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THREE:Tangent wheels and spiral gearing have only what is termed line contact between the bearing surfaces, and as the action between these surfaces is a sliding one, such wheels are subject to rapid wear, and are incapable of sustaining much pressure, or transmitting a great amount of power, except the surfaces be hard and lubrication constant. In machinery the use of tangent wheels is mainly to secure a rapid change of speed, usually to diminish motion and increase force.On the other hand, this substitution of the social for the personal integer involves a corresponding change in the398 valuation of individual happiness. What the passions had been to later Greek philosophy, that the individual soul became to Hobbes, something essentially infinite and insatiable, whose desires grow as they are gratified, whose happiness, if such it can be called, is not a condition of stable repose but of perpetual movement and unrest.556 Here, again, the analogy between physics and ethics obtains. In both, there was an original opposition between the idea of a limit and the idea of infinite expansion. Just as, among the earlier Greek thinkers, there was a physical philosophy of the infinite or, as its impugners called it, the indefinite, so also there was, corresponding to it, a philosophy of the infinite or indefinite in ethics, represented, not indeed by professional moralists, but by rhetoricians and men of the world. Their ideal was not the contented man, but the popular orator or the despot who revels in the consciousness of power��the ability to satisfy his desires, whatever they may be. And the extreme consequence of this principle is drawn by Plato��s Callicles when he declares that true happiness consists in nursing one��s desires up to the highest point at which they can be freely indulged; while his ideal of character is the superior individual who sets at naught whatever restraints have been devised by a weak and timid majority to protect themselves against him. We love to be social,Catch Us On FORE:��I saw him cut the ignition switch!�� declared Sandy defiantly. FORE:"It is possible. It is not for me to say. Only poor Leon must be avenged!" FORE:"What did Mr. Balmayne tell you?" Hetty asked in reply.The celebrated Cartesian paradox, that animals are unconscious automata, is another consequence of the same principle. In Aristotle��s philosophy, the doctrine of potentiality developing itself into act through a series of ascending manifestations, supplied a link connecting the highest rational392 with the lowest vegetal life. The identification of Form with pure thought put an end to the conception of any such intermediate gradations. Brutes must either have a mind like ours or none at all. The former alternative was not even taken into consideration; probably, among other reasons, because it was not easily reconcilable with Christianity; so that nothing remained but to deny sensibility where thought was believed not to exist.