ONE:Cores are employed mainly for what may be termed the displacement of metal in moulds. There is no clear line of distinction between cores and moulds, as founding is now conducted; cores may be of green sand, and made to surround the exterior of a piece, as well as to make perforations or to form recesses within it. The term 'core,' in its technical sense, means dried moulds, as distinguished from green sand. Wheels or other castings are said to be cast in cores when the moulds are made in pieces and dried. Supporting and venting cores, and their expansion, are conditions to which especial attention [95] is called. When a core is surrounded with hot metal, it gives off, because of moisture and the burning of the 'wash,' a large amount of gas which must have free means of escape. In the arrangement of cores, therefore, attention must be had to some means of venting, which is generally attained by allowing them to project through the sides of the mould and communicate with the air outside. FORE:Moulders generally rap patterns as much as they will stand, often more than they will stand; and in providing for draught it is necessary to take these customs into account. There is no use in making provision to save rapping unless the rapping is to be omitted."We are neutrals!"

ONE:In point of style, Plotinus is much the most difficult of the ancient philosophers, and, in this respect, is only surpassed by a very few of the moderns. Even Longinus, who was one of the most intelligent critics then living, and who, besides,283 had been educated in the same school with our philosopher, could not make head or tail of his books when copies of them were sent to him by Porphyry, and supposed, after the manner of philologists, that the text must be corrupt, much to the disgust of Porphyry, who assures us that its accuracy was unimpeachable.426 Probably politeness prevented Longinus from saying, what he must have seen at a glance, that Plotinus was a total stranger to the art of literary composition. We are told that he wrote as fast as if he were copying from a book; but he had never mastered even the elements of the Greek language; and the weakness of his eyesight prevented him from reading over what he had written. The mistakes in spelling and grammar Porphyry corrected, but it is evident that he has made no alterations in the general style of the Enneads; and this is nearly as bad as bad can be��disjointed, elliptical, redundant, and awkward. Chapter follows chapter and paragraph succeeds to paragraph without any fixed principle of arrangement; the connexion of the sentences is by no means clear; some sentences are almost unintelligible from their extreme brevity, others from their inordinate length and complexity. The unpractised hand of a foreigner constantly reveals itself in the choice and collocation of words and grammatical inflections. Predicates and subjects are huddled together without any regard to the harmonies of number and gender, so that even if false concords do not occur, we are continually annoyed by the suggestion of their presence.427 FORE:We now turn to Sir A. Grant, who, as was mentioned at371 the beginning of the last chapter, makes Aristotle a supporter of the late Prof. Ferrier. We will state the learned Principal��s view in his own words:��"Because I feel quite sure it isn't there," said Lawrence. "Now take my keys, Hetty. I am pretty methodical, as you know; I always know exactly where to put my hand on everything. Unlock the panel on the left-hand side. Tell me what you can see in the pigeonhole to the right."

ONE:

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THREE:Finishing as a process is a secondary and not always an essential one; many parts of machinery are ready for use when forged or cast and do not require fitting; yet a finishing shop must in many respects be considered the leading department of an engineering establishment. Plans, drawings and estimates are always based on finished work, and when the parts have accurate dimensions; hence designs, drawings and estimates may be said to pass through the fitting shop and follow back to the foundry and smith shop, so that finishing, although the last process in the order of the work, is the first one after the drawings in every other sense; even the dimensions in pattern-making which seems farthest removed from finishing, are based upon fitting dimensions, and to a great extent must be modified [119]by the conditions of finishing.

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ONE:26

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THREE:So far Spinoza, following the example of Stoicism, has only studied the means by which reason conquers passion. He now proceeds to show, in the spirit of Plato or of Platonic Christianity, how immensely superior to the pleasures of sense and opinion are those afforded by true religion��by the love of God and the possession of eternal life. But, here also, as in the Greek system, logic does duty for emotion. The love of God means no more than viewing ourselves as filling a place in the infinite framework of existence, and as determined to be what we are by the totality of forces composing it. And eternal life is merely the adjustment of our thoughts to the logical order by which all modes of existence are deducible from the idea of infinite power.IX.

ONE:"After that," he muttered, "I give it up; it's beyond me."

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A beginner, unless he exercises great care in the pencil-work of a drawing, will have the disappointment to find the paper soon becoming dirty from plumbago, and the pencil-lines crossing each other everywhere, so as to give the whole a slovenly appearance. He will also, unless he understands the nature of the operations in which he is engaged, make the mistake of regarding the pencil-work as an unimportant part, instead [82]of constituting, as it does, the main drawing, and thereby neglect that accuracy which alone can make either a good-looking or a valuable one.

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To follow this matter further. It will be found in such machines as are directed mainly to augmenting force or increasing the amount of power that may be applied in any operation, such as sawing wood or stone, the effect produced when compared to hand labour is nearly as the difference in the amount of power applied; and the saving that such machines effect is generally in the same proportion. A machine that can expend ten horse-power in performing a certain kind of work, will save ten times as much as a machine directed to the same purpose expending but one horse-power; this of course applies to machines for the performance of the coarser kinds of work, and employed to supplant mere physical effort. In other machines of application, such as are directed mainly to guidance, or speed of action, such as sewing machines, dove-tailing machines, gear-cutting machines, and so on, there is no relation whatever between the increased [59] effect that may be produced and the amount of power expended.

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