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USS Cairo Engine and Boilers
Society: ASMEMain Category: MechanicalSub Category: Water TransportationEra: 1860-1869DateCreated: 1862 National BattlefieldVicksburgState: MSZip: 39183Country: USAWebsite: http://www.asme.org/about-asme/history/landmarks/topics-m-z/water-transportation/-143-uss-cairo-engine-and-boilers-%281862%29Creator: Pook, Samuel , Eads, James

The Cairo is the sole survivor of the fleet of river gunboats built by the Union during the Civil War with the object of controlling the lower Mississippi River. Designed by Samuel Pook and built by James B. Eads, it saw limited battle and was sunk on the Yazoo River in 1862 by newly developed electronically detonated mines, becoming the first craft ever sunk by this predecessor to torpedo technology. The 175-foot ironclad vessel had 13 guns.

Image Credit: Courtesy Flickr/James Case (CC BY 2.0)Image Caption: USS Cairo Engine and BoilersEra_date_from: 1862
Cabin John Aqueduct
Society: ASCEMain Category: CivilSub Category: Bridges, Transportation, Water Supply & ControlEra: 1860-1869DateCreated: 1864Cabin JohnState: MDCountry: USAWebsite: http://www.asce.org/Project/Cabin-John-Aqueduct/Creator: Meigs, Montgomery

Cabin John Aqueduct, designed by Montgomery C. Meigs, conveys drinking water from Great Falls, Maryland to Washington, D.C. It was the longest stone masonry arch in the world for nearly 40 years. The segmental arch of the bridge has a span of 220 feet and a rise of only 57 feet. The main arch ring is built of cut and dressed granite. The secondary arch ring is radially-laid sandstone, of which the rest of the bridge is also constructed. 

YearAdded:
1972
Image Credit: Public Domain (Author's Choice)Image Caption: Cabin John AqueductEra_date_from: 1864
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