In terms of relative length of units, a yoctometre ranks as follows: Planck length yoctometre zeptometre. A yoctometre is 1/1000 of a zeptometre (1 zeptometre (zm) = 1,000 yoctometres). The yoctometre,is the distance light travels in about:1Ã·2.99Ã10 35 seconds.
Engines of various sorts have been invented over the last two or three centuries. 1  In 1698, English military engineer, Thomas Savery, invented and patented the first crude steam engine, based on Denis Papin's Digester (pressure cooker) of 1679.
In 1698, English engineer, Thomas Savery patented the first crude steam engine. Savery used his invention to pump water out of a coal mine. In 1712, English engineer and blacksmith, Thomas Newcomen invented the atmospheric steam engine. The purpose of Newcomen's steam engine was also to remove water from mines. In 1765, Scottish engineer, James Watt began studying Thomas Newcomen's steam engine and invented an improved version. It was Watt's engine that was the first to have a rotary motion. James Watt's design was the one that succeeded and the use of steam engines became widespread.