Bartlett Poppet Valve Gear, Patent Model
date: label: date made
content: 1867
label: patent date
content: 1867-01-15
name: label: inventor
content: Bartlett, Louis D.
notes: label: Description
content: This model was submitted to the U.S. Patent Office with the application for the patent issued to Louis D. 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
place: label: place made
content: United States: Massachusetts
label: associated place
content: United States: Massachusetts, Fitchburg
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
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: MC.308674
label: catalog number
content: 308674
label: accession number
content: 89797
label: patent number
content: 61,141
objectType: label: Object Name
content: valve, steam engine, model
label: Object Name
content: patent model, valve, steam engine
label: Object Type
content: Patent Model
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