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Hero of Alexandria (/ ˈ h ɪər oʊ /; Ancient Greek: Ἥρων [a] ὁ Ἀλεξανδρεύς, Hērōn hò Alexandreús, also known as Heron of Alexandria / ˈ h ɛr ən /; probably 1st or 2nd century AD) was a Greek mathematician and engineer who was active in Alexandria in Egypt during the Roman era.
Heron's fountain is a hydraulic machine invented by the 1st century AD inventor, mathematician, and physicist Heron (or Hero) of Alexandria. [ 1 ] Heron studied the pressure of air and steam, described the first steam engine , and built toys that would spurt water, one of them known as Heron's fountain.
Location of Roanoke in Virginia. This is a list of the National Register of Historic Places listings in Roanoke, Virginia. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in the independent city of Roanoke, Virginia, United States. The locations of National Register properties ...
This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Roanoke County, Virginia, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in an online map.
The district began its development with George Howbert's sale of his house and farmland to the Wasena Land Company in 1910. [3] At the time the only connection to the developed portion of the city was a wooden bridge spanning the Roanoke River; that bridge was reinforced with a steel frame concurrent to the neighborhood being graded and platted (it would be 1939 before the existing span was ...
This page was last edited on 9 March 2003, at 21:45 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
The Greek-Egyptian mathematician and engineer Hero of Alexandria described the device in the 1st century AD, and many sources give him the credit for its invention. [ 1 ] [ 2 ] However, Vitruvius was the first to describe this appliance in his De architectura ( c. 30-20 BC ).
The Roanoke Downtown Historic District is a national historic district located in the Downtown Roanoke area of Roanoke, Virginia. It encompasses 122 contributing buildings. It includes a variety of commercial, institutional, social, and governmental buildings and structures from the late 19th century to the mid-20th century.