STEAM-ENGINE

The. power of steam was known to the ancients, a mechanical contrivance in which it was used being noted by Hero of Alexandria about 130 B.C., but nothing came of it; and it was not till the —Giovanni 17th century that its power was again recognized Cans (1G15), Giovanni 1 Branca (162c?), and the Marquis of Worcester (1663). The principle of their inven-