THREE:In working to regular scales, such as one-half, one-eighth, or one-sixteenth size, a good plan is to use a common rule, instead of a graduated scale. There is nothing more convenient for a mechanical draughtsman than to be able to readily resolve dimensions into various scales, and the use of a common rule for fractional scales trains the mind, so that computations come naturally, and after a time almost without effort. A plain T square, with a parallel blade fastened on the side of the head, [80] but not imbedded into it, is the best; in this way set squares can pass over the head of a T square in working at the edges of the drawing. It is strange that a draughting square should ever have been made in any other manner than this, and still more strange, that people will use squares that do not allow the set squares to pass over the heads and come near to the edge of the board.In the case of line shafting for manufactories, if the speed varies so much from that of the first movers on machines as to require one or more intermediate or countershafts, the expense would be very great; on the contrary, if countershafts can be avoided, there is a great saving of belts, bearings, machinery, and obstruction. The practical limit of speed for line shafts is in a great measure dependent upon the nature of the bearings, a subject that will be treated of in another place.
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TWO:The activities of the soul are thought, sensation, reasoning, desire, attention, and so forth: the activities of body are heat, cold, impact, and gravitation; if to these we add the characteristics of mind, the latter will have no special properties by296 which it can be known. And even in body we distinguish between quantity and quality; the former, at most, being corporeal, and the latter not corporeal at all. Here Plotinus just touches the idealistic method of modern spiritualism, but fails to follow it any further. He seems to have adopted Aristotles natural realism as a sufficient theory of external perception, and to have remained uninfluenced by Platos distrust of sensible appearances.
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ONE:I asked him how things were farther on along the Meuse, but he knew nothing. He was stationed here, he said, and was going to stay as long as possible. As soon as the Germans arrived, most people fled, and those who had stayed on were no longer allowed to leave. So he lacked all information, and only understood that fierce fighting was going on, as was confirmed by the incessant thunder of the20 guns. Fort Pontisse was, moreover, not so very far away, and frequently we could distinctly tell, by their whistling sound, in which direction the shells flew.
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