It is believed that the first mechanical clock was invented in 723 or 725 A.D. by Chinese mathematician and monk Yi Xing, also spelled I Hsing. Rudimentary clocks existed prior to that in Europe, but they did not have th... More »

The first mechanical clock invented was in China during the 8th century A.D. The first mechanical clocks in Europe began to appear in the early 14th century. More »

www.reference.com History Inventions

While devices to measure time have existed for thousands of years, the first mechanical clock was created in 725 by Yi Xing and Liang Lingzan in China. This was the first clock to use an escapement mechanism rather than ... More »

The first mechanical clock invented was in China during the 8th century A.D. The first mechanical clocks in Europe began to appear in the early 14th century. More »

www.reference.com History Inventions

While devices to measure time have existed for thousands of years, the first mechanical clock was created in 725 by Yi Xing and Liang Lingzan in China. This was the first clock to use an escapement mechanism rather than ... More »

Excluding the abacus or slide rule, the first mechanical calculator was invented by French inventor, Blaise Pascal in 1642. It could add or subtract two numbers or divide and multiply by repetition, using geared wheels. More »

The international unit of the second was first described by the Greco-Egyptian mathematician Claudius Ptolemy in his work "Almagest" around 150 C.E. He defined the second, or second-minute, as one-sixtieth of a minute. More »