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Polygonal masonry is a technique of stone wall construction. True polygonal masonry is a technique wherein the visible surfaces of the stones are dressed with straight sides or joints, giving the block the appearance of a polygon.
The Roman Polyspaston crane, from Ancient Greek πολύσπαστον (polúspaston, “compound pulley”), when worked by four men at both sides of the winch, could lift 3000 kg. In case the winch was replaced by a treadwheel, the maximum load even doubled to 6000 kg at only half the crew, since the treadwheel possesses a much bigger ...
Ancient Greek name English name Description Ἀχλύς (Akhlús) Achlys: The goddess of poisons, and the personification of misery and sadness. Said to have existed before Chaos itself. Αἰθήρ (Aithḗr) Aether: The god of light and the upper atmosphere. Αἰών (Aiōn) Aion: The god of eternity, personifying cyclical and unbounded time.
The introduction of steam engines for powering blast air to blast furnaces led to a large increase in British iron production after the mid-1750s. [ 19 ] : 123–25 In the late 1760s, the Coalbrookdale Company began to fix plates of cast iron to the upper surface of wooden rails, which increased their durability and load-bearing ability.
In 1735, such ores were found to be reducible to a new metal (the first discovered since ancient times), which was ultimately named for the kobold. Today, some cobalt is produced specifically from one of a number of metallic-lustered ores, such as cobaltite (CoAsS). The element is more usually produced as a by-product of copper and nickel mining.
The Great Pyramid of Giza [a] is the largest Egyptian pyramid.It served as the tomb of pharaoh Khufu, who ruled during the Fourth Dynasty of the Old Kingdom.Built c. 2600 BC, [3] over a period of about 26 years, [4] the pyramid is the oldest of the Seven Wonders of the Ancient World, and the only wonder that has remained largely intact.
The Škoda Octavia is a small family car produced by the Czech car manufacturer Škoda Auto since the end of 1996. It shares its name with an earlier model produced between 1959 and 1971.
Caracol is a large ancient Maya archaeological site, located in what is now the Cayo District of Belize.It is situated approximately 40 kilometres (25 mi) south of Xunantunich, and the town of San Ignacio, and 15 km (9.3 mi) from the Macal River.