The means of supporting cores must be devised, or at least understood, by pattern-makers; these supports consist of 'prints' and 'anchors.' Prints are extensions of the cores, which project through the casting and extend into the sides of the mould, to be held by the sand or by the flask. The prints of cores have duplicates on the patterns, called core prints, which are, or should be, of a different colour from the patterns, so as to distinguish one from the other. The amount of surface required to support cores is dependent upon their weight, or rather upon their cubic contents, because the weight of a core is but a trifling matter [96] compared to its floating force when surrounded by melted metal. An apprentice in studying devices for supporting cores must remember that the main force required is to hold them down, and not to bear their weight. The floating force of a core is as the difference between its weight and that of a solid of metal of the same sizea matter moulders often forget to consider. It is often impossible, from the nature of castings, to have prints large enough to support the cores, and it is then effected by anchors, pieces of iron that stand like braces between the cores and the flasks or pieces of iron imbedded in the sand to receive the strain of the anchors.
The performance came to an end at length. The dapper, smiling little Balmayne handed them both into the carriage and then went off smoking a cigarette like any honest gentleman whose conscience is at peace. Once home Hetty flew up to her little patient. She seemed to be restless and disturbed.
FORE:That Plato put forward the ethical theory of the Protagoras in perfect good faith cannot, we think, be doubted; although in other writings he has repudiated hedonism with contemptuous aversion; and it seems equally evident that this was his earliest contribution to positive thought. Of all his theories it is the simplest and most Socratic; for Socrates, in endeavouring to reclaim the foolish or vicious, often spoke as if self-interest was the paramount principle of human nature; although, had his assumption been formulated as an abstract proposition, he too might have shrunk from it with something of the uneasiness attributed to Protagoras. And from internal evidence of another description we have reason to think that the Dialogue in question is a comparatively juvenile production, remembering always that the period of youth was much more189 protracted among the Greeks than among ourselves. One almost seems to recognise the hand of a boy just out of college, who delights in drawing caricatures of his teachers; and who, while he looks down on classical scholarship in comparison with more living and practical topics, is not sorry to show that he can discuss a difficult passage from Simonides better than the professors themselves.CHAPTER XXV. CRANK-HAMMERS.
Under the guidance of a somewhat similar principle the Stoic logicians attempted a reform of Aristotles categories. These they reduced to four: Substance, Quality, Disposition, and Relation (τ? ?ποκε?μενον, τ? ποι?ν, τ? π?? ?χον, and τ? πρ?? τι π?? ?χον41); and the change was an improvement in so far as it introduced a certain method and subordination where none existed before; for each category implies, and is contained in, its predecessor; whereas the only order traceable in Aristotles categories refers to the comparative frequency of the questions to which they correspond.58They crept round there unseen by dint of this and that doorway, but there was no luck that night. The little gate was fast. Hetty had seen to that. She had made up her mind to know what time the Countess returned, together with all other information possible.The race was out of their hands.Lawrence chuckled. He could see further than his companion. He could see the figure of a woman dressed in foreign fashion with a shawl over her head. She had long fair hair. Her back was to the window all this time.