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    Software name: appdown
    Software type: Microsoft Framwork

    size: 129MB

    Lanuage:Englist

    Software instructions

      5. Every part laid down has something to govern it that may be termed a "base"some condition of function or position which, if understood, will suggest size, shape, and relation to other parts. By searching after a base for each and every part and detail, the draughtsman proceeds upon a regular system, continually maintaining a test of what is done. Every wheel, shaft, screw or piece of framing should be made with a clear view of the functions it has to fill, and there are, as before said, always reasons why such parts should be of a certain size, have such a speed of movement, or a certain amount of bearing surface, and so on. These reasons or conditions may be classed as expedient, important, or essential, and must be estimated accordingly. As claimed at the beginning, the designs of machines can only in a limited degree be determined by mathematical data. Leaving out all considerations of machine operation with which books have scarcely attempted to deal, we have only to refer to the element of strains to verify the general truth of the proposition.


      "About half-past-four. It must have been about that time, because just after I got back to my room the clock struck five. A motor car came up, one of the quietest I have ever heard. As the woman got in she stumbled, and the man swore at her. Then there was the strangest thing, the dull side of the motor car gleamed in places like silver, as if something had been rubbed off it by the woman as she fell. What do I think it was? Well, so far as I could make out, the car was all hung with black crape."At any rate, she must act. If it turned out to be a hoax she could apologise afterwards. But, on the other hand, it might be a matter of life and death; it might affect her lover's honour. It was a good thing that Hetty had been fortunate to handle the telegram where she could be secluded from the sharp eyes of her employer. Otherwise she would assuredly have betrayed herself. She tore the telegram into tiny fragments and pushed them under the edge of one of the mats. It was far better to be cautious.


      Falling in love had revealed the matter in a very different light. It was quite worth while yielding to fashion in order to win the affection of Rose Lomas. And so he had imitated his rivals. He cast aside all ties that revealed their linings, trimmed up the cuffs of his shirts; overcame with an effort a natural repugnance to wearing his best clothes; and generally submitted himself to that daily supervision of superficial matters which he could now regard as the prelude to happy hours. And Rose, interested in that conquest of himself for her sake, had soon learned how much there was beneath the polished surface to capture her heart.

      "Not at all, sir. I'm sorry to seem so; it's not the tip-top of courtesy,--"


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      By degrees Hetty told her story. It was real enough to her, but to Bruce's practical mind it sounded unsubstantial and shadowy. After all, she might easily have imagined the face at the window, and as to the man in the morning room, he had only been mistily reflected in a dim old mirror.

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      The engineering apprentice, as a rule, has a desire to make drawings as soon as he begins his studies or his work, and there is not the least objection to his doing so; in fact, there is a great deal gained by illustrating movements and the details of machinery at the same time of studying the principles. Drawings if made should always be finished, carefully inked in, and memoranda made on the margin of the sheets, with the date and the conditions under which the drawings were made. The sheets should be of uniform size, not too large for a portfolio, and carefully preserved, no matter how imperfect they may be. An apprentice who will preserve his first drawings in this manner will some day find himself in possession of a souvenir that no consideration would cause him to part with.

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      "How did you make her acquaintance?" I ventured to ask.A scraping of a match, a flood of light again, a queer half-amused smile on the Spaniard's face, as she noted Bruce's expression. Then the front door was opened, and he was bowed out politely. Before he had time to cross the road the light was out again, and the whole house in darkness.


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