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His face slowly changed, gradually became red.

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A learner should, in fact, consider the application and operative conditions of gearing as one of the main parts of the subject, and the geometry or even the construction of wheels as subsidiary; in this way attention will be directed to that which is most difficult to learn, and a part for which facilities are frequently wanting. Gearing may be classed into five modificationsspur wheels, bevel wheels, tangent wheels, spiral wheels, and chain wheels; the last I include among gearing because the nature of their operation is analogous to tooth wheels, although at first thought chains seem to correspond more to belts than gearing. The motion imparted by chains meshing over the teeth of wheels is positive, and not frictional as with belts; the speed at which such chains may run, with other conditions, correspond to gearing.That happened each time that he started again, and I was more tired by trying to convince this man than if I had walked all the rest of the way to Brussels. But after all I got there.
ONE:The Countess laughed lightly. Her mood seemed friendly.

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TWO:Dick performed the mechs duties for the pilot in getting the engine started again, then he clambered into his old place. Sandy was already behind their new pilot."You are welcome;" he said; "it is so dull here that even the conversation of a mere detective is pleasing."

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  • FORE:Et merito: nam si certain finem esse viderent

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  • FORE:("Voluntary workmen will be enrolled from August 21st on the left bank of the Meuse, where details of the conditions will be made known.")

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  • FORE:Hetty returned to her room, but not to sleep. The vague shadow of some coming trouble lay upon her. She was young and healthy, and she was engaged to one of the best men on earth. And they were going to be married soon. She ought to have been superlatively happy."What on earth are you talking about?" Charlton asked impatiently.

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  • FORE:We have seen with what freedom Carneades discussed the foundations of morality. It is now evident that in so doing he did not exceed the legitimate functions of criticism. No one at the present day looks on Prof. Bain and Mr. Henry Sidgwick as dangerous teachers because they have made it clear that to pursue the greatest happiness of the greatest number is not always the way to secure a maximum of154 happiness for oneself. The really dangerous method, as we now see, is to foster illusions in early life which subsequent experience must dispel.

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  • FORE:"So am I; I am a Netherlander!"In respect to repairing alone, the consideration of having the parts of machinery fitted to standard sizes is often equal to its whole value.

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  • FORE:"Yes, sir," I replied, "excepting my pocket-knife."

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THREE:Through his glasses Larry saw the hydroplane awaken the sea to a split crest of foam, saw a cascade of moiling water begin to chase her, and knew that the tiny craft was racing out to the meeting.

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THREE:I thought Jeff might be in the ship, yonder, until he nearly threw us out of control with his propeller wash. Then I thoughthe might be he hesitated.

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THREE:"Very well, now give me those papers."

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ONE:Meanwhile, hedonism had been temporarily taken up by Plato, and developed into the earliest known form of utilitarianism. In his Protagoras, he endeavours to show that every virtue has for its object either to secure a greater pleasure by the sacrifice of a lesser pleasure, or to avoid a greater pain by the endurance of a lesser pain; nothing being taken into account but the interests of the individual agent concerned. Plato afterwards discarded the theory sketched in the Protagoras for a higher and more generous, if less distinctly formulated morality; but while ceasing to be a hedonist he remained a utilitarian; that is to say, he insisted on judging actions by their tendency to promote the general welfare, not by the sentiments which they excite in the mind of a conventional spectator.
FORE:

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TWO:She clutched at the handle of her sunshade passionately as a society leader responded to Bruce's uplifted hat by a cold stare.

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99 
TWO:
THREE: THREE:Of Aristotle and his philosophie.But why did he come so far out on Long Island, and then get a dead stick so handy to this old estate that hasnt been lived in for years and that has everybody scared so they wont come near at night? THREE:CHAPTER XVI. MR. CHARLTON SPEAKS.The drone of an incoming airplane took them racing to the landing spot where Jeff came down to report that he had taken the unconscious seaplane pilot to a hospital where it was declared that he had a bad blow on his temple and might not recover his mental clearness for many days.
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Arrived at Riempst I found the pretty village church in its full glory and the vicar engaged in performing his religious functions; the vicar of Sichem was also still at home. The only part of the report that was true was that various burgomasters from the environs had been sent to Tongres and had not returned since. The burgomaster of Riempst, with whom I had been imprisoned already once, was being searched for by the Germans everywhere, but could not be found. In several places I heard also that the Belgians were lying in the woods round about, and that something was being prepared at Riempst; but no one knew what. So I decided to go and inquire.The sudden and varied resistance to line shafts tends to loosen couplings, destroy gearing, and produce sudden strains that are unknown in other cases; and shafting arranged with the usual proportions for transmitting power will soon fail if applied to driving trip-hammers. Rigid connections or metal attachments ace impracticable, and a slipping belt arranged so as to have the tension varied at will is the usual and almost the only successful means of transmitting power to hammers. The motion of trip-hammers is a curious problem; a head and die weighing, together with the irons for attaching them, one hundred pounds, will, with a helve eight feet long, strike from two to three hundred blows a minute. This speed exceeds anything that could be attained by a direct reciprocal motion given to the hammer-head by a crank, and far exceeds any rate of speed that would be assumed from theoretical inference. The hammer-helve being of wood, is elastic, and acts like a vibrating spring, its vibrations keeping in unison with the speed of the tripping points. The whole machine, in fact, must be constructed upon a principle of elasticity throughout, and in this regard stands as an exception to almost every other known machine. The framing for supporting the trunnions, which one without experience would suppose should be very rigid and solid, is found to answer best when composed of timber, and still better when this timber is laid up in a manner that allows the structure to spring and [107] yield. Starting at the dies, and following back through the details of a trip-hammer to the driving power, the apprentice may note how many parts contribute to this principle of elasticity: Firstthe wooden helve, both in front of and behind the trunnion; nextthe trunnion bar, which is usually a flat section mounted on pivot points; thirdthe elasticity of the framing called the 'husk,' and finally the frictional belt. This will convey an idea of the elasticity required in connecting the hammer-head with the driving power, a matter to be borne in mind, as it will be again referred to.Maitrank hesitated a moment and nodded.As a means for transmitting power, shafts afford the very important advantage that power can be easily taken off at any point throughout their length, by means of pulleys or gearing, also in forming a positive connection between the motive-power and machines, or between the different parts of machines. The capacity of shafts in resisting torsional strain is as [46] the cube of their diameter, and the amount of torsional deflection in shafts is as their length. The torsional capacity being based upon the diameter, often leads to the construction of what may be termed diminishing shafts, lines in which the diameter of the several sections are diminished as the distance from the driving power increases, and as the duty to be performed becomes less. This plan of arranging line shafting has been and is yet quite common, but certainly was never arrived at by careful observation. Almost every plan of construction has both advantages and disadvantages, and the best means of determining the excess of either, in any case, is to first arrive at all the conditions as near as possible, then form a "trial balance," putting the advantages on one side and the disadvantages on the other, and footing up the sums for comparison. Dealing with this matter of shafts of uniform diameter and shafts of varying diameter in this way, there may be found in favour of the latter plan a little saving of material and a slight reduction of friction as advantages. The saving of material relates only to first cost, because the expense of fitting is greater in constructing shafts when the diameters of the different pieces vary; the friction, considering that the same velocity throughout must be assumed, is scarcely worth estimating.
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