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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 ...
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.
Southwest Historic District is a national historic district located at Roanoke, Virginia. It encompasses 1,547 contributing buildings constructed between 1882 and 1930 in the Roanoke neighborhoods of Old Southwest, Mountain View, and Hurt Park. It is a primarily residential district with houses in a variety of popular late-19th and early-20th ...
It first owner was John Potts, Jr., who built the house in 1795. [3] [6] The house was built simultaneously with its neighboring structure at 609 Oronoco Street, which became the Hallowell School (Benjamin Hallowell tutored Robert E. Lee as he prepared to enter West Point.) [7] Potts was the Secretary of the Potomac Canal Company under George Washington, the company's president. [8]