Skip to main content

Bessemer

Smithfield Street Bridge
Society: ASCEMain Category: CivilSub Category: BridgesEra: 1880-1889DateCreated: 1883Monongahela RiverPittsburghState: PAZip: 15222Country: USAWebsite: http://www.asce.org/Project/Smithfield-Street-Bridge/Creator: Lindenthal, Gustav

Three rivers - the Allegheny, Monongahela, and Ohio - join in Pittsburgh, making the city a natural site for the building of bridges. But the Smithfield Street Bridge stands apart from other Pittsburgh bridges for several reasons: it replaced structures by two well-known bridge engineers, Lewis Wernwag and John A. Roebling; it was the first use in America of the lenticular - or lens-shaped - truss design; and it was one of the first major bridges in the U.S. built primarily with steel.

YearAdded:
1975
Image Credit: Courtesy Flickr/RJ Schmidt (CC BY-ND 2.0)Image Caption: Smithfield Street BridgeEra_date_from: 1883
Cooper Steam Traction Engine Collection
Society: ASMEMain Category: CivilSub Category: AgricultureEra: 1860-1869DateCreated: 1860sKnox County Historical SocietyMount VernonState: OHZip: 43050Country: USAWebsite: http://www.asme.org/about-asme/history/landmarks/topics-a-l/agriculture/-201-cooper-steam-traction-engine-collection-%28late, https://www.asme.org/getmedia/4071fc96-7a0c-4d14-8f4e-5d9371c259b2/201-Cooper-Steam-Traction-Engine.aspxCreator: Cooper & Co.

These engines, built by Cooper & Co., of Mount Vernon are among the oldest surviving agricultural steam engines to show the evolution from the portable, skid-mounted engine (ca. 1860) to the horse-drawn engine (1875), through the self-propelled but horse-guided engine (1875) and finally to the self-propelled, self-steered traction engine (1883). Such engines powered the conversion to mechanized farming, which was a great hallmark of the Industrial Revolution.

YearAdded:
1998
Image Credit: Courtesy ASMEImage Caption: Cooper Self-Propelled, Self-Steering Traction EngineEra_date_from: 1860s
Subscribe to Bessemer

We hope you enjoyed this essay.

Please support this 70-year tradition of trusted historical writing and the volunteers that sustain it with a donation to American Heritage.

Donate

Stay informed - subscribe to our newsletter.
The subscriber's email address.