Jeff shook his head."I fancy I have seen you before," she said. "Are you not the detective who has the Corner House mystery in hand?"He was angry and afraid at the same time. Twice already the same policeman had passed the black motor, and had examined it critically. The third time he came round he would be pretty sure to want to know why it was still there. If----
ONE:"It will not be for long, dearest," he whispered. "Courage, darling."
THREE:The importance of a beginner learning to divide what he has to learn into these two departments of special and general, has the advantage of giving system to his plans, and pointing out that part of his education which must be acquired in the workshop and by practical experience. The time and opportunities which might be devoted to learning the technical manipulations of a foundry, for instance, would be improperly spent if devoted to metallurgic chemistry, because the latter may be studied apart from practical foundry manipulation, and without the opportunity of observing casting operations.
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TWO:This object is attained in planing machines by the friction of the belts, which not only cushions the platen like a spring, but in being shifted opposes a gradually increasing resistance until the momentum is overcome and the motion reversed. By multiplying the movement of the platen with levers or other mechanism, and by reason of the movement that is attained by momentum after the driving power ceases to act, it is found practicable to have a platen 'shift its own belts,' a result that would never have been reached by theoretical deductions, and was no doubt discovered by experiment, like the automatic movement of engine valves is said to have been.
TWO:Death was near parting them now if the gleam in Leona Lalage's eyes meant anything. She would have given half her splendour, years of her life, to see that man lying dead at her feet. If she could have slain him and safely disposed of his body she would have done so.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.
FORE:INTRODUCTIONThink back, said Sandy. When school vacations started and we began to stay around the new Floyd Bennett airport that had opened on Barren Island, Jeff had his crate there to take people around the sky for short sight-seeing hops, didnt he?
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FORE:The last guest had departed, the strains of music had died away. The lights were out, and the flowers were wilting on the walls. Leona Lalage had discarded her dress for a fascinating wrap, and was seated in her boudoir making a cigarette and trying to read something from the expression of Lawrence's face.II.
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FORE:To exert a powerful force acting through but a short distance, percussive devices are much more effective and simple than those acting by maintained or direct pressure. A hammer-head may give a blow equal to many tons by its momentum, and absorb the reactive force which is equal to the blow; but if an equal force was to be exerted by screws, levers, or hydraulic apparatus, we can easily see that an abutment would be required to withstand the reactive force, and that such an abutment would require a strength perhaps beyond what ingenuity could devise.I am well aware of the popular opinion that such subjects are too abstruse to be understood by practical mechanicsan assumption that is founded mainly in the fact that the subject of heat and motion are not generally studied, and have been too recently demonstrated in a scientific way to command confidence and attention; but the subject is really no more difficult to understand in an elementary sense than that of the relation between movement and force illustrated in the "mechanical powers" of school-books, which no apprentice ever did or ever will understand, except by first studying the principles of force and motion, independent of mechanical agents, such as screws, levers, wedges, and so on.
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TWO:There was the best part of a mile to go; it was getting very late, but Hetty had not been out all day, so that she enjoyed the walk. She made her way back along the darkness of Alton Square. Most of the houses were dark, and nobody was to be seen.In considering pneumatic machinery there are the following points to which attention is directed:
"What does it all mean?" she asked."If you know where she lives----" Charlton began."It's like this," he said, laying the fateful notes on the table. "A man who has got to be identified is found dead--murdered, beyond a doubt, in an unoccupied house in Raven Street. All the circumstances of the case point to robbery. On searching the body we find a letter written by the deceased to a friend saying that he is forwarding some banknotes. He gives the number of those banknotes amongst others--numbers 190753 to 190793. All this is set out clearly in the letter. Now, will you please to examine those notes, doctor, and tell me the numbers?""Madame, there is but little to tell. You are indebted to that Paris firm for nearly a hundred thousand pounds. They call themselves financial agents, but they are moneylenders of the hardest type. Maitrank is as hard as your diamonds. And he has found you out, Countess."A liveried servant looking into the darkened room murmured that Dr. Bruce had arrived. Bruce came in with his softest professional manner. He was sorry to hear that anything was wrong, he asked a great many pertinent questions.
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