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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.
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 ...
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.
The American Viscose Plant Historic District is an industrial park and historic district located in Roanoke, Virginia. The site is the location of the former American Viscose Corporation rayon processing plant that once employed over 5,000 and for a time was reportedly the largest rayon producing mill in the world.
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 ...
After a few hours atmospheric pressure built up in a brass vessel causing it to pump water into adjacent containers. These containers acted as weights that – through a series of ropes and pulleys – would open the temple's doors at about the time people were to arrive for prayer. Heron used a similar application to open the gates to the city ...