, manhole cover, model"}, {"label": "Object Name", "content": "patent model, manhole cover"}, {"label": "Object Type", "content": "Patent Model"}]}}, "url": "edanmdm:nmah_1063768", "hash": "6cfdbc64c8842c6e17201c54ecb8a37ba8c4b72d", "docSignature": "f182a8c8820fc0529b469ab486cda38e", "timestamp": 1663781938, "lastTimeUpdated": 1655973429, "title": "Collinson Manhole Cover for Boilers, Patent Model"}