A fairly detailed description and drawing of the gastraphetes appears in Heron's Belopoeica (Ancient Greek Βελοποιικ?, English translation: On arrow-making), drawn from the account by the 3r ...
Terminus post quem ("limit after which", short for terminus post quem non licet, "limit after which one may not go", often abbreviated to TPQ) and terminus ante quem ("limit before which") specify the ...
Hubei is divided into thirteen prefecture-level divisions (of which there are twelve prefecture-level cities and one autonomous prefecture), as well as three directly administered county-level cities ...
By the Spring and Autumn Period (770 BC - 476 BC), the territory of today's Hubei was part of the powerful State of Chu. Chu was nominally a tributary state of the Zhou dynasty, and it was itself an e ...
The earliest reasonably reliable date for the crossbow in the Greek world is from the 5th century BC. The historian Diodorus Siculus (fl. 1st century BC), described the invention of a mechanical arrow ...
Crossbows exist in different variants. One way to classify them is the acceleration system, while another is the size and energy, degree of automation or projectiles.A recurve crossbow is a bow that h ...
The province of Jiangsu originated in the seventeenth century with the splitting of the defunct and erroneously named Jiangnan Province ("south of the river") into Jiangsu and Anhui. Before then, the ...
The politics of Jiangsu is structured in a one party (Communist) government system like all other governing institutions in mainland China.The Governor of Jiangsu is the highest-ranking official in th ...
During the earliest Chinese dynasties, the area in what is now Jiangsu was far removed from the center of Chinese civilization, which was in the northwest Henan; it was home of the Huai Yi (淮夷), an ...
The Xia dynasty of China (from c. 2100 to c. 1600 BC) is the first dynasty to be described in ancient historical records such as Sima Qian's Records of the Grand Historian and Bamboo Annals.Although t ...
Cast iron columns enabled architects to build tall buildings without the enormously thick walls required to construct masonry buildings of any height. Such flexibility allowed tall buildings to have l ...
Cast iron is made by re-melting pig iron, often along with substantial quantities of scrap iron, scrap steel, lime stone, carbon (coke) and taking various steps to remove undesirable contaminants. Pho ...
Main article: List of metropolitan areas in SpainGeographical distribution of the Spanish population in 2008Source: "?reas urbanas +50", Ministry of Public Works and Transport (2013)e ? d Rank Metro ...
Spain is one of the world's leading countries in the development and production of renewable energy. In 2010 Spain became the solar power world leader when it overtook the United States with a massive ...
Main articles: Mid-19th-century Spain, Spanish American wars of independence and Spanish–American WarThe Third of May 1808 by Francisco de Goya, episode of the Spanish Independence War.In 1793, Spain ...
