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When you know that the little wheels are in constant motion, and that the balance wheel, for instance, vibrates eighteen thousand times an hour, it is plain that a vast amount of wear comes upon the spot where the pivots of these wheels rest. No metal can be made smooth enough to prevent friction, and there is no metal hard enough to prevent wear. The "jewels" are smoother and harder.
I have seen staffs that were models as regards execution and finish, that were nearly worthless from a practical standpoint, simply because the maker had devoted all his time and energy to the execution of a beautiful piece of lathe work, and had given no thought or study to the form and size of the pivots.
"No," replied Kennedy firmly. "Miss Nevsky, I am quite willing to take the risk. Besides, here comes the automobile." "You are too kind," she exclaimed. "Kazanovitch himself could do no more. How am I ever to thank you?" On the back of the automobile Kennedy placed a peculiar oblong box, swung on two concentric rings balanced on pivots, like a most delicate compass.
The architect at these points was the power of Nature, and she put the pivots there, to be, as it were, centres, one of them above the earth and sea at the very top of the firmament and even beyond the stars composing the Great Bear, the other on the opposite side under the earth in the regions of the south. In the midst thereof, the earth and sea naturally occupy the central point.
The word cylinder is used in a conventional sense only, since the cavities acting as such are circular, whose axes, instead of being straight lines, are arcs of circles struck from the center at which the axes of the shafts would, if continued, intersect. The four pistons are carried upon the gimbal ring, which connects, by means of pivots, the two chair couplings.
They were scarcely a hundred yards from the shore, when suddenly a sharp fire of musketry was opened from twenty or thirty Dervish rifle-men concealed in the mimosa scrub. The bullets pattered all over the decks, but while many recorded narrow escapes no one was actually hit, and the Maxim guns, revolving quickly on their pivots, took a bloody vengeance for the surprise.
To form parts of the scenes there were prisms of framework, turning upon pivots, upon each face of which was strained a distinct picture, one for tragedy, consisting of large buildings, with columns, statues, and other corresponding ornaments; a second face, with houses, windows, and balconies, for comedy; a third applied to farce, with cottages, grottoes, and rural scenes.
There was indescribable scorn in the last word. The doors of the reception hall had been flung back on noiseless pivots by unseen hands. The banqueting room disclosed within was not so much a room as a garden. Flowers, flowers were everywhere, roses, violets, narcissuses, and a score of others breathing forth a heavy fragrance.
The points of support on the strategic front are called pivots of operations, and are practical temporary bases, but quite different from pivots of maneuver. For example, in 1796 Verona was an excellent pivot of operations for all Napoleon's enterprises about Mantua for eight months. In 1813 Dresden was his pivot.
In the centre was the Jewish tomb-a square building of brick, of a mosque-like form, with a rather elongated dome at the top. The door is in the ancient sepulchral fashion of the country, very small, consisting of a single stone of great thickness, and turning on its own pivots from one side. Its key is always in possession of the eldest of the Jews resident at Hamadan.
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