Author Description

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. 1813 Excerpt:...of the pile, a great part of its moving force is expended in bruising the pile, and the progress of the pile into the earth is very small. The heavier the ram is in proportion to the pile, the greater is the progress of the pile, by the application of the same quantity of moving force.--On the other hand, if the object be to produce a change of figure in the substance which is struck, in hammering iron for example, if the anvil be light in proportion to the hammer, the intended effect is not produced ia the same degree as when the anvil, or the mass which is struck, is heavy in proportion to the hammer which strikes it. If a non-elastic body strike a non-elastic Av 1 A 1:hence it appears that the fractional part of the moting force found in the motion of the bodies after collision is. consequently the part which is spent in prodocing change of 6gure is Examples of moving force similar to these are referred to by Mr. Leslie, in his excellent work on heat, p. 128. He explains them however on different principles. machine moving with a uniform velocity (such as the float of an undershot water-wheel) the maximum effect of moving force will be communicated to the wheel when the part of it which is struck moves with half the velocity of the body which strikes it. Let A (fig. 17) be a non-elastic soft mass, uniformly penetrable by the cylinder c, and moving in the direction AB with such a velocity v that it would be brought to rest by driving the cylinder up to F against an immoveable obstacle--If instead of an immoveable obstacle, we suppose B to be the float of a water-wheel moving with an uniform velocity = §«, and to be struck by c at F; in that case when B has moved through a space FH = fEF, A will have arrived at G, EG being =.EF, and will have los...