TWO:Engines operated by means of hot air, called caloric engines, and engines operated by gas, or explosive substances, all act substantially upon the same general principles as steam-engines; the greatest distinction being between those engines wherein the generation of heat is by the combustion of fuel, and those wherein heat and expansion are produced by chemical action. With the exception of a limited number of caloric or air engines, steam machinery comprises nearly all expansive engines that are employed at this day for motive-power; and it may be safely assumed that a person who has mastered the general principles of steam-engines will find no trouble in analysing and understanding any machinery acting from expansion due to heat, whether air, gas, or explosive agents be employed.The characters in Homer are marked by this incredulous disposition in direct proportion to their general wisdom. When Agamemnon relates his dream to the assembled chiefs, Nestor dryly observes that if anyone of less authority had told them such a story they would have immediately rejected it as untrue. Hectors outspoken contempt for augury is well known; and his indifference to the dying words of Patroclus is equally characteristic. In the Odyssey, Alcinous pointedly distinguishes his guest from the common run of travellers, whose words deserve no credit. That Telemachus should tell who is his father, with the uncomplimentary reservation that he has only his mothers word for it, is128 evidently meant as a proof of the young mans precocious shrewdness; and it is with the utmost difficulty that Penelope herself is persuaded of her husbands identity. So in the Agamemnon of Aeschylus, nothing less than the report of an eye-witness will convince the Chorus of old men that Troy has really fallen.218 Finally, to complete the list of examples afforded independently of philosophical reflection, Herodotus repeatedly expresses disbelief in the stories told him, or, what is more remarkable, holds his judgment in suspense with regard to their veracity.
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