Please forward this error screen to 85. Dates for inventions are often controversial. Inventions are often invented by several inventors around the same time, or may be invented in an impractical practical electronics for inventors fourth edition pdf many years before another inventor improves the invention into a more practical form.
Where there is ambiguity, the date of the first known working version of the invention is used here. Dates are often approximate and change as more research is done, reported, and seen. Older examples of any given technology are found often. The locations listed are for the site where the earliest solid evidence has been found, but especially for the earlier inventions there is little certainty how close that may be to where the invention took place. A few non-invention links are included in italics, for context.
8000 BC is approximately the same as 10 ka. Mediterranean by the 6th century AD. An illustration depicting the papermaking process in Han Dynasty China. The first dependable representation of a rider with paired stirrups was found in China in a Jin dynasty tomb of about AD 322. The stirrup appeared to be in widespread use across China by AD 477. The horse collar as a fully developed collar harness is developed in Southern and Northern Dynasties China during the 5th century AD.
India, between 500 and 1000 A. Kallinikos merely introduced an improved version of an established weapon. True porcelain is manufactured in northern China from roughly the beginning of the Tang Dynasty in the 7th century, while true porcelain was not manufactured in southern China until about 300 years later, during the early 10th century. The concept of zero as a number, and not merely a symbol for separation is attributed to India. In India, practical calculations are carried out using zero, which is treated like any other number by the 9th century, even in case of division. In the 13th century, Koreans invent metal-type movable printing.
The typical Chinese navigational compass was in the form of a magnetic needle floating in a bowl of water. 47 years later that his father invented it. Safety lamps based on Clanny’s improved design were used until the adoption of electric lamps. The lathe can copy symmetrical shapes and is used for making gun stocks, and later, ax handles.