Hero of Alexandria

Hero of Alexandria (Greek: Ἥρων ὁ Ἀλεξανδρεύς, Heron ho Alexandreus; also known as Heron of Alexandria c. 10 – c. 70 AD) was a Greek mathematician and engineer who was active in his native city of Alexandria, Roman Egypt. He is considered the greatest experimenter of antiquity and his work is representative of the Hellenistic scientific tradition.

Hero published a well recognized description of a steam-powered device called an aeolipile (sometimes called a "Hero engine"). Among his most famous inventions was a windwheel, constituting the earliest instance of wind harnessing on land. He is said to have been a follower of the atomists. Some of his ideas were derived from the works of Ctesibius.

Much of Hero's original writings and designs have been lost, but some of his works were preserved in Arabic manuscripts.

Career

It is almost certain that Hero taught at the Musaeum which included the famous Library of Alexandria, because most of his writings appear as lecture notes for courses in mathematics, mechanics, physics, and pneumatics. Although the field was not formalized until the twentieth century, it is thought that the work of Hero, his automated devices in particular, represents some of the first formal research into cybernetics.

Alexandria

Alexandria (/ˌælɪɡˈzændrɪə/ or /ˌælɪɡˈzɑːndrɪə/;Arabic: الإسكندرية al-Iskandariyyah; Egyptian Arabic: اسكندرية Eskendereyyah; Coptic: Ⲣⲁⲕⲟⲧⲉ Rakotə) is the second largest city and a major economic centre in Egypt, extending about 32 km (20 mi) along the coast of the Mediterranean Sea in the north central part of the country. It is also the largest city lying directly on the Mediterranean coast. Its low elevation on the Nile delta makes it highly vulnerable to rising sea levels. Alexandria is Egypt's largest seaport, serving approximately 80% of Egypt's imports and exports. It is an important industrial center because of its natural gas and oil pipelines from Suez. Alexandria is also an important tourist destination.

Alexandria was founded around a small Ancient Egyptian town c. 331 BC by Alexander the Great. It became an important center of the Hellenistic civilization and remained the capital of Hellenistic and Roman and Byzantine Egypt for almost 1000 years until the Muslim conquest of Egypt in AD 641, when a new capital was founded at Fustat (later absorbed into Cairo). Hellenistic Alexandria was best known for the Lighthouse of Alexandria (Pharos), one of the Seven Wonders of the Ancient World; its Great Library (the largest in the ancient world; now replaced by a modern one); and the Necropolis, one of the Seven Wonders of the Middle Ages. Alexandria was the second most powerful city of the ancient world after Rome. Ongoing maritime archaeology in the harbor of Alexandria, which began in 1994, is revealing details of Alexandria both before the arrival of Alexander, when a city named Rhacotis existed there, and during the Ptolemaic dynasty.