THREE:A drawing being inked in, the next things are tints, dimension, and centre lines. The centre lines should be in red ink, and pass through all points of the drawing that have an axial centre, or where the work is similar and balanced on each side of the line. This rule is a little obscure, but will be best understood if studied in connection with a drawing, and perhaps as well [84] remembered without further explanation."But what can I suggest? This thing has taken me utterly by surprise. The only thing is to carry that thing back into the street and lay him down where you found him. A policeman saw him leave the house. It will be thought that he had a fit in the street, and we shall not be suspected."
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TWO:In the immediate neighbourhood of the railway station a house was being built, of which only the foundations were laid. The place showed nothing beyond a huge cavity. I had noticed already several times that there was an atrocious stench near the station, which at last became unendurable. Pastor Claes, who courageously entered all destroyed houses to look for the dead, had discovered the victims also in this place. In the cave just mentioned he found sixteen corpses of burghers, two priests among them. In order to remove them from the street the Germans had simply thrown them into that cave, without covering the corpses in any way. They had been lying there for days, and were decaying rapidly.Success in Technical Training, as in other kinds of education, must depend greatly upon how well the general mode of thought among learners is understood and followed; and if the present work directs some attention to this matter it will not fail to add something to those influences which tend to build up our industrial interests.
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TWO:Maitrank looked up with a wolfish gleam in his eyes."The inhabitants, frightened and perplexed, hid themselves in the houses.
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ONE:The sudden and varied resistance to line shafts tends to loosen couplings, destroy gearing, and produce sudden strains that are unknown in other cases; and shafting arranged with the usual proportions for transmitting power will soon fail if applied to driving trip-hammers. Rigid connections or metal attachments ace impracticable, and a slipping belt arranged so as to have the tension varied at will is the usual and almost the only successful means of transmitting power to hammers. The motion of trip-hammers is a curious problem; a head and die weighing, together with the irons for attaching them, one hundred pounds, will, with a helve eight feet long, strike from two to three hundred blows a minute. This speed exceeds anything that could be attained by a direct reciprocal motion given to the hammer-head by a crank, and far exceeds any rate of speed that would be assumed from theoretical inference. The hammer-helve being of wood, is elastic, and acts like a vibrating spring, its vibrations keeping in unison with the speed of the tripping points. The whole machine, in fact, must be constructed upon a principle of elasticity throughout, and in this regard stands as an exception to almost every other known machine. The framing for supporting the trunnions, which one without experience would suppose should be very rigid and solid, is found to answer best when composed of timber, and still better when this timber is laid up in a manner that allows the structure to spring and [107] yield. Starting at the dies, and following back through the details of a trip-hammer to the driving power, the apprentice may note how many parts contribute to this principle of elasticity: Firstthe wooden helve, both in front of and behind the trunnion; nextthe trunnion bar, which is usually a flat section mounted on pivot points; thirdthe elasticity of the framing called the 'husk,' and finally the frictional belt. This will convey an idea of the elasticity required in connecting the hammer-head with the driving power, a matter to be borne in mind, as it will be again referred to.CHAPTER XXIII. FORGING.
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TWO:(1.) Describe the different modifications of screw-cutting machines.(2.) What is gained by revolving the dies instead of the rod?(3.) What is gained by expanding dies?(4.) What is the difference between screws cut by chasing and those cut on a screw-cutting machine?Leona Lalage was off the sofa directly. She motioned to the door. As Hetty came back the sufferer crossed the room languidly, saying she was going to lie down on her bed. She required no attention, she only wanted to be absolutely quiet.
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