THREE:The most perfect castings for gear wheels and pulleys and other pieces which can be so moulded, are made by drawing the patterns through templates without rapping. These templates are simply plates of metal perforated so that the pattern can be forced through them by screws or levers, leaving the sand intact. Such templates are expensive to begin with, because of the accurate fitting that is required, especially around the teeth of wheels, and the mechanism that is required in drawing the patterns, but when a large number of pieces are to be made from one pattern, such as gear wheels and pulleys, the saving of labour will soon pay for the templates and machinery required, to say nothing of the saving of metal, which often amounts to ten per cent., and the increased value of the castings because of their accuracy.
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THREE:CHAPTER IIIIt remains to glance at another aspect of the dialectic method first developed on a great scale by Plato, and first fully defined by Aristotle, but already playing a certain part in the Socratic teaching. This is the testing of common assumptions by pushing them to their logical conclusion, and rejecting those which lead to consequences inconsistent with themselves. So understood, dialectic means the complete elimination of inconsistency, and has ever since remained the most powerful weapon of philosophical criticism. To take an instance near at hand, it is constantly employed by thinkers so radically different as Mr. Herbert Spencer and Professor T. H. Green; while it has been generalised into an objective law of Nature and history, with dazzling though only momentary success, by Hegel and his school.
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THREE:"You used to lock it up in the yard here. We find a fresh cake of blacklead in the scullery, which completely puzzled me for a little time. When I heard about the autocar I knew. But we are getting away from the point. When luck turned against you it did so completely. You got into Isidore's rooms, only to find Mr. Charlton there, who was waiting for him. Again fortune favoured us. Mr. Charlton gave the alarm, and you had to fly. At length the motor was abandoned, and its secret disclosed. You disappeared. Sooner or later I was certain of seeing you again."It is not, then, surprising that the Academic and Peripatetic schools utterly failed to carry on the great movement inaugurated by their respective founders. The successors of Plato first lost themselves in a labyrinth of Pythagorean mysticism, and then sank into the position of mere moral instructors. The history of that remarkable revolution by which the Academy regained a foremost place in Greek thought, will form the subject of a future chapter: here we may anticipate so far as to observe that it was effected by taking up and presenting in its original purity a tradition of older date than Platonism, though presented under a new aspect and mixed with other elements by Plato. The heirs of Aristotle, after staggering on a few paces under the immense burden of his encyclopaedic bequest, came to a dead halt, and contented themselves with keeping the treasure safe until the time should arrive for its appropriation and reinvestment by a stronger speculative race.
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THREE:Machine-drawing may in some respects be said to bear the same relation to mechanics that writing does to literature; persons may copy manuscript, or write from dictation, of what they do not understand; or a mechanical draughtsman may make drawings of a machine he does not understand; but neither such writing or drawing can have any value beyond that of ordinary labour. It is both necessary and expected that a draughtsman shall understand all the various processes of machine construction, and be familiar with the best examples that are furnished by modern practice.Fourth. The arrangement of the parts of a combination machine have to be modified by the relations between them, instead of being adapted directly to the work to be performed.
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