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If we will return a moment to the little steam engine of the ancient Hero of Alexandria, called the Eolipile, it will be remembered that the steam admitted into a pivoted vessel and out of it through little opposite pipes, having bent exits turned in contrary directions, caused the vessel to rotate by reason of the reaction of the steam against the pipes.

The amiable John Evelyn, in his ‘Diary,’ mentions his visiting Mr. Boyle at Chelsea, on the 9th March, 1661, in company “with that excellent person and philosopher, Sir Robert Murray,” where they “saw divers effects of the eolipile for weighing air.”

The many-times written history of the application of steam, from the time of the eolipile of Hero of Alexandria to the heroic period of Newcomen and Watt, and the improvements made since their time, is one proof of the statement.

This also was the invention of Hero, and was a reaction engine, on the principle of the eolipile.