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TWO: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 offer the best Services in our Restarant.
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TWO:CHAPTER XIV. "CROWNER'S QUEST."To keep the big swindle going on and to avoid awkward mistakes it was necessary for the confederates to meet at intervals. By small purchases at one address or another Prout had pretty well got to know all the gang by sight, and by following one or another he discovered at last where the rendezvous was--a public-house of not too good repute in White Lane, leading off Oxford Street.We offer the best Services in our Restarant.
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TWO:"I would for one," Bruce laughed. "I am not fond of your tempestuous woman. Have there been any other signs and manifestations?"I observed then already that much poverty prevailed, for in many places I noticed people whose appearance did not suggest that they were accustomed to that sort of work, creeping quietly in and out of hedges, carrying bags in which they put the potatoes picked up in the fields. Naturally they started and looked alarmed, when, suddenly, I passed on my bicycle.We offer the best Services in our Restarant.
