FORE:Nor was this all. Before philosophising, the Greeks did not think only in the order of time; they learned at a very early period to think also in the order of space, their favourite idea of a limit being made especially prominent here. Homers geographical notions, however erroneous, are, for his age, singularly well defined. Aeschylus has a wide knowledge of the earths surface, and exhibits it with perhaps unnecessary readiness. Pindar delights to follow his mythological heroes about on their travels. The same tendency found still freer scope when prose literature began. Hecataeus, one of the earliest prose-writers, was great both as a genealogist and as a geographer; and in this respect also Herodotus carried out on a great scale the enquiries most habitually pursued by his countrymen. Now, it will be remembered that we have had occasion to characterise early Ionian speculation as being, to a great extent, cosmography. The element from which it deduced all things was, in fact, that which was supposed to lie outside and embrace the rest. The geographical limit was conceived as a genealogical ancestor. Thus, the studies which men like Hecataeus carried on separately, were combined, or rather confused, in a single bold generalisation by Anaximenes and Heracleitus.(1.) What analogy may be found between steam and water power?(2.) What is the derivation of the name turbine?(3.) To what class of water-wheels is this name applicable?(4.) How may water-wheels be classified?(5.) Upon what principle does a reaction water-wheel operate?(6.) Can ponderable weight and pressure be independently considered in the case?(7.) Why cannot radial running joints be maintained in machines?(8.) Describe the mechanism in common use for sustaining the weight of turbine wheels, and the thrust of propeller shafts.
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