The Terracotta Army - 1974

The Terracotta Army or the "Terracotta Warriors and Horses" is a collection of terracotta sculptures depicting the armies of Qin Shi Huang, the first Emperor of China. It is a form of funerary art buried with the emperor in 210–209 BCE and whose purpose was to protect the emperor in his afterlife.

The figures, dating from approximately the late third century BCE, were discovered in 1974 by local farmers in Lintong District,Xi'an, Shaanxi province. The figures vary in height according to their roles, with the tallest being the generals. The figures include warriors, chariots and horses. Estimates from 2007 were that the three pits containing the Terracotta Army held more than 8,000 soldiers, 130 chariots with 520 horses and 150 cavalry horses, the majority of which remained buried in the pits nearby Qin Shi Huang's mausoleum.^[2] Other terracotta non-military figures were found in other pits, including officials, acrobats, strongmen and musicians.

The Terracotta Army was discovered on 29 March 1974 to the east of Xi'an in Shaanxi province by farmers digging a water well approximately 1.6 kilometres (0.99 mi) east of the Qin Emperor's tomb mound at Mount Li (Lishan), a region riddled with underground springs and watercourses. For centuries, occasional reports mentioned pieces of terracotta figures and fragments of the Qin necropolis – roofing tiles, bricks and chunks of masonry.^[6] This discovery prompted Chinese archaeologists to investigate, revealing the largest pottery figurine group ever found in China

In 2007, scientists at Stanford University and the Advanced Light Source facility in Berkeley, California reported that powder diffraction experiments combined with energy-dispersive X-ray spectroscopy and micro-X-ray fluorescence analysis showed that the process of producing Terracotta figures colored with Chinese purple dye consisting ofbarium copper silicate was derived from the knowledge gained by Taoist alchemists in their attempts to synthesize jade ornaments.

Since 2006, an international team of researchers at the UCL Institute of Archaeology have been using analytical chemistry techniques to uncover more details about the production techniques employed in the creation of the Terracotta Army. Using X-ray fluorescence spectrometry of 40,000 bronze arrowheads bundled in groups of 100, the researchers reported that the arrowheads within a single bundle formed a relatively tight cluster that was different from other bundles. In addition, the presence or absence of metal impurities was consistent within bundles. Based on the arrows’ chemical compositions, the researchers concluded that a cellular manufacturing system similar to the one used in a modern Toyota factory, as opposed to a continuous assembly line in the early days of automobile industry, was employed.

Grinding and polishing marks visible under a scanning electron microscope provide evidence for the earliest industrial use of lathes for polishing.
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