THREE:Isometrical perspective is often useful in drawing, especially in wood structures, when the material is of rectangular section, and disposed at right angles, as in machine frames. One isometrical view, which can be made nearly as quickly as a true elevation, will show all the parts, and may be figured for dimensions the same as plane views. True perspective, although rarely necessary in mechanical drawing, may be studied with advantage in connection with geometry; it will often lead to the explanation of problems in isometric drawing, and will also assist in free-hand lines that have sometimes to be made to show parts of machinery oblique to the regular planes. Thus far the remarks on draughting have been confined to manipulation mainly. As a branch of engineering work, draughting must depend mainly on special knowledge, and is not capable of being learned or practised upon general principles or rules. It is therefore impossible to give a learner much aid by searching after principles to guide him; the few propositions that follow comprehend nearly all that may be explained in words.It was by that somewhat slow and circuitous process, the negation of a negation, that spiritualism was finally established. The shadows of doubt gathered still more thickly around futurity before another attempt could be made to remove them. For the scepticism of the Humanists and the ethical dialectic of Socrates, if they tended to weaken the dogmatic materialism of physical philosophy, were at first238 not more favourable to the new faith which that philosophy had suddenly eclipsed. For the one rejected every kind of supernaturalism; and the other did not attempt to go behind what had been directly revealed by the gods, or was discoverable from an examination of their handiwork. Nevertheless, the new enquiries, with their exclusively subjective direction, paved the way for a return to the religious development previously in progress. By leading men to think of mind as, above all, a principle of knowledge and deliberate action, they altogether freed it from those material associations which brought it under the laws of external Nature, where every finite existence was destined, sooner or later, to be reabsorbed and to disappear. The position was completely reversed when Nature was, as it were, brought up before the bar of Mind to have her constitution determined or her very existence denied by that supreme tribunal. If the subjective idealism of Protagoras and Gorgias made for spiritualism, so also did the teleological religion of Socrates. It was impossible to assert the priority and superiority of mind to matter more strongly than by teaching that a designing intelligence had created the whole visible universe for the exclusive enjoyment of man. The infinite without was in its turn absorbed by the infinite within. Finally, the logical method of Socrates contained in itself the germs of a still subtler spiritualism which Plato now proceeded to work out.
FORE:
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TWO:We now turn to Sir A. Grant, who, as was mentioned at371 the beginning of the last chapter, makes Aristotle a supporter of the late Prof. Ferrier. We will state the learned Principals view in his own words:
TWO:There was the best part of a mile to go; it was getting very late, but Hetty had not been out all day, so that she enjoyed the walk. She made her way back along the darkness of Alton Square. Most of the houses were dark, and nobody was to be seen."Where is De Tijd printed?"
TWO:Handling and moving material is the principal matter to be considered in the arrangement of engineering works. The constructive manipulation can be watched, estimated, and faults detected by comparison, but handling, like the designs for machinery, is a more obscure matter, and may be greatly at fault without its defects being apparent to any but those who are highly skilled, and have had their attention especially directed [73] to the matter.
