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THREE: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.(1.) What is the difference between geometric and artistic drawing?��(2.) What is the most important operation in making a good drawing?��(3.) Into what three classes can working drawings be divided?��(4.) Explain the difference between elevations and plans.��(5.) To what extent in general practice is the proportion of parts and their arrangement in machines determined mathematically?

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THREE:Mechanical engineering, like every other business pursuit, is directed to the accumulation of wealth; and as the attainment of any purpose is more surely achieved by keeping that purpose continually in view, there will be no harm, and perhaps considerable gain derived by an apprentice considering at the beginning the main object to which his efforts will be directed after learning his profession or trade. So far as an abstract principle of motives, the subject is of course unfit to consider in connection with engineering operations, or shop manipulation; but business objects have a practical application to be followed throughout the whole system of industrial pursuits, and are as proper to be considered in connection with machine-manufacturing as mechanical principles, or the functions and operation of machines.Antisthenes and his school, of which Diogenes is the most popular and characteristic type, were afterwards known as Cynics; but the name is never mentioned by Plato and Aristotle, nor do they allude to the scurrility and systematic indecency afterwards associated with it. The anecdotes relating to this unsavoury subject should be received with extreme suspicion. There has always been a tendency to believe that philosophers carry out in practice what are vulgarly believed to be the logical consequences of their theories. Thus it is related of Pyrrho the Sceptic that when6 out walking he never turned aside to avoid any obstacle or danger, and was only saved from destruction by the vigilance of his friends.9 This is of course a silly fable; and we have Aristotle��s word for it that the Sceptics took as good care of their lives as other people.10 In like manner we may conjecture that the Cynics, advocating as they did a return to Nature and defiance of prejudice, were falsely credited with what was falsely supposed to be the practical exemplification of their precepts. It is at any rate remarkable that Epict��tus, a man not disposed to undervalue the obligations of decorum, constantly refers to Diogenes as a kind of philosophical saint, and that he describes the ideal Cynic in words which would apply without alteration to the character of a Christian apostle.11

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