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1931

Pickup Forage Harvester
Society: ASABEMain Category: Agricultural & BiologicalSub Category: Equipment, Harvesting and BalingEra: 1930-1949DateCreated: 1931Agricultural Engineering Laboratory, University of WisconsinMadisonState: WIZip: 53911Country: USAWebsite: https://www.asabe.org/awards-landmarks/asabe-historic-landmarks/forage-harvester-22.aspxCreator: Saiberlich, Erwin W.

William J. Conroy Of Aylmer, Quebec, Received Patent No. 465,127 On The First Field Hay Chopper On 15 December, 1891. Its Sickle Cut The Crop, Which Was Elevated Directly Into A Cylindrical Curved-Bar Cutterhead. It Was Not Commercially Successful, But It Recognized The Need.

Professor Floyd Waldo Duffee, Agricultural Engineering Department, University Of Wisconsin, Built And Field Tested A Silo Filler With An Attached Hay Loader In 1926. He Presented The Specifications Of A Complete Unified Harvester To The National Asabe Meeting In 1927.

YearAdded:
1988
Image Credit: Courtesy Flickr/Bob Adams (CC BY-SA 2.0)Image Caption: Claas Jaguar 870 forage harvester with pickup header
Grain Aeration
Society: ASABEMain Category: Agricultural & BiologicalSub Category: StorageEra: 1930-1949DateCreated: 1931Sukup HallAmesState: IAZip: 50011Country: USAWebsite: https://www.asabe.org/awards-landmarks/asabe-historic-landmarks/grain-aeration-39.aspxCreator: Fenton, F. L.

Tests Of Grain Aeration To Cool And Dry Combine-Harvested Wheat By F. L. Fenton, C. O. Swanson, And Orval C. French At Kansas State University In 1930-31 Showed Mechanical Ventilation To Be More Effective Than Natural Draft Ventilation. Mechanical Aeration Was Further Developed In The 1940's To Prevent Moisture Migration, Which Caused Wetting And Spoilage Of The Top Layers Of Stored Grain. Studies In 1944-45 By Usda Agricultural Engineers G. W. French And W. V. Hukill Cooperating With Iowa State University Proved That Mechanical Aeration Prevented Moisture Migration. G. H.

YearAdded:
2001
Waldo-Hancock Suspension Bridge
Society: ASCEMain Category: CivilSub Category: BridgesEra: 1930-1939DateCreated: 1931Penobscot RiverStockton SpringsState: MEZip: E 04981Country: USAWebsite: http://www.asce.org/Project/Waldo-Hancock-Suspension-Bridge/Creator: Steinman, David

Designed by David B. Steinman, of Robinson & Steinman, New York City, the Waldo-Hancock suspension Bridge is a significant example of Steinman's work. David Steinman is considered among the most important suspension bridge designers of the 20th century. He earned an engineering degree from Columbia University in 1909 and went on to apprentice with Gustav Lindenthal, then at work on New York's Hell Gate Bridge. In the 1920's, Steinman emerged as an outstanding and innovative suspension bridge designer.

YearAdded:
2002
Image Credit: Courtesy Flickr/Justin Russell (CC BY 2.0)Image Caption: Waldo-Hancock Suspension BridgeEra_date_from: 1931
Rogue River Bridge
Society: ASCEMain Category: CivilSub Category: BridgesEra: 1930-1939DateCreated: 1931Rogue RiverGold BeachState: ORZip: 97444Country: USAWebsite: http://www.asce.org/Project/Rogue-River-Bridge/Creator: McCullough, Conde

The Rogue River Bridge was the most advanced concrete bridge in America when it was built. Distinguished bridge engineer Conde McCullough employed the techniques of Frenchman Eugene Freyssinet to create thin, graceful concrete arches for this seven-span structure.

Pre-compression of the concrete arch was achieved and, as a result of its success, pre-stressing became one of the hallmarks of American bridge building techniques.

YearAdded:
1982
Image Credit: Courtesy Flickr/Bruce Fingerhood (CC BY 2.0)Image Caption: Rogue River BridgeEra_date_from: 1931
Bayonne Bridge
Society: ASCEMain Category: CivilSub Category: Bridges, TransportationEra: 1930-1939DateCreated: 1931Kill Van Kull tidal straitStaten IslandState: NYZip: 10302Country: USAWebsite: http://www.asce.org/Project/Bayonne-Bridge/Creator: Ammann, Othmar

The longest steel-arch bridge in the world for 46 years, the Bayonne Bridge continues to be celebrated today as a major aesthetic and technical achievement. The 1,675-foot bridge replaced a ferry service which until then was the only means of crossing from  the Bayonne peninsula to Staten Island. While providing this essential link in the transportation network of greater New York City, the bridge's mid-span clearance of 150 feet also allows for unobstructed navigation on Newark Bay, the main shipping channel to the inland ports of Newark and Elizabeth, New Jersey.

YearAdded:
1985
Image Credit: Courtesy Flickr/Raymond Bucko (CC BY 2.0)Image Caption: The graceful Bayonne Bridge was the longest steel-arch bridge in the world for 46 years.Era_date_from: 1931
George Washington Bridge
Society: ASCEMain Category: CivilSub Category: BridgesEra: 1930-1939DateCreated: 1931George Washington BridgeFort LeeState: NJZip: 07024Country: USAWebsite: http://www.asce.org/Project/George-Washington-Bridge/Creator: Ammann, Othmar

"An essential part of the human experience is to create an aesthetic atmosphere."

The George Washington Bridge represented a departure in suspension bridge design. Chief Engineer O.H. Ammann developed a system of stiffening trusses that offered greater flexibility and saved the project nearly $10 million. Initially, just six of the upper eight lanes were paved, but Ammann designed the bridge to easily accommodate a future lower level.

Swiss-born O.H. Ammann (1879-1965) was Chief Engineer for the Port Authority of New York and New Jersey during the bridge's construction. 

YearAdded:
1981
Image Credit: Original Image: Flickr/Marcin WicharyImage Caption: George Washington BridgeEra_date_from: 1931
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