Modern industry is stated by some writers to have begun in 1738 when brought out a . Others place the period as between 1750 and 1800, when the and steam engine came into being. It was marked by the development of labor-saving machinery. It was brought about by the change from handicraft to manufacture.
The industrial revolution was well underway before the steam-engine came into use for driving machinery. Only two prime-movers—the water wheel and the windmill—were widely available, and with very few exceptions these yielded no more than 10 h.p. and often less.
Turning a small surface of water into vapour by fire, applied to the bottom of the cylinder that contains it; which vapour forces up the plug (or piston) in the cylinder to a considerable height, and which, as the vapour condenses, (as the water cools when taken from the fire,) descends again by air's pressure, and is applied to raise water out of the mine.
What I say here is not to give room for believing, that Mr. Savery, who has since published this invention at London, is not actually the inventor. I do not doubt that the same thought may have occurred to him, as well as to others, without having learnt it elsewhere.
I only just hint this to show what use this engine may be put to in working of mills, especially where coals are cheap. I have only this to urge, that water in its fall from any determinate height, has simply a force answerable and equal to the force that raises it.
When once the idea of the separate condensation was started, all these improvements followed as corollaries in quick succession, so that in the course of one or two days the invention was thus far complete in my mind, and I immediately set about an experiment to verify it practically.