This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1869 Excerpt: ...may be the weight of the impinging body or the
velocity of the impact, a certain finite amount of work U2 is
yielded upon the resistances opposed to the motion of the wedge;
there is in every such case a certain mean resistance K overcome
through a certain space S, in the direction in which that
resistance acts, which resistance and space are such, that If
therefore the space S be exceedingly small as compared with TJ2,
there will be an exceedingly great resistance R overcome by the
impact through that small space, however slight the impact. From
this fact the enormous amount of the resistances which the wedge,
when struck by the hammer, is made to overcome, is accounted for.
The power of thus subduing enormous resistances by impact is not
however peculiar to the wedge, it is common to all implements of
impact, and belongs to its nature; its effects are rendered
permanent in the wedge by the property possessed by that implement
of retaining permanently any position into which it is driven
between two resisting surfaces, and thereby opposing itself
effectually to the tendency of those surfaces, by reason of their
elasticity, to recover their original form and position. It is
equally true of any the slightest direct impact of the hammer as of
its impact applied through the wedge, that it is sufficient to
cause any finite resistance opposed to it to yield through a
certain finite space, however great that resistance may be. The
difference lies in this, that the surface yielding through this
exceedingly small but finite space under the blow of the hammer,
immediately recovers itself after the blow if the limits of
elasticity be not passed; whereas the space which the wedge is, by
such an impact, made to traverse, in the direction of its length,
becomes a perman...
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