Loper Marine Steam Engine, Patent Model
date: label: date made
content: 1849
label: patent date
content: 1849-08-28
name: label: inventor
content: Loper, R. F.
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 “reversed 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.” “The 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.” 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
place: label: place made
content: United States: Pennsylvania
label: associated place
content: United States: Pennsylvania, Philadelphia
setName: label: See more items in
content: Work and Industry: Mechanical and Civil Engineering
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content: Bulletin 173
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content: Engineering, Building, and Architecture
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content: Work
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content: Industry & Manufacturing
publisher: label: Related Publication
content: Frank A. Taylor. Catalog of the Mechanical Collections of the Division of Engineering United States National Museum, Bulletin 173
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: ER.309198
label: accession number
content: 89797
label: catalog number
content: 309198
label: patent number
content: 6,673
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
physicalDescription: label: Physical Description
content: metal (overall material)
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