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ONE:The expense of patterns should be divided among and charged to the machines for which the patterns are employed, but there can be no constant rules for assessing or dividing this cost. A pattern may be employed but once, or it may be used for years; it is continually liable to be superseded by changes and improvements that cannot be predicted beforehand; and in preparing patterns, the question continually arises of how much ought to be expended on them��a matter that should be determined between the engineer and the pattern-maker, but is generally left to the pattern-maker alone, for the reason that but few mechanical engineers understand pattern-making so well as to dictate plans of construction.

ONE:The End

ONE:There was the sound of a faint scratching as if a mouse was working somewhere. The warder in the courtyard pronounced it to be a mouse and passed on. Then a figure, almost invisible in the gloom, crept along the top of the wall and dropped feet foremost into the street. It was nothing but luck that stood Ren�� Lalage in such good stead all along. A crumbling bit of plaster, some repairs going on in the gallery overhead, a ladder and a couple of gimlets left about by one of the carpenters engaged on the job.

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TWO:Drawings represent and explain the machinery to which they relate as the symbols in algebra represent quantities, and in a degree admit of the same modifications and experiments to which the machinery itself could be subjected if it were already constructed. Drawings are also an important aid in developing designs or conceptions. It is impossible to conceive of, and retain in the mind, all the parts of a complicated machine, and their relation to each other, without some aid to fix the various ideas as they arise, and keep them in sight for comparison; like compiling statistics, the footings must be kept at hand for reference, and to determine the relation that one thing may bear to another.

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THREE:These minor actions formed part of the sortie by the Belgians from Antwerp. One division marched towards Louvain and occupied Aerschot on Thursday evening, September 10th. On Friday they advanced farther in the direction of Wijgmaal-Rotselair-Corbeek-Loo, with continuous hard fighting. On Saturday the fights were fiercest round about these places, and ended in the evening in a retreat171 of the Belgians, who made the enemy pay as heavily as possible for their victory, although they themselves had to leave behind a good many victims.The duplicate system has gradually made its way in locomotive engineering, and will no doubt extend to the whole of [150] railway equipment, as constants for dimensions are proved and agreed upon.