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100 AD) stated in chapter 52: "This instrument resembles a spoon and when it is placed on a plate on the ground, the handle points to the south".The Chinese polymath Shen Kuo (1031–1095) of the Song Dynasty (960–1279) was the first to accurately describe both magnetic declination (in discerning true north) and the magnetic needle compass in his Dream Pool Essays of 1088, while the Song dynasty writer Zhu Yu (fl.Although it is recorded that the Han Dynasty (202 BC – AD 220) court eunuch Cai Lun (50 AD – AD 121) invented the pulp papermaking process and established the use of new materials used in making paper, ancient padding and wrapping paper artifacts dating to the 2nd century BC have been found in China, the oldest example of pulp papermaking being a map from Fangmatan, Tianshui; by the 3rd century, paper as a writing medium was in widespread use, replacing traditional but more expensive writing mediums such as strips of bamboo rolled into threaded scrolls, strips of silk, wet clay tablets hardened later in a furnace, and wooden tablets.The earliest known piece of paper with writing on it was discovered in the ruins of a Chinese watchtower at Tsakhortei, Alxa League, where Han Dynasty troops had deserted their position in AD 110 following a Xiongnu attack.

Example of a Chinese printed map in a gazetteer, showing Fengshan County of Taiwan Prefecture, published in 1696; the first known printed map from China comes from a Song Dynasty (960–1279) encyclopedia of the 12th century A cross section of a Chinese hall, from the Yingzao Fashi architectural treatise published by Li Jie in 1103, during the Song Dynasty (960–1279); this book explicitly laid out an eight-graded modular system of architecture for timber halls and pavilions of different sizes A plan and side view of a canal pound lock, essentially a double-gate canal lock used to regulate water levels in segmented canal chambers for the safe passage of ships, first invented by the 10th century engineer Qiao Weiyo for a section of China's Grand Canal The puddling process of smelting iron ore to make wrought iron from pig iron, the right half of the illustration (not shown) displays men working a blast furnace, Tiangong Kaiwu encyclopedia published in 1637, written by Song Yingxing (1587–1666).Although an ancient hematite artifact from the Olmec era in Mexico dating to roughly 1000 BC indicates the possible use of the lodestone compass long before it was described in China, the Olmecs did not have iron which the Chinese would discover could be magnetised by contact with lodestone.The Lunheng, written by Han dynasty writer, scientist, and philosopher Wang Chong (27 – c.With the navigational aid of the 11th century compass and ability to steer at high sea with the 1st century sternpost rudder, premodern Chinese sailors sailed as far as East Africa.In water-powered clockworks, the premodern Chinese had used the escapement mechanism since the 8th century and the endless power-transmitting chain drive in the 11th century.

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