Watts' steam engine in West End Park illustration taken from page 116 of "Industrial rivers of the United Kingdom" by various well-known experts, edited by Evan Rowland Jones, 1888. Improving on the design of the 1712 Newcomen engine, the Watt steam engine, developed sporadically from 1763-75, was the next great step in the development of the steam engine. Watt's two most important improvements were the separate condenser and rotary motion. The separate condenser condensed steam without cooling the piston and cylinder walls more than doubling Watt's engine's efficiency and otary motion was more suitable for industrial power. In 1785, Watt was made a Fellow of the Royal Society. He developed the concept of horsepower and the SI unit of power, the watt, was named after him. He died in 1819 at the age of 83. Watt has been described as one of the most influential figures in human history. Kelvingrove Park is a public park located on the River Kelvin in the West End of the city of Glasgow, Scotland. It was originally created as the West End Park in 1852 by noted English gardener Sir Joseph Paxton, Head Gardener at Chatsworth House, whose other works included The Crystal Palace in London.