ONE:In constructing patterns where it is optional whether to employ cores or not, and in preparing drawings for castings which may have either a ribbed or a cored section, it is nearly always best to employ cores. The usual estimate of the difference between the cost of moulding rib and cored sections, as well as of skeleton and cored patterns, is wrong. The expense of cores is often balanced by the advantage of having an 'open mould,' that is accessible for repairs or facing, and by the greater durability and convenience of the solid patterns. Taking, for example, a column, or box frame for machinery, that might be made either with a rib or a cored section, it would at first thought seem that patterns for a cored casting would cost much more by reason of the core-boxes; but it must be remembered that in most patterns labour is the principal expense, and what is lost in the extra lumber required for a core-box or in making a solid pattern is in many cases more than represented in the greater amount of labour required to construct a rib pattern.
TWO:It may safely be assumed that the prejudices once entertained against Epicureanism are now extinct. Whatever may have been the speculative opinions of its founder, he had as good a right to them as the Apostles had to theirs; nor did he stand further aloof from the popular religion of any age than Aristotle, who has generally been in high favour with theologians. His practical teaching was directed towards the constant inculcation of virtue; nor was it belied by the conduct either of himself or of his disciples, even judged by the standard of the schools to which they were most opposed. And some of his physical theories, once rejected as self-evidently absurd, are now proved to be in harmony with the sober conclusions of modern science. At any rate, it is not in this quarter, as our readers will doubtless have already perceived, that the old prejudices, if they still exist, are likely to find an echo. Just now, indeed, the danger is not that Epicurus should be depreciated, but that his merits should obtain far more than their proper meed of recognition. It seems to be forgotten that what was best in his physics he borrowed from others, and that what he added was of less than no value; that he was ignorant or careless of demonstrated truths; that his avowed principles of belief were inconsistent with any truth rising above the level of vulgar apprehension; and finally, that in his system scientific interests were utterly subordinated to practical interests.
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sollicitudin aliquet.
