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Bollman Truss
The Bollman Truss Railroad Bridge across the Little Patuxent River at Savage, Maryland, is one of the oldest standing iron railroad bridges in the United States and the sole surviving example of a revolutionary design in the history of American bridge engineering. The double-span was built in 1852 at an unknown location on the main line of the Baltimore and Ohio Railroad. It was moved 35 years later to its present location, where it replaced the very first Bollman bridge. Today, it carries the Savage Mill Trail. The Bollman design, a suspension truss bridge, was the first successful all-metal bridge design to be adopted and consistently used on a railroad. The type was named for its inventor, Wendel Bollman, a self-educated Baltimore civil engineer. Bollman formed two companies in Baltimore, the W. Bollman and Company and the Patapsco Bridge Company, to market the bridge in North and South America. In 1966, the American Society of Civil Engineers designated the bridge as the f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patuxent River
The Patuxent River is a tributary of the Chesapeake Bay in the state of Maryland. There are three main river drainages for central Maryland: the Potomac River to the west passing through Washington, D.C., the Patapsco River to the northeast passing through Baltimore, and the Patuxent River between the two. The Patuxent watershed had a rapidly growing population of 590,769 in 2000. It is the largest and longest river entirely within Maryland, and its watershed is the largest completely within the state. Geography The river source, from the Chesapeake, is in the hills of the Maryland Piedmont near the intersection of four counties – Howard, Frederick, Montgomery and Carroll, and only from Parr's Spring, the source of the south fork of the Patapsco River. Flowing in a generally southeastward direction, the Patuxent crosses the urbanized corridor between Baltimore and Washington, D.C., and opens up into a navigable tidal estuary near the colonial seaport of Queen A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Bridges On The National Register Of Historic Places In Maryland
This is a list of bridges and tunnels on the National Register of Historic Places in the U.S. state of Maryland. References {{NRHP bridges Bridges on the National Register of Historic Places in Maryland, Lists of bridges on the National Register of Historic Places by state, Maryland Maryland transportation-related lists, Bridges Lists of buildings and structures in Maryland, Bridges ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Historic Civil Engineering Landmarks
__NOTOC__ The following is a list of Historic Civil Engineering Landmarks as designated by the American Society of Civil Engineers since it began the program in 1964. The designation is granted to projects, structures, and sites in the United States (National Historic Civil Engineering Landmarks) and the rest of the world (International Historic Civil Engineering Landmarks). As of 2019, there are over 280 landmarks that have been approved by the ASCE Board of Direction. Sections or chapters of the American Society of Civil Engineers may also designate state or local landmarks within their areas; those landmarks are not listed here. See also *[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Bridges Documented By The Historic American Engineering Record In Maryland
__NOTOC__ This is a list of bridges documented by the Historic American Engineering Record in the US state of Maryland. Bridges See also *List of bridges on the National Register of Historic Places in Maryland This is a list of bridges and tunnels on the National Register of Historic Places in the U.S. state of Maryland. References {{NRHP bridges Bridges on the National Register of Historic Places in Maryland, Lists of bridges on the Nationa ... * List of covered bridges in Maryland * List of tunnels documented by the Historic American Engineering Record in Maryland References {{HAER list, structure=bridge Bridges in Maryland, *List Historic American Engineering Record in Maryland, *List Lists of bridges documented by the Historic American Engineering Record, Maryland Lists of buildings and structures in Maryland, Bridges Maryland transportation-related lists, Bridges ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ilchester MD Bollan Truss Bridge For B&O RR Over Patapsco River
Ilchester is a village and civil parish, situated on the River Yeo or Ivel, five miles north of Yeovil, in the English county of Somerset. Originally a Roman town, and later a market town, Ilchester has a rich medieval history and was a notable settlement in the county; around the 12th and 13th centuries it was effectively the county town. It had, however, declined in size and importance by the beginning of the 18th century, and the last markets were held in 1833.Local Histories Ilchester In 1889 the historic corporation that had governed the town (the Bailiff and Burgesses) was dissolved.Ilchester Parish Council - Ilchester Town Trust ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doric Order
The Doric order was one of the three orders of ancient Greek and later Roman architecture; the other two canonical orders were the Ionic and the Corinthian. The Doric is most easily recognized by the simple circular capitals at the top of columns. Originating in the western Doric region of Greece, it is the earliest and, in its essence, the simplest of the orders, though still with complex details in the entablature above. The Greek Doric column was fluted or smooth-surfaced, and had no base, dropping straight into the stylobate or platform on which the temple or other building stood. The capital was a simple circular form, with some mouldings, under a square cushion that is very wide in early versions, but later more restrained. Above a plain architrave, the complexity comes in the frieze, where the two features originally unique to the Doric, the triglyph and gutta, are skeuomorphic memories of the beams and retaining pegs of the wooden constructions that preceded stone Do ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bollman Bridge Elementary School
The Howard County Public School System (HCPSS) is the school district that manages and runs the public schools of Howard County, Maryland. It operates under the supervision of an elected, eight-member Board of Education. Antonia Watts is the chair of the board. Michael J. Martirano has served as the superintendent since May 2017. The district operates 77 schools: 42 elementary schools, 20 middle schools, 12 high schools, and 3 special education schools/education centers. As of September 2019, a total of 58,868 students were enrolled. It is headquartered in the Columbia, Maryland census-designated place; the facility has an Ellicott City mailing address. Howard County consistently earns high marks in school performance metrics such as test scores and graduation rates. It gets high percentages at all levels of the Maryland School Assessments. In 2007, Forbes magazine rated Howard County as one of the ten most cost-efficient school systems in the United States. Overview The distr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Howard County, Maryland
Howard County is located in the U.S. state of Maryland. As of the 2010 census, the population was 287,085. As of the 2020 census its population rose to 328,200. Its county seat is Ellicott City. Howard County is included in the Baltimore-Columbia-Towson, MD Metropolitan Statistical Area, which is also part of the larger Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area. Recent south county development has led to some realignment towards the Washington, D.C. media and employment markets. The county is home to Columbia, a major planned community of approximately 100,000 founded in 1967. Howard County is frequently cited for its affluence, quality of life, and excellent schools. Its estimated 2016 median household income of $120,194 raised it to the second-highest median household income of any U.S. county. Many of the most affluent communities in the area, such as Clarksville, Dayton, Glenelg, Glenwood, and West Friendship, are located along the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AERIAL VIEW OF BRIDGE FROM EAST - Baltimore And Ohio Railroad, Bollman Truss Bridge, Spanning Little Patuxent River, Savage, Howard County, MD HAER MD,14-SAV,1-1
Aerial may refer to: Music * ''Aerial'' (album), by Kate Bush * ''Aerials'' (song), from the album ''Toxicity'' by System of a Down Bands *Aerial (Canadian band) * Aerial (Scottish band) * Aerial (Swedish band) Performance art *Aerial silk, apparatus used in aerial acrobatics *Aerialist, an acrobat who performs in the air Recreation and sport *Aerial (dance move) *Aerial (skateboarding) *Aerial adventure park, ropes course with a recreational purpose * Aerial cartwheel (or side aerial), gymnastics move performed in acro dance and various martial arts *Aerial skiing, discipline of freestyle skiing *Front aerial, gymnastics move performed in acro dance Technology Antennas *Aerial (radio), a radio ''antenna'' or transducer that transmits or receives electromagnetic waves **Aerial (television), an over-the-air television reception antenna Mechanical *Aerial fire apparatus, for firefighting and rescue *Aerial work platform, for positioning workers Optical *Aerial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wills Creek Bollman Bridge
The Wills Creek Bollman Bridge originally served the Baltimore and Ohio Railroad's Pittsburgh Division main line. Designed by the self-taught civil engineer Wendel Bollman in 1871, this truss bridge is the last remaining span of the Pittsburgh Division line associated with Bollman. Around 1910, it was moved from Wills Creek to a location north of Meyersdale, Pennsylvania, after it was no longer able to safely carry heavier modern locomotives. It served as a vehicular bridge crossing CSX tracks on Long Road (Summit Township Road 381) at . The bridge was again relocated in 2007 to a location east of Meyersdale, where it now carries the Great Allegheny Passage trail over Scratch Hill Road at . Though it was designed by Wendell Bollman, it does not employ his famous Bollman truss, but rather a Warren truss. It is long and wide. The east abutments are constructed of concrete, while the west are earthen with wood ties. This bridge has a wood deck, and ornate cast iron end pieces, lac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cast Iron
Cast iron is a class of iron–carbon alloys with a carbon content more than 2%. Its usefulness derives from its relatively low melting temperature. The alloy constituents affect its color when fractured: white cast iron has carbide impurities which allow cracks to pass straight through, grey cast iron has graphite flakes which deflect a passing crack and initiate countless new cracks as the material breaks, and ductile cast iron has spherical graphite "nodules" which stop the crack from further progressing. Carbon (C), ranging from 1.8 to 4 wt%, and silicon (Si), 1–3 wt%, are the main alloying elements of cast iron. Iron alloys with lower carbon content are known as steel. Cast iron tends to be brittle, except for malleable cast irons. With its relatively low melting point, good fluidity, castability, excellent machinability, resistance to deformation and wear resistance, cast irons have become an engineering material with a wide range of applications and are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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