× FORE:

× FORE:Following this subject of future improvement farther, it may be assumed that an engineer who understands the application and operation of some special machine, the principles that govern its movements, the endurance of the wearing surfaces, the direction and measure of the strains, and who also understands the principles of the distribution of material, arrangement, and proportions,��that such an engineer will be able to construct machines, the plans of which will not be materially departed from so long as the nature of the operations to which [10] the machines are applied remain the same.

× FORE:103

× FORE:Attention has been called to this case as one wherein the conditions of operation obviously furnish true data to govern the arrangement of machinery, instead of the determinable strains to which the parts are subjected, and as a good example of the importance of studying mechanical conditions from a practical and experimental point of view. If the general diameter of a shaft is based upon the exact amount of power to be transmitted, or if the diameter of a shaft at various parts is based upon the torsional stress that would be sustained at these points, such a shaft would not only fail to meet the conditions of practical use, but would cost more by attempting such an adaptation. The regular working strain to which shafts are subjected is inversely as the speed at which they run. This becomes a strong reason in favour of arranging shafts to run at a maximum speed, provided there was nothing more than first cost to consider; but there are other and more important conditions to be taken into account, principal among which are the required rate of movement where power is taken off to machines, and the endurance of bearings.

× FORE:To attain a double effect, and avoid the loss pointed out, Mr Ramsbottom designed what may be called compound hammers, consisting of two independent heads or rams moving in opposite directions, and acting simultaneously upon pieces held between them.

× FORE:"It is as I tell you!"This change in engineering pursuits has also produced a change in the workmen almost as thorough as in manipulation. A man who deals with special knowledge only and feels that the secrets of his calling are not governed by systematic rules, by which others may qualify themselves without his assistance, is always more or less narrow-minded and ignorant. The nature of his relations to others makes him so; of this no better proof is wanted than to contrast the intelligence of workmen who are engaged in what may be termed exclusive callings with people whose pursuits are regulated by general rules and principles. A machinist of modern times, having outgrown this exclusive idea, has been raised thereby to a social position confessedly superior to that of most other mechanics, so that shop association once so dreaded by those who would otherwise have become mechanics, is no longer an obstacle.

× FORE:He swung his head, signaled Dick, waved an arm, pointing. Dick and Larry stared, while Sandy poked Jeff and repeated his gestures."You are forgetting yourself," the Countess said coldly. "Leave the room."

× FORE:The truths here touched on seem to have been dimly present to the mind of Plato. He never doubts that all knowledge must, in some way or other, be derived from experience; and, accordingly, he assumes that what cannot have been learned in this world was learned in another. But he does not (in the Meno at least) suppose that the process ever had a beginning. It would seem that he is trying to express in figurative language the distinction, lost almost as soon as found, between intelligence and the facts on which intelligence is exercised, An examination of the steps by which Meno��s slave is brought to perceive, without being directly told, the truth of the Pythagorean theorem, will show that his share in the demonstration is limited to the intuition of certain numerical equalities and inequalities. Now, to Plato, the perception of sameness and difference meant everything. He would have denied that the sensible world presented examples of these relations in their ideal absoluteness and purity. In tracing back their apprehension to the self-reflection of the soul, the consciousness of personal identity, he would not have transgressed the limits of a legitimate enquiry. But self-consciousness involved a possible abstraction from disturbing influences, which he interpreted as a real separation between mind and matter; and, to make it more complete, an inde213pendent pre-existence of the former. Nor was this all. Since knowledge is of likeness in difference, then the central truth of things, the reality underlying all appearance, must be an abiding identity recognised by the soul through her previous communion with it in a purer world. The inevitable tendency of two identities, one subjective and the other objective, was to coalesce in an absolute unity where all distinctions of time and space would have disappeared, carrying the whole mythical machinery along with them; and Plato��s logic is always hovering on the verge of such a consummation without being able fully to accept it. Still, the mystical tendency, which it was reserved for Plotinus to carry out in its entirety, is always present, though restrained by other motives, working for the ascertainment of uniformity in theory and for the enforcement of uniformity in practice.Hetty's patience was rewarded at last. She could hear the faint murmur of the motor in the street; there was a sudden gush of air as the front door opened, and the voice of the Countess in her most honeyed tones as she ushered somebody into the dining-room. Instantly the girl crept downstairs and hid herself behind the porti��re over the door. It was an audacious thing to do, but her audacity paid, as it generally does.

× FORE:In the preceding chapter we traced the rise and progress of physical philosophy among the ancient Greeks. We showed how a few great thinkers, borne on by an unparalleled development of intellectual activity, worked out ideas respecting the order of nature and the constitution of matter which, after more than two thousand years, still remain as fresh and fruitful as ever; and we found that, in achieving these results, Greek thought was itself determined by ascertainable laws. Whether controlling artistic imagination or penetrating to the objective truth of things, it remained always essentially homogeneous, and worked under the same forms of circumscription, analysis, and opposition. It began with external nature, and with a far distant past; nor could it begin otherwise, for only so could the subjects of its later meditations be reached. Only after less sacred beliefs have been shaken can ethical dogmas be questioned. Only when discrepancies of opinion obtrude themselves on man��s notice is the need of an organising logic experienced. And the mind��s eye, originally focussed for distant objects alone, has to be gradually restricted in its range by the pressure of accumulated experience before it can turn from past to present, from successive to contemporaneous phenomena. We have now to undertake the not less interesting task of showing how the new culture, the new conceptions, the new power to think obtained through those earliest54 speculations, reacted on the life from which they sprang, transforming the moral, religious, and political creeds of Hellas, and preparing, as nothing else could prepare, the vaster revolution which has given a new dignity to existence, and substituted, in however imperfect a form, for the adoration of animalisms which lie below man, the adoration of an ideal which rises above him, but only personifies the best elements of his own nature, and therefore is possible for a perfected humanity to realise.��Or in New York!�� corrected Sandy meaningly.