ONE:It may also be remarked that the special knowledge involved in applied mechanics is mainly to be gathered and retained by personal observation and memory, and that this part is the greater one; all the formul? relating to machine construction may be learned in a shorter time than is required to master and understand the operations which may be performed on an engine [8] lathe. Hence first lessons, learned when the mind is interested and active, should as far as possible include whatever is special; in short, no opportunity of learning special manipulation should be lost. If a wheel pattern come under notice, examine the manure in which it is framed together, the amount of draught, and how it is moulded, as well as to determine whether the teeth have true cycloidal curves.
FORE:How much of the complete system known in later times under this name was due to Zeno himself, we do not know; for nothing but a few fragments of his and of his immediate successors writings is left. The idea of combining Antisthenes with Heracleitus, and both with Socrates, probably belongs9 to the founder of the school. His successor, Cleanthes, a man of character rather than of intellect, was content to hand on what the master had taught. Then came another Cypriote, Chrysippus, of whom we are told that without him the Stoa would not have existed;16 so thoroughly did he work out the system in all its details, and so strongly did he fortify its positions against hostile criticism by a framework of elaborate dialectic. Give me the propositions, and I will find the proofs! he used to say to Cleanthes.17 After him, nothing of importance was added to the doctrines of the school; although the spirit by which they were animated seems to have undergone profound modifications in the lapse of ages."it's prusic----" --Page 314
FORE:Her reserve told me that I would not get much information here, and, finishing my beer, I asked:Among the improvements in machine fitting which have in recent years come into general use, is the employment of standard gauges, by means of which uniform dimensions are maintained, and within certain limits, an interchange of the parts of machinery is rendered possible.
FORE:To urge the necessity of learning practical fitting as a part of an engineering education is superfluous. A mechanical engineer who has not been "through the shop" can never expect to attain success, nor command the respect even of the most inferior workmen; without a power of influencing and controlling others, he is neither fitted to direct construction, nor to manage details of any kind connected with engineering industry. There is nothing that more provokes a feeling of resentment in the mind of a skilled man than to meet with those who have attempted to qualify themselves in the theoretical and commercial details of engineering work, and then assume to direct labour which they do not understand; nor is a skilled man long in detecting an engineer of this class; a dozen words in conversation upon any mechanical subject is generally enough to furnish a clue to the amount of practical knowledge possessed by the speaker.The rules for distinguishing between truth and falsehood98 are given in the famous Epicurean Canon. On receiving an image into the mind, we associate it with similar images formerly impressed on us by some real object. If the association or anticipation (πρ?ληψι?) is confirmed or not contradicted by subsequent experience, it is true; false, if contradicted or not confirmed.187 The stress laid on absence of contradictory evidence illustrates the great part played by such notions as possibility, negation, and freedom in the Epicurean system. In ethics this class of conceptions is represented by painlessness, conceived first as the condition, and finally as the essence of happiness; in physics by the infinite void, the inane profundum of which Lucretius speaks with almost religious unction; and in logic by the absence of contradiction considered as a proof of reality. Here, perhaps, we may detect the Parmenidean absolute under a new form; only, by a curious reversal, what Parmenides himself strove altogether to expel from thought has become its supreme object and content.188
