2021-04-18 11:41:20

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ENGLISH This mode of reasoning will lead to proper estimates of the difference in value between good tools and inferior tools; the results of performance instead of the investment being first considered, because the expenses of operating are, as before assumed, usually ten times as great as the interest on the value of a machine.The permanent contraction of steel in tempering is as the degree of hardness imparted to it by the bath.

Invention, as applied to mechanical improvements, should not mean chance discovery. Such a meaning is often, if not generally, attached to the term invention, yet it must be seen that results attained by a systematic course of reasoning or experimenting can have nothing to do with chance or even discovery. Such results partake more of the nature of demonstrations, a name peculiarly suitable for such inventions as are the result of methodical purpose.I am well aware how far this opinion is at variance with practice, especially in England; yet careful observation in a workshop [140] will prove that power feed in ordinary drilling effects no saving of time or expense.

CHAPTER XXXII. SLOTTING MACHINES.I had a short chat with the wounded men near the various houses, on demand showed my passport to those in authority, and was advised as a friendly Netherlander to return, as it was extremely dangerous on the road. But I did not dream of doing34 this, as long as I was not compelled, and went on towards Lige amidst this maddening thunder.

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2. Plans of adaptation and arrangement of the component parts of the machinery, or organisation as it may be called.As I felt myself one with the population, I uncovered my head and enthusiastically joined in the cry: "Au revoir! Au revoir!"The Germans did themselves great injury undoubtedly by their vulgar and barbarous demeanour, for that lost them every claim on the sympathy of the people.

Many shops were closed on account of lack of stock, as everything had been requisitioned, and as yet no traffic was allowed to bring in fresh pro109visions. All this bother made the inhabitants discontented, but frightened them at the same time; they grumbled and whispered, and looked about with malicious, flaming eyes, but in mortal fear.In using ruling pens, they should be held nearly vertical, leaning just enough to prevent them from catching on the paper. Beginners have a tendency to hold pens at a low angle, and drag them on their side, but this will not produce clean sharp lines, nor allow the lines to be made near enough to the edges of square blades or set squares.

From the other side came two soldiers, one of whom she recognised, as he had been billeted on her. Constantly weeping, her face distorted, she sent another glance towards that fiery blaze, looked at the soldier as if reprovingly, hesitated a moment, but then pressed the enemy's hand, sobbing: "Adieu!adieu!"

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It is exceedingly difficult for an apprentice engineer, without experimental knowledge, to choose plans for his own education, or to determine the best way of pursuing such plans when they have been chosen; and there is nothing that consumes so much time, or is more useless than attempting to make original designs, if there is not some systematic method followed.Such a proposition would constitute the first stage of an invention by demonstrating a fault in existing hammers, and a want of certain functions which if added would make an improvement."The behaviour of the soldiers during the night, with very few exceptions, makes a scandalous impression.

INTRODUCTIONIn sketches and drawings made for practice, such as are not intended for the shop, it is suggested that metrical scales be employed; it will not interfere with feet and inches, and will prepare the mind for the introduction of this system of lineal measurement, which may in time be adopted in England and America, as it has been in many other countries.

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