W. Cecil
Extract from Internal Combustion Engines by Wallace L. Lind. Published 1920 Boston.
In 1820 the Reverend W. Cecil of Cambridge, England, described an engine which was moved by pressure of the atmosphere upon a vacuum caused by the explosion of hydrogen gas mixed with air. In his paper he described an engine which he had constructed to operate according to the explosion-vacuum method. He stated that at sixty revolutions per minute the explosions took place with perfect regularity. This paper gives an account of the first gas engine which appears to have been worked in England, and, it is believed, in the world.