THREE:A people so endowed were the natural creators of philo4sophy. There came a time when the harmonious universality of the Hellenic genius sought for its counterpart and completion in a theory of the external world. And there came a time, also, when the decay of political interests left a large fund of intellectual energy, accustomed to work under certain conditions, with the desire to realise those conditions in an ideal sphere. Such is the most general significance we can attach to that memorable series of speculations on the nature of things which, beginning in Ionia, was carried by the Greek colonists to Italy and Sicily, whence, after receiving important additions and modifications, the stream of thought flowed back into the old country, where it was directed into an entirely new channel by the practical genius of Athens. Thales and his successors down to Democritus were not exactly what we should call philosophers, in any sense of the word that would include a Locke or a Hume, and exclude a Boyle or a Black; for their speculations never went beyond the confines of the material universe; they did not even suspect the existence of those ethical and dialectical problems which long constituted the sole object of philosophical discussion, and have continued since the time when they were first mooted to be regarded as its most peculiar province. Nor yet can we look on them altogether or chiefly as men of science, for their paramount purpose was to gather up the whole of knowledge under a single principle; and they sought to realise this purpose, not by observation and experiment, but by the power of thought alone. It would, perhaps, be truest to say that from their point of view philosophy and science were still undifferentiated, and that knowledge as a universal synthesis was not yet divorced from special investigations into particular orders of phenomena. Here, as elsewhere, advancing reason tends to reunite studies which have been provisionally separated, and we must look to our own contemporaries��to our Tyndalls and Thomsons, our Helmholtzes and Z?llners��as furnishing the fittest parallel to5 Anaximander and Empedocles, Leucippus and Diogenes of Apollonia."All right, darling," Hetty whispered. "Lie down and be quiet, and I will see what I can do for you. I shan't be long."

THREE:The sudden and varied resistance to line shafts tends to loosen couplings, destroy gearing, and produce sudden strains that are unknown in other cases; and shafting arranged with the usual proportions for transmitting power will soon fail if applied to driving trip-hammers. Rigid connections or metal attachments ace impracticable, and a slipping belt arranged so as to have the tension varied at will is the usual and almost the only successful means of transmitting power to hammers. The motion of trip-hammers is a curious problem; a head and die weighing, together with the irons for attaching them, one hundred pounds, will, with a helve eight feet long, strike from two to three hundred blows a minute. This speed exceeds anything that could be attained by a direct reciprocal motion given to the hammer-head by a crank, and far exceeds any rate of speed that would be assumed from theoretical inference. The hammer-helve being of wood, is elastic, and acts like a vibrating spring, its vibrations keeping in unison with the speed of the tripping points. The whole machine, in fact, must be constructed upon a principle of elasticity throughout, and in this regard stands as an exception to almost every other known machine. The framing for supporting the trunnions, which one without experience would suppose should be very rigid and solid, is found to answer best when composed of timber, and still better when this timber is laid up in a manner that allows the structure to spring and [107] yield. Starting at the dies, and following back through the details of a trip-hammer to the driving power, the apprentice may note how many parts contribute to this principle of elasticity: First��the wooden helve, both in front of and behind the trunnion; next��the trunnion bar, which is usually a flat section mounted on pivot points; third��the elasticity of the framing called the 'husk,' and finally the frictional belt. This will convey an idea of the elasticity required in connecting the hammer-head with the driving power, a matter to be borne in mind, as it will be again referred to.

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