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To obtain a true understanding of the nature of power is by no means the difficulty for a beginner that is generally supposed [12]; and when once reached, the truth will break upon the mind like a sudden discovery, and ever afterwards be associated with mechanism and motion whenever seen. The learner will afterwards find himself analysing the flow of water, the traffic in the streets, the movement of ships and trains; even the act of walking will become a manifestation of power, all clear and intelligible, without that air of mystery that is otherwise inseparable from the phenomena of motion. If the learner will go on farther, and study the connection between heat and force, the mechanical equivalent of heat when developed into force and motion, and the reconversion of power into heat, he will have commenced at the base of what must constitute a thorough knowledge of mechanics, without which he will have to continually proceed under difficulties.

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The difference between hand and machine operations, and the labour-saving effect of machines, will be farther spoken of in another place; the subject is alluded to here, only to enable the reader to more fully distinguish between machinery of transmission and machinery of application. Machinery of application, directed to what has been termed compression processes, such as steam hammers, drops, presses, rolling mills, and so on, act upon material that is naturally soft and ductile, or when it is softened by heat, as in the case of forging. このページの先頭です
ONE:It is well for an apprentice to invent or demonstrate all that he canthe more the better; but as explained in a previous place, what is attempted should be according to some system, and with a proper object. Time spent groping in the dark after something of which no definite conception has been formed, or for any object not to fill an ascertained want, is generally time lost. To demonstrate or invent, one should begin methodically, like a bricklayer builds a wall, as he mortars and sets each brick, so should an engineer qualify, by careful study, each piece or movement that is added to a mechanical structure, so that when done, the result may be useful and enduring.I.
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TWO:The new pilot waved a reassuring glove at Larry and swerved back toward the end of the island. Larry wondered who he was and what his comrades were doing with him; but Larry, always practical, let the questions wait for their eventual answers and continued to study the half-sunken seaplane.

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TWO:"Are you not going to speak first?" Lawrence asked.

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THREE:One of the problems connected with the handling of material is to determine where hand-power should stop and motive-power beginwhat conditions will justify the erection of cranes, hoists, or tramways, and what conditions will not. Frequent mistakes are made in the application of power when it is not required, especially for handling material; the too common tendency of the present day being to apply power to every purpose where it is possible, without estimating the actual saving that, may be effected. A common impression is that motive power, wherever applied to supplant hand labour in handling material, produces a gain; but in many cases the [66] fallacy of this will be apparent, when all the conditions are taken into account.
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THREE:A band was playing somewhere; there were voices pitched high close by; then came the clear laugh of Lady Longmere.
Isidore finished his cigar, after which he took a frugal omnibus to the City, getting down in the neighbourhood of Cheapside. He found himself presently in a dingy office off Ironmonger Lane, and face to face with a fat, oily man, who recognized him with a mixture of admiration and apprehension.I.The commander ruled with a strong hand. They issued not only the usual proclamations about introducing German time, but the commander went even so far as to dictate at what hour the Holy Masses had to be said. In one of the proclamations I read, for example, that in future the Mass of six o'clock, Belgian time, had to be said at the same hour German time. Another proclamation said that skippers were forbidden to sail, and that all boats, including fisher-boats, had been seized.
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