THREE: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.
FORE:One of the problems connected with the handling of material is to determine where hand-power should stop and motive-power beginwhat conditions will justify the erection of cranes, hoists, or tramways, and what conditions will not. Frequent mistakes are made in the application of power when it is not required, especially for handling material; the too common tendency of the present day being to apply power to every purpose where it is possible, without estimating the actual saving that, may be effected. A common impression is that motive power, wherever applied to supplant hand labour in handling material, produces a gain; but in many cases the [66] fallacy of this will be apparent, when all the conditions are taken into account."2. That all who are in possession of any arms, of whatever description, or any munition must at once deliver everything at the town-hall.
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In sit amet sapien eros. Integer in tincidunt velit. Ut sapien est, molestie
sit amet metus sit amet, malesuada gravida ex. In hac habitasse platea
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id Praesent lacinia tempor nisi, id rhoncus nisi scelerisque id. I
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FORE:
In sit amet sapien eros. Integer in tincidunt velit. Ut sapien est,
molestie sit amet metussit amet, malesuada gravida ex. In hac habita
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FORE:In practice this difference of effect on the top and bottom, or between the anvil and hammer sides of a piece, is much greater than would be supposed. The yielding of the soft metal on the top cushions the blow and protects the under side from the force. The effect produced by a blow struck upon hot iron cannot be estimated by the force of the blow; it requires, to use a technical term, a certain amount of force to "start" the iron, and anything less than this force has but little effect in moving the particles and changing the form of a piece.
In sit amet sapien eros. Integer in tincidunt velit. Ut sapien est,
molestie sit amet metussit amet, malesuada gravida ex. In hac habita
sse platea dictumst. Aliquam iaculis feugiat
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FORE:
In sit amet sapien eros. Integer in tincidunt velit. Ut sapien est,
molestie sit amet metussit amet, malesuada gravida ex. In hac habita
sse platea dictumst. Aliquam iaculis feugiat
Read more