Aëro-steam Engine

One which uses a mixture of air and steam in the cylinder to drive the piston. The air is pumped into the steam chest at the same pre ure as the steam received from the boiler. Air acts to retard condensation of steam when intimately mixed with it; but experiments, where no complicated apparatus was used to secure such mixture, showed that a good engine used the same amount of feed water per horse power per hour, whether using the air mixture or steam without air. IMG:content-0051.jpg:[blocks in formation] Æschines, 389-314 B.C. A then i an orator. He attained high office by military succe es, was won over by Philip, and became chief of the Maced on i an party at Athens. Was opposed by Demosthenes, but held his ground, and, as emba ador to Philip and to the Amphictyonic Council, opposed the national party. Accused of having received bribes and a isting the enemies of Athens, his influence declined. The battle of Chæroneia in 338 B.C. decided the fate of Greece. Ctesiphon proposed that a crown of gold be given Demosthenes. The form of the proposition being illegal, A. brought an action against him, and Demosthenes defended him in his famous Oration on the Crown. The latter won, and A. went into banishment. He founded a school of eloquence at Rhodes. Æschylus, 525-456 B.C. First great A then i an tragic poet. He fought bravely at Marathon, Artemisium, Salamis and Platæa, improved the stage, and was recognized as chief in tragedy 484-468, when he was defeated in a tragic contest by Sophocles. He then left Athens and went to Syracuse, to the court of King Hiero. Ten years later he seems to have been again in Athens, but afterward returned to Sicily, where he is said to have been killed by a stone let fall by an eagle. His style was bold, majestic, full of energy and rich in imagery. He sought to teach high moral truth. Plays extant: Persians, Seven against Thebes , Suppliants , Pro me the us , Agamemnon , Cho ephori , Eu menides . IMG:content-0052.png:[blocks in formation] Æsop. Greek fabulist, ab. 570 B.C.; said to have been a deformed slave, who gained his freedom, traveled, and conveyed instruction in the form of fables. Those attributed to him were long handed down by oral tradition.