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FORE:The force of gravity acts only in one direction��vertically, so that the main force of hoisting and handling machinery which opposes gravity must also act vertically, while the horizontal movement of objects may be accomplished by simply overcoming the friction between them and the surfaces on which they move. This is seen in practice. A force of a hundred pounds may move a loaded truck, which it would require tons to lift; hence the horizontal movements of material may be easily accomplished by hand with the aid of trucks and rollers, so long as it is moved on level planes; but if a weight has to be raised even a single inch by reason of irregularity in floors, the difference between overcoming frictional contact and opposing gravity is at once apparent.The truth is that no man who philosophised at all was ever more free from tormenting doubts and self-questionings; no man was ever more thoroughly satisfied with himself than Socrates. Let us add that, from a Hellenic point of view, no man had ever more reason for self-satisfaction. None, he observed in his last days, had ever lived a better or a happier life. Naturally possessed of a powerful constitution, he had so strengthened it by habitual moderation and constant training that up to the hour of his death, at the age of seventy, he enjoyed perfect bodily and mental health. Neither hardship nor exposure, neither abstinence nor indulgence in what to other men would have been excess, could make any impression on that adamantine frame. We know not how much truth there may be in the story that, at one time, he was remarkable for the violence of his passions; at any rate, when our principal informants knew him he was conspicuous for the ease with which he resisted temptation, and for the imperturbable sweetness of his temper. His wants, being systematically reduced to a minimum, were easily satisfied, and his cheerfulness never failed. He enjoyed Athenian society so much that nothing but military duty could draw him away from it. For Socrates was a veteran who had served through three arduous campaigns, and could give lectures on the duties of a general, which so high an authority as Xenophon thought worth reporting. He seems to have been on excellent terms with his fellow-citizens, never having been engaged in a lawsuit, either as plaintiff or defendant, until the fatal prosecution which brought his career to a close. He could, on that occasion, refuse to prepare a defence, proudly observing that his whole123 life had been a preparation, that no man had ever seen him commit an unjust or impious deed. The anguished cries of doubt uttered by Italian and Sicilian thinkers could have no meaning for one who, on principle, abstained from ontological speculations; the uncertainty of human destiny which hung like a thunder-cloud over Pindar and the tragic poets had melted away under the sunshine of arguments, demonstrating, to his satisfaction, the reality and beneficence of a supernatural Providence. For he believed that the gods would afford guidance in doubtful conjunctures to all who approached their oracles in a reverent spirit; while, over and above the Divine counsels accessible to all men, he was personally attended by an oracular voice, a mysterious monitor, which told him what to avoid, though not what to do, a circumstance well worthy of note, for it shows that he did not, like Plato, attribute every kind of right action to divine inspiration.

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