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The work to be performed consists in cutting away the metal between the teeth of a rack, leaving a perfect outline for the teeth; and as the shape of teeth cannot well be obtained by an adjustment of tools, it must be accomplished by the shape of the tools. The shape of the tools must, therefore, be constantly maintained, [155] and as the cross section of the displaced metal is not too great, it may be assumed that the shape of the tools should be a profile of the whole space between two teeth, and such a space be cut away at one setting or one operation. By the application of certain rules laid down in a former place in reference to cutting various kinds of material, reciprocating or planing tools may be chosen instead of rotary or milling tools. CHAPTER XVIIt was nearly four o'clock before Prout raised the trail. On the previous day but one a cashier at the National Credit Bank had changed 400 in gold into notes for a stranger who answered to the description of the murdered man. Prout dashed down to Leadenhall Street in a fast hansom. The cashier was a little nervous, but quite willing to speak freely.
ONE:"I am not very easily impressed," she said, "and as to that Spanish woman--eh, Dr. Bruce must have been taking lessons from Mr. Lawrence."The Countess looked round her helplessly. The sound of the music, the ripple of laughter, the murmur of voices maddened her. She knew that the crash must come some time, but she had not dreamt of a humiliation like this. Lawrence came sauntering down the steps. She flew to him. THREE:268The principal improvements and changes in machine fitting at the present time is in the application of special tools. A lathe, a planing machine, or drilling machine as a standard machine, must be adapted to a certain range of work, but it is evident that if such tools were specially arranged for either the largest or the smallest pieces that come within their capacity, more work could be performed in a given time and consequently at less expense. It is also evident that machine tools must be kept constantly at work in order to be profitable, and when there are not sufficient pieces of one kind to occupy a machine, it must be employed on various kinds of work; but whenever there are sufficient pieces of the same size upon which certain processes of a uniform character are to be performed, there is a gain by having machines constructed to conform as nearly as possible to the requirements of special work, and without reference to any other.
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TWO:"Ah! If I could only lay my hands on a good sum, Louis! Then I might induce Maitrank to wait. For the sake of his own pocket he would keep the secret. He will do nothing so long as he can recover part of his own property.""You are not bound to say anything further, sir," he muttered meaningly.

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TWO:The American beauty shook her head and smiled.2. The use that may be made of air after it has been applied as a motive agent.
FORE:"It's a great discovery, sir," said Prout. "I have found the brother of the murdered man."Through long experience, their deliverance brought,

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FORE:"Funny thing over those notes last night," said the man of money. "I suppose that is what you came to talk to me about."

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FORE:"What's to be done now?" he asked.

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FORE:"The vengeance comes closer," said Prout; "it is closer than you imagine. And I fancy that your evidence will hang the murderer."It was a puzzling one, too. Every policeman who had been on night duty in Lytton Avenue for months was closely examined. Once or twice a night the doors of the house had been tried without effect. Nobody had ever been seen to come away or enter. No suspicious characters had been seen loafing about. Not one of the officers had ever seen a light in the place.

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TWO:Never have thoughts like theseA proof of this proposition is furnished in the case of standard machine tools for metal-cutting, a class of machinery that for many years past has received the most thorough attention at the hands of our best mechanical engineers.
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Having thus far treated of such general principles and facts connected with practical mechanics as might properly precede, and be of use in, the study of actual manipulation in a workshop, we come next to casting, forging, and finishing, with other details that involve manual as well as mental skill, and to which the term "processes" will apply.So we went from street to street, without any result. He rang the bell at many houses where he knew that acquaintances lived, but always in vain, and at last the kind man had to give it up.
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