Baldwin's Patent Model of a Flexible Beam Locomotive - ca 1842
{"id": "ld1-1643399486815-1643399503591-0", "version": "", "unitCode": "NMAH", "linkedId": "", "type": "edanmdm", "content": {"descriptiveNonRepeating": {"record_ID": "nmah_843732", "online_media": {"mediaCount": 2, "media": [{"thumbnail": "https://ids.si.edu/ids/deliveryService?id=SIA-89-6732-000002&max=150", "idsId": "SIA-89-6732-000002", "usage": {"access": "CC0"}, "guid": "http://n2t.net/ark:/65665/bq99ca746bb-a30f-704b-e053-15f76fa0b4fa", "type": "Images", "content": "https://ids.si.edu/ids/deliveryService?id=SIA-89-6732-000002", "resources": [{"label": "High-resolution TIFF", "url": "https://ids.si.edu/ids/download?id=SIA-89-6732-000002.tif", "width": 5399, "height": 3504}, {"width": 5399, "height": 3504, "label": "High-resolution JPEG", "url": "https://ids.si.edu/ids/download?id=SIA-89-6732-000002.jpg", "dimensions": "5399x3504"}, {"label": "Screen Image", "url": "https://ids.si.edu/ids/download?id=SIA-89-6732-000002_screen"}, {"label": "Thumbnail Image", "url": "https://ids.si.edu/ids/download?id=SIA-89-6732-000002_thumb"}]}, {"thumbnail": "https://ids.si.edu/ids/deliveryService?id=NMAH-JN2015-5132&max=150", "idsId": "NMAH-JN2015-5132", "usage": {"access": "CC0"}, "guid": "http://n2t.net/ark:/65665/bq99ca746ba-0e02-704b-e053-15f76fa0b4fa", "type": "Images", "content": "https://ids.si.edu/ids/deliveryService?id=NMAH-JN2015-5132", "resources": [{"label": "High-resolution TIFF", "url": "https://ids.si.edu/ids/download?id=NMAH-JN2015-5132.tif", "width": 3000, "height": 2250}, {"width": 3000, "height": 2250, "label": "High-resolution JPEG", "url": "https://ids.si.edu/ids/download?id=NMAH-JN2015-5132.jpg", "dimensions": "3000x2250"}, {"label": "Screen Image", "url": "https://ids.si.edu/ids/download?id=NMAH-JN2015-5132_screen"}, {"label": "Thumbnail Image", "url": "https://ids.si.edu/ids/download?id=NMAH-JN2015-5132_thumb"}]}]}, "unit_code": "NMAH", "title_sort": "BALDWIN'S PATENT MODEL OF A FLEXIBLE BEAM LOCOMOTIVE - CA 1842", "guid": "http://n2t.net/ark:/65665/ng49ca746a6-854d-704b-e053-15f76fa0b4fa", "title": {"label": "Title", "content": "Baldwin's Patent Model of a Flexible Beam Locomotive - ca 1842"}, "metadata_usage": {"access": "CC0"}, "data_source": "National Museum of American History"}, "indexedStructured": {"exhibition": [{"exhibitionTitle": "Inventing In America", "building": "NMAH"}], "geoLocation": [{"Other": {"type": "Place", "content": "United States"}}, {"Other": {"type": "Place", "content": "Pennsylvania"}}, {"Other": {"type": "Place", "content": "Philadelphia"}}, {"points": {"point": {"latitude": {"type": "decimal", "content": "39.95"}, "longitude": {"type": "decimal", "content": "-75.15"}}}}], "object_type": ["Patents", "Models", "patent model, locomotive", "locomotive, flexible-beam, 1842; patent model, locomotive; patent model; Rail"], "name": ["Baldwin, Matthias W."], "onPhysicalExhibit": ["Yes"], "topic": ["Trains", "Steam Engines", "Engineering", "Patents", "Architecture", "Transportation", "Models (representations)"], "place": ["United States", "Philadelphia", "Pennsylvania"], "online_media_type": ["Images"]}, "freetext": {"setName": [{"label": "See more items in", "content": "Work and Industry: Transportation, Railroad"}, {"label": "See more items in", "content": "Engineering, Building, and Architecture"}, {"label": "See more items in", "content": "Transportation"}, {"label": "See more items in", "content": "Patent Models"}, {"label": "Exhibition", "content": "Inventing In America"}, {"label": "Exhibition Location", "content": "National Museum of American History"}], "date": [{"label": "date made", "content": "ca 1842"}, {"label": "date made", "content": "ca. 1842"}, {"label": "patent date", "content": "1842-08-25"}], "identifier": [{"label": "ID Number", "content": "TR.251274"}, {"label": "catalog number", "content": "251274"}, {"label": "patent number", "content": "2,759"}, {"label": "accession number", "content": "48865"}], "notes": [{"label": "Description", "content": "This model was filed with the application to the U.S. Patent Office for Patent Number 2,759 issued to Matthias W. Baldwin on August 25, 1842. Baldwin\u00e2\u0080\u0099s invention was a design for a flexible beam truck for the driving wheels of a locomotive. The goal of the design was to increase the proportion of the engine\u00e2\u0080\u0099s total weight resting on driven wheels thus improving traction and thereby the ability of the engine to pull heavier loads. While then existing locomotives had multiple driven axles, their designs made them unsuitable for use on the tight curves that were common on American railroads at the time. Baldwin\u00e2\u0080\u0099s design allowed for multiple driving wheel axles to be coupled together in a manner that would allow each axle to move independently so as to conform to both to sharp curves and to vertical irregularities in the tracks. The \u00e2\u0080\u009cflexible beam\u00e2\u0080\u009d referred to heavy iron beams that were connected to each side of the engine\u00e2\u0080\u0099s frame with a vertical, spherical pin so that they could pivot horizontally and vertically in relation to the frame. The beams on each side of the frame moved independently of each other. At each end of the beams were journal boxes for the axles, and these boxes were constructed to an earlier Baldwin patent with cylindrical pedestals that allowed them to rotate vertically inside the beam. The result was that when rounding a curve one driving axle could move laterally in one direction while the other axle could move independently in the other direction thus adapting the wheels to the curve while at the same time keeping the axles parallel to each other. The coupling rods were made with ball-and-socket joints to allow them to adapt to the varying geometry due to lateral axle motion. While this geometry would also result in the coupling rod lengths varying as the axles moved laterally, in actual use the variation was very small \u00e2\u0080\u0093 on the order of 1/32 of an inch \u00e2\u0080\u0093 and was allowed for via a designed-in slackness in the bearings. The patent was applied by Baldwin to a large number of engines manufactured up until 1859 when the design was superseded by heavier and more advanced engines."}, {"label": "Description", "content": "The patent model is constructed of wood and metal and is mounted on rails attached to a wooden base. A brass plate attached to the boiler is inscribed with \u00e2\u0080\u009cM.W. Baldwin Philadelphia.\u00e2\u0080\u009d The boiler is painted wood as are the cylinders and coupling rods. The engine frame is steel, and the wheel rims are made of brass. The key element of the patent, the flexible beams are present on the front two axles. The beams and leaf springs are made of wood. The vertical pins appear to be made of steel. While the axle journal boxes are shown it appears the details of the cylindrical pedestals and other moving parts are not modelled."}], "name": [{"label": "inventor", "content": "Baldwin, Matthias W."}], "topic": [{"label": "subject", "content": "Locomotives"}, {"label": "subject", "content": "Steam Engines"}, {"label": "subject", "content": "Patent Models"}], "place": [{"label": "associated place", "content": "United States: Pennsylvania, Philadelphia"}], "physicalDescription": [{"label": "Physical Description", "content": "wood (overall material)"}, {"label": "Physical Description", "content": "metal (overall material)"}, {"label": "Measurements", "content": "overall: 7 1/8 in x 9 3/4 in x 7 3/8 in; 18.0975 cm x 24.765 cm x 18.7325 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "patent model, locomotive"}, {"label": "Object Type", "content": "Patent Model"}, {"label": "Other Terms", "content": "locomotive, flexible-beam, 1842; patent model, locomotive; patent model; Rail"}]}}, "url": "edanmdm:nmah_843732", "hash": "81a83fdc09d1b1b927d435170ac188370ef0e5e9", "docSignature": "20cb45a5ef03b3acda9091c1a1e31375", "timestamp": 1663782597, "lastTimeUpdated": 1655973788, "title": "Baldwin's Patent Model of a Flexible Beam Locomotive - ca 1842"}