Bartlett Poppet Valve Gear, Patent Model
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Bartlett, of Fitchburg, Massachusetts, January 15, 1867, no. 61141."}, {"label": "Description", "content": "The patent refers to an engine with separate valve chests at head end and crank end, each enclosing balanced steam and exhaust poppet valves, and describes particularly the construction of the valve boxes. These are designed for simplicity of casting, machining, and accessibility but are difficult to describe without reference to the drawings in the patent specifications. The valve gear is said to be similar to one described in a patent granted to Charles H. Brown and Charles Burleigh, January 15, 1856. The valve stems are operated by short levers, which are raised and lowered by cams on a lay shaft paralleling the cylinder. The levers that operated the steam valves have variable fulcrums, which are controlled by a governor so that the steam can be cut off at any point of the stroke."}, {"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": "Bartlett, Louis D."}], "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, Fitchburg"}], "physicalDescription": [{"label": "Physical Description", "content": "wood (overall material)"}, {"label": "Measurements", "content": "overall: 5 in x 12 5/8 in x 8 3/8 in; 12.7 cm x 32.0675 cm x 21.2725 cm"}, {"label": "Measurements", "content": "on base - from catalog card: 8 1/2 in x 11 in; 21.59 cm x 27.94 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "valve, steam engine, model"}, {"label": "Object Name", "content": "patent model, valve, steam engine"}, {"label": "Object Type", "content": "Patent Model"}]}}, "url": "edanmdm:nmah_847082", "hash": "805d34c6b5c94f5acf966f68a24030513f7ba256", "docSignature": "e8ccb5b65faacd2a25167100f5b64157", "timestamp": 1663782597, "lastTimeUpdated": 1655973461, "title": "Bartlett Poppet Valve Gear, Patent Model"}