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FORE:FORE: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."We'll sit in the hall," said Lawrence. "We'll take it for granted that the owner is a hospitable man, and permit ourselves the luxury of tobacco."FORE:"Perhaps we could get it now." Hetty smiled.FORE:I had wished to publish this book a long time ago, because I think it my duty to submit to the opinion of the public the things which I witnessed in the unfortunate land of the Belgians, and where I was present at such important events as an impartial spectator. I call myself an impartial spectator, for if this book be anti-German, it should not be forgotten that the facts give it that tendency.CHAPTER I. EARLY GREEK THOUGHT.
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FORE:[92]FORE:Besides the encouragement which it gave to kind offices between friends and neighbours, the Stoic doctrine of humanity and mutual love was honourably exemplified in Senecas emphatic condemnation of the gladiatorial games and of the40 horrible abuses connected with domestic slavery in Rome.86 But we miss a clear perception that such abuses are always and everywhere the consequences of slavery; and the outspoken abolitionism of the naturalists alluded to by Aristotle does not seem to have been imitated by their successors in later ages.87 The most one can say is that the fiction of original liberty was imported into Roman jurisprudence through the agency of Stoic lawyers, and helped to familiarise mens minds with the idea of universal emancipation before political and economical conditions permitted it to be made a reality.
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