Loper Marine Steam Engine, Patent Model
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F."], "topic": ["Manufacturing industries", "Engineering", "Industrialization", "Bulletin 173", "Architecture"], "place": ["United States", "Philadelphia", "Pennsylvania"], "online_media_type": ["Images"]}, "freetext": {"setName": [{"label": "See more items in", "content": "Work and Industry: Mechanical and Civil Engineering"}, {"label": "See more items in", "content": "Bulletin 173"}, {"label": "See more items in", "content": "Engineering, Building, and Architecture"}, {"label": "See more items in", "content": "Work"}, {"label": "See more items in", "content": "Industry & Manufacturing"}], "date": [{"label": "date made", "content": "1849"}, {"label": "patent date", "content": "1849-08-28"}], "identifier": [{"label": "ID Number", "content": "ER.309198"}, {"label": "accession number", "content": "89797"}, {"label": "catalog number", "content": "309198"}, {"label": "patent number", "content": "6,673"}], "notes": [{"label": "Description", "content": "This model was submitted to the U.S. Patent Office with the application for the patent issued to R. F. Loper, of Philadelphia, Pennsylvania, August 28, 2849, no. 6673."}, {"label": "Description", "content": "This is a nicely made working model of a 2-cylinder vertical marine engine directly connected to a 2-throw propeller shaft, upon which is mounted a 4-blade propeller. The model is complete with boiler, feed-water pump, condenser, and condenser air pump. The peculiar feature of the invention is the manner of connecting the air pump to the engine and the method of quickly converting the engine from condensing to noncondensing operation."}, {"label": "Description", "content": "The engine represented consists of a heavy bed plate shaped to fit the hull of a vessel, upon which are attached the bearing of the propeller shaft and the frame that supports the cylinders. The cylinders are double-acting are \u00e2\u0080\u009creversed from the ordinary position of engines, the piston rod running down through the lower head and connecting by the usual connecting rod with the cranks on the shaft below.\u00e2\u0080\u009d \u00e2\u0080\u009cThe valves of the engine take their motion from eccentrics on the main shaft coupled with a valve lever by proper eccentric rods. The lever is affixed to its axis by its center and is made double, so that the eccentric rod can be thrown to either end to reverse the motion or may be wholly detached.\u00e2\u0080\u009d The cur-off is worked directly from the cross head. The air pump is driven by a beam and connecting rod, which is driven by a crankpin upon a gear wheel that engages a pinion on the crankshaft. The ratio of the gears is such that the air pump performs only one stroke to two of the engine. The air pump communicates with the condenser into which the exhaust pipe opens. The escape pipe is also connected with the condenser, which, when open, allows the steam to escape without condensing."}, {"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": "Loper, R. F."}], "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: Pennsylvania"}, {"label": "associated place", "content": "United States: Pennsylvania, Philadelphia"}], "physicalDescription": [{"label": "Measurements", "content": "overall: 7 7/8 in x 4 1/2 in x 18 1/4 in; 20.0025 cm x 11.43 cm x 46.355 cm"}, {"label": "Measurements", "content": "overall - from catalog card: 4 in x 18 in; 10.16 cm x 45.72 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "engine, steam, marine with air pumps, model"}, {"label": "Object Name", "content": "patent model, engine, reciprocating steam"}, {"label": "Object Type", "content": "Patent Model"}]}}, "url": "edanmdm:nmah_1072129", "hash": "414d473ee9f04470c63068b79f5f3646fa408c19", "docSignature": "1add4ab08dea77a169c61d3219ad7772", "timestamp": 1663781938, "lastTimeUpdated": 1655973429, "title": "Loper Marine Steam Engine, Patent Model"}