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Machines and tools operating by percussive action, although they comprise a numerous class, and are applied in nearly all mechanical operations, have never received that amount of attention in text-books which the importance of the machines and their extensive use calls for. Such machines have not even been set off as a class and treated of separately, although the distinction is quite clear between machines with percussive action, and those with what may be termed direct action, both in the manner of operating and in the general plans of construction. There is, of course, no lack of formul? for determining the measure of force, and computing the dynamic effect of percussive machines acting against a measured or assumed resistance, and so on; but this is not what is meant. There are certain conditions in the operation of machines, such as the strains which fall upon supporting frames, the effect produced upon malleable material when struck or pressed, and more especially of conditions which may render percussive or positive acting machines applicable to certain purposes; but little explanation has been given which is of value to practical men.

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In ages past, various attempts were made to find some constant in nature on which measures could be based. Some of these attempts were ludicrous, and all of them failures, until the vibrations of a pendulum connected length and space with time. The problem was then more easy. The changes of seasons and the movement of heavenly bodies had established measures of time, so that days, hours, and minutes became constants, proved and maintained by the unerring laws of nature.A learner will no doubt wonder why sand is used for moulding, instead of some more adhesive material like clay. If he is not too fastidious for the experiment, and will apply a lump of damp moulding sand to his mouth and blow his breath through the mass, the query will be solved. If it were not for the porous nature of sand-moulds they would be blown to pieces as soon as the hot metal entered them; not only because of the mechanical expansion of the gas, but often from explosion by combustion. Gas jets from moulds, as may be seen at any time when castings are poured, will take fire and burn the same as illuminating gas. このページの先頭です
ONE:Epicurus was assuredly not a master of language, but had he meant all that is here put into his mouth, he would hardly have been at a loss for words to say it. Remembering that the Κ?ριαι δ?ξαι constituted a sort of creed drawn up by the master himself for his disciples to learn by heart,144 and that the incriminated passage is one of the articles in that creed, we need only look at the context to make certain that it has been entirely misread by his apologist.145 In the three preceding articles, we are told that justice is by nature a contract for the prevention of aggressions, that it does not exist among animals which are unable, nor among tribes of men which are either unable or unwilling to enter into such an agreement, andwith reiterated emphasisthat, apart from contracts, it has no original existence (o?κ ?ν τ? καθ ?αυτ? δικαιοσ?νη). There is nothing at all about a true as distinguished from a false justice; there is no allusion whatever to the theories of any contemporaries of Socrates; the polemic reference, if any, is to Plato, and to Plato alone. Then comes the declaration quoted above, to the effect that injustice is not an evil in itself, but only an evil through the dread of punishment which it produces. Now, by injustice, Epicurus must simply mean the opposite of what he defined justice to be in the preceding paragraphthat is, a breach of the agreement not to hurt one another (μ? βλ?πτειν ?λλ?λου?). The authority of the State is evidently conceived, not as superseding, but as enforcing agreements. The succeeding article still further confirms the view rejected by Mr. Wallace. Epicurus tells us that no man who stealthily evades the contract to abstain from mutual aggressions can be sure of escaping detection. This is72 evidently added to show that, apart from any mystical sanctions, fear of punishment is quite enough to deter a prudent man from committing crimes. And we can see that no other deterrent was recognised by Lucretius, when, in evident reference to his masters words, he mentions the fears of those who offendnot against mere conventional rules, but against human rights in generalas the great safeguard of justice.146
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ONE:Trip-hammers employed in forging bear a close analogy to, and were no doubt first suggested by, hand-hammers. Being the oldest of power-forging machines, and extensively employed, it will be proper to notice trip-hammers before steam-hammers.
TWO:while in his tragedies we have the realisation of those worldsthe workings of an eternal justice which alone remains faithful to one purpose through the infinite flux of passion and of sense.
THREE: CHAPTER V
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THREE:In a half century past all has changed; the application of the sciences, the utilisation of natural forces, manufacturing, the transportation of material, the preparation and diffusion of printed matter, and other great matters of human interest, have come to shape our laws, control commerce, establish new relations between people and countriesin short, has revolutionised the world. So rapid has been this change that it has outrun the powers of conception, and people waken as from a dream to find themselves governed by a new master.