ONE:After its temporary adoption by the Academy, Pythagoreanism had ceased to exist as an independent system, but continued to lead a sort of underground life in connexion with the Orphic and Dionysiac mysteries. When or where it reappeared under a philosophical form cannot be certainly determined. Zeller fixes on the beginning of the first century B.C. as the most probable date, and on Alexandria as the most probable scene of its renewed speculative activity.385 Some fifty years later, we find Pythagorean teachers in Rome, and traces of their influence are plainly discernible in the Augustan literature. Under its earliest form, the new system was an attempt to combine mathematical mysticism with principles borrowed from the Stoic and other philosophies; or perhaps it was simply a return to the poetical syncretism of Empedocles. Although composed of fire and air, the soul is declared to be immortal; and lessons of holiness are accompanied by an elaborate code of rules for ceremonial purification. The elder Sextius, from whom Seneca derived much of his ethical enthusiasm, probably belonged to this school. He taught a morality apparently identical with that of Stoicism in every point except the inculcation of abstinence from animal food.386 To this might be added the practice of nightly self-confessionan examination from the moral point of view of how ones whole day has been spent,were we certain that the Stoics did not originate it for themselves.387
TWO:In respect to lathe manipulation, which is perhaps the most difficult to learn of all shop operations, the following hints are given, which may prove of service to a learner: At the beginning the form of tools should be carefully studied; this is one of the great points in lathe work; the greatest distinction between a thorough and indifferent latheman is that one knows the proper form and temper of tools and the other does not. The adjustment and presenting of tools is soon learned by experience, but the proper form of tools is a matter of greater difficulty. One of the first things to study is the shape of cutting edges, both as to clearance below the edge of the tool, and the angle of the edge, with reference to both turning and boring, because the latter is different from turning. The angle of lathe tools is clearly suggested by diagrams, and there is no better first lesson in drawing than to construct diagrams of cutting angles for plane and cylindrical surfaces.A remarkable circumstance connected with the evidence afforded by the figured monuments is its progressive cha239racter. According to M. Ravaisson, As time goes on, the indications of belief in a future life, instead of becoming fainter, grow clearer and more distinct. More and more exalted ideas are formed of the souls destiny, and ever increasing honours are paid to the dead. Moreover, these ideas and practices are extended so as to cover a greater number of individuals. At first it would seem that the only persons whose fate excites any interest are kings and heroes, the children or the descendants of the gods; in the course of time many others, and at last all, or nearly all, are admitted to a share in the same regard. The ancient principle that happiness is reserved for those who resemble the gods remains unchanged; but the notion of what constitutes resemblance to the gods, or in other words perfection, gradually becomes so modified, that all men may aspire to reach it.370
ONE:First I will notice that among our many books upon mechanical subjects there are none that seem to be directed to the instruction of apprentice engineers; at least, there are none directed to that part of a mechanical education most difficult to acquire, a power of analysing and deducing conclusions from commonplace matters.Cynicism, if we understand it rightly, was only the mutilated form of an older philosophy having for its object to set morality free from convention, and to found it anew on a scientific knowledge of natural law. The need of such a system was not felt so long as Plato and Aristotle were unfolding their wonderful schemes for a reorganisation of action and belief. With the temporary collapse of those schemes it came once more to the front. The result was a new school which so thoroughly satisfied the demands of the age, that for five centuries the noblest spirits of Greece and Rome, with few exceptions, adhered to its doctrines; that in dying it bequeathed some of their most vital elements to the metaphysics and the theology by which it was succeeded; that with their decay it reappeared as an important factor in modern thought; and that its name has become imperishably associated in our own language with the proud endurance of suffering, the self-sufficingness of conscious rectitude, and the renunciation of all sympathy, except what may be derived from contemplation of the immortal dead, whose heroism is7 recorded in history, or of the eternal cosmic forces performing their glorious offices with unimpassioned energy and imperturbable repose.
TWO:
ONE:Leaving out problems of mechanism in forging machines, the adaptation of pressing or percussive processes is governed mainly by the size and consequent inertia of the pieces acted upon. In order to produce a proper effect, that is, to start the particles of a piece throughout its whole depth at each blow, a certain proportion between a hammer and the piece acted upon must be maintained. For heavy forging, this principle has led to the construction of enormous hammers for the performance of such work as no pressing machinery can be made strong enough to execute, although the action of such machinery in other respects would best suit the conditions of the work. The greater share of forging processes may be performed by either blows or compression, and no doubt the latter process is the best in most cases. Yet, as before explained, machinery to act by pressure is much more complicated and expensive than hammers and drops. The tendency in practice is, however, to a more extensive employment of press-forging processes.
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