For milling, drilling or boring ordinary work within its range, a lathe is by no means a makeshift tool, but performs these various operations with nearly all the advantages of machines adapted to each purpose. An ingenious workman who understands the adaptation of a modern engine lathe can make almost any kind of light machinery without other tools, except for planing, and may even perform planing when the surfaces are not too large; in this way machinery can be made at an expense not much greater than if a full equipment of different tools is employed. This of course can only be when no division of labour is required, and when one man is to perform all the several processes of turning, drilling, and so on.
Director
We may, indeed, fairly ask what guarantee against wrong-doing of any kind could be supplied by a system which made the supreme good of each individual consist in his immunity from pain and fear, except that very pain or fear which he was above all things to avoid? The wise man might reasonably give his assent to enactments intended for the common good of all men, including himself among the number; but when his concrete interest as a private citizen came into collision with his abstract interests as a social unit, one does not see how the quarrel was to be decided on Epicurean principles, except by striking a balance between the pains respectively resulting from justice and injustice. Here, Epicurus, in his anxiety to show that hedonism, rightly understood, led to the same results as the accepted systems of morality, over-estimated the policy of honesty. There are cases in which the wrong-doer may count on immunity from danger with more confidence than when entering on such ordinary enterprises as a sea-voyage or a commercial speculation; there are even cases where a single crime might free him from what else would be a lifelong dread. And, at worst, he can fall back on the Epicurean arguments proving that neither physical pain nor death is to be feared, while the threats of divine vengeance are a baseless dream.147The principles of all mechanism for handling loads should be such as to place the power, the rate of movement, and the direction of the force, within the control of an operator, which, as has been pointed out, is the same thing in effect as the action of the human hands.Proceeding from these premises, the first thing should be to examine the action of existing valve gear, to determine where this want of the dead-stroke function can best be supplied, and to gain the aid of such suggestions as existing mechanism may offer, also to see how far the appliances in use may become a part of any new arrangement.