THREE: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.
THREE:
THREE:And leaves us with Plotinus and pure souls.
THREE:But it was not merely in the writings of professed philosophers that the new aspect of Platonism found expression. All great art embodies in one form or another the leading conceptions of its age; and the latter half of the seventeenth century found such a manifestation in the comedies of Molire. If these works stand at the head of French literature, they owe their position not more to their authors brilliant wit than to his profound philosophy of life; or rather, we should say that with him wit and philosophy are one. The comic power of Shakespeare was shown by resolving the outward appearances of this world into a series of dissolving illusions. Like Spinoza and Malebranche, Molire turns the illusion in, showing what perverted opinions men form of themselves and others, through misconceptions and passions either of spontaneous growth or sedulously fostered by designing hands. Society, with him, seems almost entirely made up of pretenders and their dupes, both characters being not unfrequently combined in the same person, who is made a victim through his desire to pass for what he is not and cannot be. And this is what essentially distinguishes the art of Molire from the New Comedy of Athens, which he, like other moderns, had at first felt inclined to imitate until the success of the Prcieuses Ridicules showed him where his true opportunities lay. For the New Comedy was Aristotelian where it was not simply humanist; that is415 to say, it was an exhibition of types like those sketched by Aristotles disciple, Theophrastus, and already prefigured in the masters own Ethics. These were the perennial forms in a world of infinite and perishing individual existences, not concealed behind phenomena, but incorporated in them and constituting their essential truth. The Old Comedy is something different again; it is pre-philosophic, and may be characterised as an attempt to describe great political interests and tendencies through the medium of myths and fables and familiar domesticities, just as the old theories of Nature, the old lessons of practical wisdom, and the first great national chronicles had been thrown into the same homely form.572
THREE:Any truth in mechanics, even the action of the "mechanical powers" before alluded to, is received with an air of mystery, unless the nature of power is first understood. Practical demonstration a hundred times repeated does not create a conviction of truth in mechanical propositions, unless the principles of operation are understood.