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This engaged another gear with holes along the circumference, where pebbles (calculus) were located, that were to drop one by one into a box.The distance traveled would thus be given simply by counting the number of pebbles.The odometer was used also in subsequent periods of Chinese history.In the historical text of the Jin Shu (635 AD), the oldest part of the compiled text, the book known as the Cui Bao ( an instrument for measuring the distance travelled by a vehicle, such as a bicycle or car.The device may be electronic, mechanical, or a combination of the two.The odometer was also independently invented in ancient China, possibly by the prolific inventor and early scientist Zhang Heng (78 AD – 139 AD) of the Han Dynasty.

Since these minor discrepancies can be adequately explained by slight changes in the tracks of roads during the last 2300 years, the overall accuracy of the measurements implies that the bematists already must have used a sophisticated device for measuring distances, although there is no direct mention of such a device. Hero of Alexandria (10 AD - 70 AD) describes a similar device in chapter 34 of his Dioptra.At the completion of every li, the wooden figure of a man in the lower storey strikes a drum; at the completion of every ten li, the wooden figure in the upper storey strikes a bell.The carriage-pole ends in a phoenix-head, and the carriage is drawn by four horses.As recorded in the Song Shi of the Song Dynasty (960-1279 AD), the odometer and south-pointing chariot were combined into one wheeled device by engineers of the 9th century, 11th century, and 12th century.The Sunzi Suanjing (Master Sun's Mathematical Manual), dated from the 3rd century to 5th century, presented a mathematical problem for students involving the odometer.