For compasses, the lead points should be cylindrical, and fit into a metal sheath without paper packing or other contrivance to hold them; and if a draughtsman has instruments not arranged in this manner, he should have them changed at once, both for convenience and economy.
"I am afraid of her; I mistrust her; she frightens me. Call it prejudice if you like, but there is something wrong about that woman. Did she find out anything about us last night, Gordon?"Or Justice most unjustly were she calledHe counted out forty 5 Bank of England notes on the table with a hand that trembled strangely. He seemed restless and eager to be away now, as if fearful that Bruce might change his mind. The whole thing might have been a dream save for the crisp crackling notes on the table.
ONE:Some makers of steam-hammers have so perfected the automatic class, that they may be instantly changed so as to work with either dead blows or elastic blows at pleasure, thereby combining all the advantages of both principles. This brings the steam-hammer where it is hard to imagine a want of farther improvement.
THREE:A few days later I had to go to Canne, a Belgian hamlet near the frontier, south of Maastricht. In the evening of August 18th an atrociously barbarous crime had been committed there, a cool-blooded murder. At Canne live some good, kind Flemings, who would not hurt a fly. The kind-hearted burgomaster had, moreover, tried for days to comfort his fellow-citizens, and was for ever saying:
TWO:"I did. So you see that she has not escaped from London. Perhaps you knew that before you came here. Anyway I have told you. And I'll tell you more if you are not aware of it already. Leona Lalage and the Spanish gipsy of the Corner House are one and the same woman."
TWO:"it's prusic----" --Page 314It seemed incredible, but there it was, and there it will be again so long as human cupidity and human greed exist. Maitrank was the only man who was silent over his losses. He had been a fool, but the money was gone, and there was no reason why he should betray his folly aloud to the world.
The third plan of boring with bars resting in bearings is more extensively practised, and has the largest range of adaptation. A feature of this plan of boring is that the form of the boring-bar, or any imperfection in its bearings, is communicated to the work; a want of straightness in the bar makes tapering holes. This, of course, applies to cases where a bar is fed through fixed bearings placed at one or both ends of a hole to be bored. If a boring-bar is bent, or out of truth between its bearings, the diameter of the hole being governed by the extreme sweep of the cutters is untrue to the same extent, because as the cutters move along and come nearer to the bearings, the bar runs with more truth, forming a tapering hole diminishing toward the rests or bearings. The same rule applies to some extent in chuck-boring, the form of the lathe spindle being communicated to holes bored; but lathe spindles are presumed to be quite perfect compared with boring bars.I now come to note a matter in connection with draughting to which the attention of learners is earnestly called, and which, if neglected, all else will be useless. I allude to indigestion, and its resultant evils. All sedentary pursuits more or less give rise to this trouble, but none of them so much as draughting. Every condition to promote this derangement exists. When the muscles are at rest, circulation is slow, the mind is intensely occupied, robbing the stomach of its blood and vitality, and, worse than all, the mechanical action of the stomach is usually arrested by leaning over the edge of a board. It is regretted that no good rule can be given to avoid this danger. One who understands the evil may in a degree avert it by applying some of the logic which has been recommended in the study of mechanics. If anything tends to induce indigestion, its opposite tends the other way, and may arrest it; if stooping over a board interferes with the action of the digestive organs, leaning back does the opposite; it is therefore best to have a desk as high as possible, stand when at work, and cultivate a constant habit of straightening up and throwing the shoulders back, and if possible, take brief intervals of vigorous exercise. Like rating the horse-power of a steam-engine, by multiplying the force into the velocity, the capacity of a man can be estimated by multiplying his mental acquirements into his vitality.
荣誉榜
THREE:The subject of Greek philosophy is so vast that, in England at least, it has become customary to deal with it in detached portions rather than as a connected whole. This method has its advantages, but it has also its drawbacks. The critic who singles out some one thinker for special study is apt to exaggerate the importance of his hero and to credit him with the origination of principles which were really borrowed from his predecessors. Moreover, the appearance of a new idea can only be made intelligible by tracing the previous tendencies which it either continues, combines, or contradicts. In a word, the history of philosophy has itself a philosophy which requires that we should go beyond particular phenomena and view them as variously related parts of a single system.As to the proofs of divine agency derived from divination, they are both irrational and weak. If all things are pre153determined by Gods providence, knowledge of the future is useless, and, therefore, cannot have been given to us. Moreover, no confidence can be placed in the alleged fulfilments of prophecy; probably most of them are fictitious and the remainder accidental. For the rest, good luck is distributed without regard to merit; and the general corruption of mankind shows that, from the Stoic point of view, human nature is a complete failure.249
THREE:I stood near the spot where the ferry-boat used to take people across; but to cross was now out of the question, for any one alighting on the opposite side would be landed in the scorching glare. Therefore, I returned to Lixhe, where I might try to cross the river by the pontoon-bridge, and get to Vis along the other bank of the Meuse.CHAPTER VIII. WATER-POWER.
