THREE:Examining machines made by the best designers, it will be found that their dimensions bear but little if any reference to calculated strains, especially in machines involving rapid motion. Accidents destroy constants, and a draughtsman or designer who does not combine special and experimental knowledge with what he may learn from general sources, will find his services to [89]be of but little value in actual practice.
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TWO:Lanaeken seemed to have been reoccupied by the Belgians, after the occurrences of the previous Sunday. When I entered the place, I found the192 greater number of the men round about the station.A remarkable circumstance connected with the evidence afforded by the figured monuments is its progressive cha239racter. According to M. Ravaisson, As time goes on, the indications of belief in a future life, instead of becoming fainter, grow clearer and more distinct. More and more exalted ideas are formed of the souls destiny, and ever increasing honours are paid to the dead. Moreover, these ideas and practices are extended so as to cover a greater number of individuals. At first it would seem that the only persons whose fate excites any interest are kings and heroes, the children or the descendants of the gods; in the course of time many others, and at last all, or nearly all, are admitted to a share in the same regard. The ancient principle that happiness is reserved for those who resemble the gods remains unchanged; but the notion of what constitutes resemblance to the gods, or in other words perfection, gradually becomes so modified, that all men may aspire to reach it.370
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TWO:If the Roman conquest did not altogether put an end to these sentiments, it considerably mitigated their intensity. The imperial city was too strong to feel endangered by the introduction of alien deities within its precincts. The subject states were relieved from anxiety with regard to a political independence which they had irrecoverably lost. Moreover, since the conquests of Alexander, vast aggregations of human beings had come into existence, to which the ancient exclusiveness was unknown, because they never had been cities at all in the ancient sense of the word. Such were Alexandria and Antioch, and these speedily became centres of religious syncretism. Rome herself, in becoming the capital of an immense empire, acquired the same cosmopolitan character. Her population consisted for the most part of emancipated slaves, and of adventurers from all parts of the world, many of whom had brought their national faiths with them, while all were ready to embrace any new faith which had superior attractions to offer. Another important agent in the diffusion and propagation of new religions was the army. The legions constituted a sort of migratory city, recruited from all parts of the empire, and moving over its whole extent. The dangers of a military life combined with its authoritative ideas are highly favourable to devotion; and the soldiers could readily adopt new modes for the expression of this feeling both from each other and from the inhabitants of the countries where they were stationed, and would in turn204 become missionaries for their dissemination over the most distant regions. That such was actually the case is proved by numerous religious inscriptions found in the neighbourhood of Roman camps.313In considering pneumatic machinery there are the following points to which attention is directed:
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ONE:All moving parts must of course be independent of fixed parts, the relation between the two being maintained by what has been called running joints.In planing and turning, the tools require no exact form; they can be roughly made, except the edge, and even this, in most cases, is shaped by the eye. Such tools are maintained at a trifling expense, and the destruction of an edge is a matter of no consequence. The form, temper, and strength can be continually adapted to the varying conditions of the work and the hardness of material. The line of division between planing and milling is fixed by two circumstancesthe hardness and uniformity of the material to be cut, and the importance of duplication. Brass, clean iron, soft steel, or any homogeneous metal not hard enough to cause risk to the tools, can be milled at less expense than planed, provided there is enough work of a uniform character to justify the expense of milling tools. Cutting the teeth of wheels is an example where milling is profitable, but not to the extent generally supposed. In the manufacture of small arms, sewing machines, clocks, and especially watches, where there is a constant and exact duplication of parts, milling is indispensable. Such manufactures are in some cases founded on milling operations, as will be pointed out in another chapter.
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TWO:CHAPTER XXI. PERIL.Referring first to the saving effected by combining several operations in one machine, there is perhaps not one constructor in twenty that ever stops to consider what is really gained, and perhaps not one purchaser in a hundred that does the same thing. The impression is, that when one machine performs two operations it saves a second machine. A remarkable example of this exists in the manufacture of combination machines in Europe for working wood, where it is common to find complicated [69] machines that will perform all the operations of a joiner's shop, but as a rule only one thing at a time, and usually in an inconvenient manner, each operation being hampered and interfered with by another; and in changing from one kind of work to another the adjustments and changes generally equal and sometimes exceed the work to be done. What is stranger still is, that such machines are purchased, when their cost often equals that of separate machines to perform the same work.
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